Internet Engineering Task Force L. Zhou Internet-Draft N. Kong Intended status: Informational S. Shen Expires: October 3, 2013 CNNIC S. Sheng ICANN Apr 2013 Domain Name Registration Data Access Protocol Object Inventory Analysis draft-ietf-weirds-object-inventory-00 Abstract WHOIS output elements from 124 TLDs were collected and analyzed. This document describes the statistical analysis process and result of WHOIS information. The purpose of this document is to build an object inventory to facilitate discussions of domain name data objects in WHOIS response. Status of this Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on October 3, 2013. Copyright Notice Copyright (c) 2013 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must Zhou, et al. Expires October 3, 2013 [Page 1] Internet-Draft DNRD Object Inventory Apr 2013 include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. This document may contain material from IETF Documents or IETF Contributions published or made publicly available before November 10, 2008. The person(s) controlling the copyright in some of this material may not have granted the IETF Trust the right to allow modifications of such material outside the IETF Standards Process. Without obtaining an adequate license from the person(s) controlling the copyright in such materials, this document may not be modified outside the IETF Standards Process, and derivative works of it may not be created outside the IETF Standards Process, except to format it for publication as an RFC or to translate it into languages other than English. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Methodology . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4 4. Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . 5 4.2. Public Objects . . . . . . . . . . . . . . . . . . . . . . 5 4.2.1. WHOIS Data of Domain . . . . . . . . . . . . . . . . . 5 4.2.2. WHOIS Data of Contact . . . . . . . . . . . . . . . . 6 4.2.2.1. Registrant . . . . . . . . . . . . . . . . . . . . 6 4.2.2.2. Admin Contact . . . . . . . . . . . . . . . . . . 6 4.2.2.3. Tech Contact . . . . . . . . . . . . . . . . . . . 7 4.2.2.4. Billing Contact . . . . . . . . . . . . . . . . . 8 4.2.3. WHOIS Data of Nameserver . . . . . . . . . . . . . . . 8 4.2.4. WHOIS Data of Registrar . . . . . . . . . . . . . . . 9 4.3. Other Objects . . . . . . . . . . . . . . . . . . . . . . 9 5. Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5.1. Preleminary Statistics . . . . . . . . . . . . . . . . . . 11 5.2. Data Elements Analysis . . . . . . . . . . . . . . . . . . 13 5.3. Labels Analysis . . . . . . . . . . . . . . . . . . . . . 14 5.4. Other Objects Analysis . . . . . . . . . . . . . . . . . . 15 6. Limitation . . . . . . . . . . . . . . . . . . . . . . . . . . 15 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 16 8. Security considerations . . . . . . . . . . . . . . . . . . . 16 9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 16 10. Normative References . . . . . . . . . . . . . . . . . . . . . 16 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 17 Zhou, et al. Expires October 3, 2013 [Page 2] Internet-Draft DNRD Object Inventory Apr 2013 1. Introduction Internet registries for both number resources and names have historically maintained a lookup service to permit public access to some portion of the registry database. Most registries offer the service via the WHOIS protocol [RFC3912], with additional services being offered via world wide web pages, bulk downloads, and other services, such as RPSL [RFC2622]. Although the WHOIS protocol specified in [RFC3912] is widely adopted and supported, it has several shortcomings that limits its usefulness to the evolving needs of the Internet community. For example, the WHOIS protocol has not been Internationalized, it does not consistently support Internationalized Domain Name (IDN, described in [RFC5890]); WHOIS has no query and response format; and WHOIS protocol does not support user authentication, access control for differentiated access. This document is aimed to build an object inventory to facilitate discussions of domain name data objects in WHOIS response. Based on this statistics result, it may help to form and specify the response format. In domain name space, there are now over 200 ccTLDs and 21 gTLDs. Different domain name registries may have different WHOIS response objects and formats. A common understanding of domain name data format is critical. This document describes the WHOIS data collection procedures and gives a data object inventory analysis based on the collected data from 106 ccTLDs and 18 gTLDs. The statistics result includes port 43 response data and web response data. All the data objects are classified into domain, contact, nameserver and registrar related objects. Other objects that do not belong to above four categories are viewed as private designed objects. Since this is a document with statistics analysis and there are no protocol specifications, the [RFC2119] language does not apply. 