Network Working Group J. Levine Internet-Draft Taughannock Networks Intended status: Informational P. Hoffman Expires: March 21, 2014 Cybersecurity Association September 17, 2013 Top-Level Domains that Are Already Dotless draft-hoffine-already-dotless-04 Abstract Recent statements from the Internet Architecture Board and ICANN's Security and Stability Advisory Committee have discussed the problems that the DNS is likely to experience with top-level domains that have address records in them (so-called "dotless domains"). However, these statements spoke of the problem mostly as theoretical, when in fact there are such TLDs today. This document lists the current dotless TLDs, and gives a script for finding them. This document lists data about dotless TLDs, but does not address the policy and technology issues other than to point to the statements of others. 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 March 21, 2014. 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 Levine & Hoffman Expires March 21, 2014 [Page 1] Internet-Draft Already-