2. Methodology WHOIS information, including port 43 response and web response data, is collected following the procedures descibed below. Zhou, et al. Expires October 3, 2013 [Page 3] Internet-Draft DNRD Object Inventory Apr 2013 (1) A programming script is applied to collect port 43 response data from 294 ccTLDs. "nic.ccTLD" is used as the query string which is usually registered in a domain registry. Responses of 106 ccTLDs were received. 18 gTLDs' port 43 response data is collected from their contracts with ICANN. So the sample size of port 43 WHOIS response data is 124 registries in total. (2) WHOIS data from web is collected manually from the 124 registries that have port 43 WHOIS responses. (3) Some of the responses which are collected by program may not seem to be correct. So data of top 10 ccTLD registries, like .de, .eu and .uk etc., was re-verified by querying domain names other than "nic.ccTLD". (4) In accordance with the specification 4 of new gTLD applicant guide book, [RFC5730], [RFC5731], [RFC5732] and [RFC5733], the response data objects are classified into public and other data objects. Public data objects are those which are defined in the above two documents. Other objects are those which are self designed data elements or objects in different registries. (5) Data elements with the same meaning, but using different labels, are grouped together. The numbers of registries that support the data elements is calculated in the total count column. 3. Terminology o Data element -- The name of specific response object. o Label -- Different registries may have different naming ways for the same data element. So there may be several labels with the same meaning and belong to one group of data element. o Most popular label -- The label which is most supported by the registries. o Number of labels -- The number of different labels. o Total count -- The number of registries that support a certain data element. 4. Analysis Zhou, et al. Expires October 3, 2013 [Page 4] Internet-Draft DNRD Object Inventory Apr 2013 4.1. Overview WHOIS data is collected from 124 registries, including 106 ccTLDs and 18 gTLDs. All the 124 registries support domain query. Among 124 registries, 8 ccTLDs and 15 gTLDs support contact query. 10 ccTLDs and 18 gTLDs support name server query. 4 ccTLDs and 18 gTLDs support registrar query. Domain WHOIS data contains 68 data elements that use a total of 550 labels. There are total 392 other objects for Domain WHOIS data. The raw data can be accessed with the following link: WHOIS Statistcs Data File [Stat-Data-File] 4.2. Public Objects As mentioned above, public objects are those data elements selected according to new gTLD application guide book, [RFC5730], [RFC5731], [RFC5732] and [RFC5733]. They are generally classified into four categories: domain, contact, nameserver and registrar related information. 4.2.1. WHOIS Data of Domain WHOIS data of domain includes "Domain Name", "Creation Date", "Domain Status", "Expiration Date", "Updated Date", "Domain ID", "DNSSEC" and "Last Transferred Date". The following table gives the element name, most popular label and corresponding numbers of TLDs and labels. +-------------------+-------------------+------------+--------------+ | Data Element | Most Popular | No. of | No. of | | | Label | TLDs | Labels | +-------------------+-------------------+------------+--------------+ | Domain Name | Domain Name | 118 | 6 | | Creation Date | Created | 106 | 24 | | Domain Status | Status | 95 | 8 | | Expiration Date | Expiration Date | 81 | 21 | | Updated Date | Modified | 70 | 20 | | Domain ID | Domain ID | 34 | 5 | | DNSSEC | DNSSEC | 14 | 4 | | Last Transferred | Last Transferred | 4 | 3 | | Date | Date | | | +-------------------+-------------------+------------+--------------+ WHOIS Data of Domain Analyzing the above data, about 95.16% of the 124 registries support "Domain Name" data element; 85.48% of the 124 registries support "Creation Date" data element; 76.61% of the 124 registries support "Domain Status" data element. On the other hand, some elements such as "DNSSEC" and "Last Transferred Date" are only supported by 11.29% Zhou, et al. Expires October 3, 2013 [Page 5] Internet-Draft DNRD Object Inventory Apr 2013 and 3.23% of all the registries seperatedly. 4.2.2. WHOIS Data of Contact In domain name space, contacts are typically devided into registrant, administrative contact, technical contact and billing contact. 4.2.2.1. Registrant The following table shows all the contact information of registrant. 14 data elements are listed below. +--------------------+---------------------+-----------+------------+ | Data Element | Most Popular Label | No. of | No. of | | | | TLDs | Labels | +--------------------+---------------------+-----------+------------+ | Registrant Name | Name | 65 | 7 | | Registrant Email | Registrant Email | 59 | 7 | | Registrant ID | Registrant ID | 50 | 12 | | Registrant Phone | Registrant Phone | 48 | 6 | | Registrant Fax | Registrant Fax | 44 | 6 | | Registrant | Registrant | 42 | 4 | | Organization | Organization | | | | Registrant Country | Country | 42 | 6 | | Code | | | | | Registrant City | Registrant City | 38 | 4 | | Registrant Postal | Registrant Postal | 37 | 5 | | Code | Code | | | | Registrant | Registrant | 32 | 4 | | State/Province | State/Province | | | | Registrant Street | Registrant Street1 | 31 | 16 | | Registrant Country | Registrant Country | 19 | 4 | | Registrant Phone | Registrant Phone | 18 | 2 | | Ext. | Ext. | | | | Registrant Fax Ext | Registrant Fax Ext | 17 | 2 | +--------------------+---------------------+-----------+------------+ Registrant Among all the data elements, "Registrant Name", "Registrant Email" and "Registrant ID" are the top 3 data elements. 4.2.2.2. Admin Contact The following table shows all the contact information of administrative contact. 14 data elements are lsted below. Zhou, et al. Expires October 3, 2013 [Page 6] Internet-Draft DNRD Object Inventory Apr 2013 +--------------------+--------------------+-----------+-------------+ | Data Element | Most Popular Label | No. of | No. of | | | | TLDs | Labels | +--------------------+--------------------+-----------+-------------+ | Admin Street | Address | 64 | 19 | | Admin Name | Admin Name | 60 | 9 | | Admin Email | Admin Email | 54 | 12 | | Admin ID | Admin ID | 52 | 16 | | Admin Fax | Admin Fax | 44 | 8 | | Admin Phone | Admin Phone | 43 | 9 | | Admin Organization | Admin Organization | 42 | 9 | | Admin Country Code | Country | 42 | 7 | | Admin City | Admin City | 35 | 5 | | Admin Postal Code | Admin Postal Code | 35 | 7 | | Admin | Admin | 28 | 5 | | State/Province | State/Province | | | | Admin Country | Admin Country | 17 | 5 | | Admin Phone Ext. | Admin Phone Ext. | 17 | 3 | | Admin Fax Ext. | Admin Fax Ext. | 17 | 3 | +--------------------+--------------------+-----------+-------------+ Admin Contact Among all the data elements, "Admin Street", "Admin Name" and "Admin Email" are the top 3 data elements. 4.2.2.3. Tech Contact The following table shows all the information about domain name technical contact. 14 data elements are listed below. +--------------------+--------------------+-----------+-------------+ | Data Element | Most Popular Label | No. of | No. of | | | | TLDs | Labels | +--------------------+--------------------+-----------+-------------+ | Tech Email | Tech Email | 59 | 9 | | Tech ID | Tech ID | 55 | 16 | | Tech Name | Tech Name | 47 | 6 | | Tech Fax | Tech Fax | 45 | 9 | | Tech Phone | Tech Phone | 45 | 10 | | Tech Country Code | Country | 43 | 9 | | Tech Organization | Tech Organization | 39 | 7 | | Tech City | Tech City | 36 | 4 | | Tech Postal Code | Tech Postal Code | 36 | 7 | | Tech | Tech | 30 | 4 | | State/Province | State/Province | | | | Tech Street | Tech Street1 | 27 | 16 | | Tech Country | Tech Country | 18 | 5 | Zhou, et al. Expires October 3, 2013 [Page 7] Internet-Draft DNRD Object Inventory Apr 2013 | Tech Fax Ext | Tech Fax Ext | 18 | 3 | | Tech Phone Ext. | Tech Phone Ext. | 13 | 3 | +--------------------+--------------------+-----------+-------------+ Tech Contact Among all the data elements, "Tech Email", "Tech ID" and "Tech Name" are the top 3 data elements. 4.2.2.4. Billing Contact The following table shows all the information about domain name billing contact. 14 data elements are listed below. +--------------------+--------------------+-----------+-------------+ | Data Element | Most Popular Label | No. of | No. of | | | | TLDs | Labels | +--------------------+--------------------+-----------+-------------+ | Billing Name | Name | 47 | 5 | | Billing Fax | Fax | 43 | 6 | | Billing Email | Email Address | 42 | 7 | | Billing Country | Country | 38 | 4 | | Code | | | | | Billing Phone | Phone Number | 34 | 6 | | Billing ID | Billing ID | 28 | 9 | | Billing City | Billing City | 28 | 4 | | Billing | Billing | 28 | 5 | | Organization | Organization | | | | Billing Postal | Billing Postal | 27 | 4 | | Code | Code | | | | Billing | Billing | 21 | 4 | | State/Province | State/Province | | | | Billing Street | Billing Street1 | 19 | 13 | | Billing Country | Billing Country | 13 | 5 | | Billing Phone Ext. | Billing Phone Ext. | 10 | 2 | | Billing Fax Ext | Billing Fax Ext | 10 | 2 | +--------------------+--------------------+-----------+-------------+ Billing Contact Among all the data elements, "Billing Name", "Tech Fax" and "Billing Email" are the top 3 data elements. 4.2.3. WHOIS Data of Nameserver 114 registries (about 92% of all the 124 registries) have the nameserver data element in their WHOIS response. But there are 63 different labels for this element. Top 3 labels for this element are Zhou, et al. Expires October 3, 2013 [Page 8] Internet-Draft DNRD Object Inventory Apr 2013 Name Server which is supported by 25% of all the registries, Name Servers which is supported by 16% of all the registries and nserver which is supported by 12% of all the registries. +--------------+--------------------+-------------+---------------+ | Data Element | Most Popular Label | No. of TLDs | No. of Labels | +--------------+--------------------+-------------+---------------+ | NameServer | NameServer | 114 | 63 | +--------------+--------------------+-------------+---------------+ WHOIS Data of Nameserver Some registries have nameserver elements such like "nameserver 1", "nameserver 2" till "nameserver n". So there are more labels than of other data elements. 4.2.4. WHOIS Data of Registrar There are three data elements about registrar information. +-------------------+---------------------+-----------+-------------+ | Data Element | Most Popular Label | No. of | No. of | | | | TLDs | Labels | +-------------------+---------------------+-----------+-------------+ | Sponsoring | Registrar | 84 | 6 | | Registrar | | | | | Created by | Created by | 14 | 3 | | Registrar | | | | | Updated by | Last Updated by | 11 | 3 | | Registrar | Registrar | | | +-------------------+---------------------+-----------+-------------+ WHOIS Data of Registrar 67.7% of the registries have sponsoring regitrar data element. Elements such as "Created by Registrar" and "Updated by Registrar" are supported by 11.3% and 8.9% of the registries. 4.3. Other Objects So called other objects are those data elements that are self- designed or are difficult to be classified. There are 392 other objects altogether. The following tables lists the top 50 other objects according to the data collection result. Zhou, et al. Expires October 3, 2013 [Page 9] Internet-Draft DNRD Object Inventory Apr 2013 +---------------------------------------+-------------+ | Data Element | No. of TLDs | +---------------------------------------+-------------+ | Registrant | 41 | | Phone | 32 | | Technical contact | 26 | | Administrative contact | 15 | | source | 14 | | fax-no | 13 | | nic-hdl | 13 | | Billing Contact | 12 | | referral url | 11 | | e-mail | 10 | | WHOIS server | 9 | | Admin Contact | 9 | | Type | 9 | | Website | 9 | | zone-c | 8 | | remarks | 7 | | Registration URL | 6 | | anonymous | 6 | | anniversary | 6 | | hold | 6 | | nsl-id | 6 | | obsoleted | 6 | | Customer Service Contact | 5 | | Customer Service Email | 4 | | Registrar ID | 4 | | org | 4 | | person | 4 | | Maintainer | 4 | | Nombre | 3 | | Sponsoring Registrar IANA ID | 3 | | Trademark Number | 3 | | Trademark Country | 3 | | descr | 3 | | url | 3 | | Postal address | 3 | | Registrar URL | 3 | | International Name | 3 | | International Address | 3 | | Admin Contacts | 2 | | Contractual Language | 2 | | Date Trademark Registered | 2 | | Date Trademark Applied For | 2 | | IP Address | 2 | | Keys | 2 | | Language | 2 | Zhou, et al. Expires October 3, 2013 [Page 10] Internet-Draft DNRD Object Inventory Apr 2013 | NIC handle | 2 | | Record maintained by | 2 | | Registration Service Provider | 2 | | Registration Service Provided By | 2 | | Registrar URL (registration services) | 2 | +---------------------------------------+-------------+ Top 50 Other Objects Some elements like "Registrant" are difficult to be classified into any categories. A few registries have two levels of data elements, for example: Registrant: Name: Email: ... We do not think the first level of elements belong to any part. So they are put into the scope of other objects. Some other data elements, like "Remarks", "anniversary" and "Customer service Contact" etc., are designed particularly for their own purpose by different registries. 5. Conclusion 5.1. Preleminary Statistics Some preliminary statistics conclusion could be drawn from the raw data. o All of the 124 domain registries have the oject names in their responses although they are in various fomats. o Of the 118 whois services contacted, 65 registries show their registrant contact. About half of the registries (60 registries) support admin contact information. There are 47 registries, that is about one third of the total number, have technical and billing contact information. And only 7 of all the 124 registries give their abuse email in remarks part. No explicite abuse contact information is provided. The o There are mainly two presentation formats. One is key:value, the other is data block format. Example of key-value format: Zhou, et al. Expires October 3, 2013 [Page 11] Internet-Draft DNRD Object Inventory Apr 2013 Domain Information Query: na-nic.com.na Status: Delegated Created: 17 Apr 2004 Modified: 14 Nov 2010 Expires: 31 Dec 9999 Name Servers: oshikoko.omadhina.net ns1.na.afrisp.net ns2.na.afrisp.net ... Example of data block format: Zhou, et al. Expires October 3, 2013 [Page 12] Internet-Draft DNRD Object Inventory Apr 2013 Whois database domain nic.vg Domain Name nic.vg Registered 1998-09-02 Expiry 2012-09-02 Resource Records a 195.153.6.27 mx 10 terpsichore.william.org www a 195.153.6.27 Contact details Registrant, Technical Contact, Billing Contact, Admin. Contact AdamsNames Reserved Domains (i) These domains are not available for registration United Kingdom Identifier: neams048s Servidor Whois de NIC-Venezuela (.VE) Este servidor contiene informacion autoritativa exclusivamente de dominios .VE Cualquier consulta sobre este servicio, puede hacerla al correo electronico whois@nic.ve Titular: Jhonny Valera (nic.ve-dom) jhovalera@conatel.gob.ve Comision Nacional de Telecomunicaciones Av. Veracruz con calle Cali, Edif Aguila, Urb. Las Mercedes Caracas, Distrito Capital VE 0212-9090493 (FAX) +582127718599 o 11 registries give local script responses. The WHOIS information of other registries are all represented in English. 5.2. Data Elements Analysis Top 10 data elements are as follows: Zhou, et al. Expires October 3, 2013 [Page 13] Internet-Draft DNRD Object Inventory Apr 2013 +----------------------+-------------+ | Data Element | No. of TLDs | +----------------------+-------------+ | Domain Name | 118 | | Name Server | 114 | | Creation Date | 106 | | Domain Status | 95 | | Sponsoring Registrar | 84 | | Expiration Date | 81 | | Updated Date | 70 | | Registrant Name | 65 | | Admin Street | 64 | | Admin Name | 60 | +----------------------+-------------+ Top 10 Data Elements Most of the domain related WHOIS information is included in the top 10 data elements. Other information like name server and registrar name are also supported by most registries. We did a cumulative distribution analysis of all the data elements. (1) About 5% of data elements are supported by over 111 (90%) registries. (2) About 30% of data elements are supported by over 44 (35%) registries. (3) About 60% of data elements are supported by over 32 (26%) registries. (4) About 90% of data elements are supported by over 14 (11%) registries. From the above result, we can conclude that only a few registries support all the public objects, most of the registries support just parts of all the objects. 5.3. Labels Analysis The top 10 labels of different data elements include: Zhou, et al. Expires October 3, 2013 [Page 14] Internet-Draft DNRD Object Inventory Apr 2013 +-------------------+---------------+ | Labels | No. of Labels | +-------------------+---------------+ | Name Server | 63 | | Creation Date | 24 | | Expiration Date | 21 | | Updated Date | 20 | | Admin Street | 19 | | Tech ID | 18 | | Registrant Street | 16 | | Admin ID | 16 | | Tech Street | 16 | | Billing Street | 13 | +-------------------+---------------+ Top 10 Labels As explained above, name server label is a unique example that many registries define the name server elements from "nameserver 1" till "nameserver n". So label numbers of name server are much more than other elements. Other elements about date, street name have more labels. A cumulative distribution analysis of label numbers was done. About 90% of data elements have more than 2 Labels. So it is very necessary to specify a standard and unified format for object names of WHOIS response. 5.4. Other Objects Analysis According to statistics result, there are 392 other data objects in total that are not easy to be classsified or privately owned by various registries. Top 50 other objects are listed in the table in section 4.3. You can find that various different objects are designed for some particular purpose. So in order to ensure uniqueness of JSON names used in the Restful Whois service, establishing an IANA registry is a necessary requirement. 6. Limitation o The input "nic.ccTLD" maybe is not a good choice. o The classification of local script data elements may not be accurate. 11 registries give local script responses. o The extension data elements are used randomly by different registries. It is difficult to do statistical analysis. Zhou, et al. Expires October 3, 2013 [Page 15] Internet-Draft DNRD Object Inventory Apr 2013 o Sample sizes of contact, name server and registrar queries are small. * We only use "Whois contactID/nameserver/registrar" as the query commands to check. * Some registries may not support contact, name server or registrar queries. * Some may not support query contact by ID. * Contact information of some registries may be protected. 7. IANA Considerations This document does not specify any IANA actions. 8. Security considerations This document does not does not provide any other security services or introduce any additional considerations. 9. Acknowledgements This document has been reviewed and improved by the design team. The authors especially thank the following individuals who gave their suggestions and contributions to this document: Guangqing Deng, Frederico A C Neves and Ray Bellis. 10. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC2622] Alaettinoglu, C., Villamizar, C., Gerich, E., Kessens, D., Meyer, D., Bates, T., Karrenberg, D., and M. Terpstra, "Routing Policy Specification Language (RPSL)", RFC 2622, June 1999. [RFC3912] Daigle, L., "WHOIS Protocol Specification", RFC 3912, September 2004. [RFC5730] Hollenbeck, S., "Extensible Provisioning Protocol (EPP)", STD 69, RFC 5730, August 2009. Zhou, et al. Expires October 3, 2013 [Page 16] Internet-Draft DNRD Object Inventory Apr 2013 [RFC5731] Hollenbeck, S., "Extensible Provisioning Protocol (EPP) Domain Name Mapping", STD 69, RFC 5731, August 2009. [RFC5732] Hollenbeck, S., "Extensible Provisioning Protocol (EPP) Host Mapping", STD 69, RFC 5732, August 2009. [RFC5733] Hollenbeck, S., "Extensible Provisioning Protocol (EPP) Contact Mapping", STD 69, RFC 5733, August 2009. [RFC5890] Klensin, J., "Internationalized Domain Names for Applications (IDNA): Definitions and Document Framework", RFC 5890, August 2010. [Stat-Data-File] Kong, N., Zhou, L., and G. Deng, "WHOIS Statistics Data File", July 2012, . Authors' Addresses Linlin Zhou CNNIC 4 South 4th Street, Zhongguancun, Haidian District Beijing, Beijing 100190 China Phone: +86 10 5881 2677 Email: zhoulinlin@cnnic.cn Ning Kong CNNIC 4 South 4th Street, Zhongguancun, Haidian District Beijing, Beijing 100190 China Phone: +86 10 5881 3147 Email: nkong@cnnic.cn Zhou, et al. Expires October 3, 2013 [Page 17] Internet-Draft DNRD Object Inventory Apr 2013 Sean Shen CNNIC 4 South 4th Street, Zhongguancun, Haidian District Beijing, Beijing 100190 China Phone: +86 10 5881 3038 Email: shenshuo@cnnic.cn Steve Sheng ICANN 4676 Admiralty Way, Suite 330 Marina del Rey, CA 90292 United States of America Phone: +1.310.823.9358 Email: steve.sheng@icann.org Zhou, et al. Expires October 3, 2013 [Page 18]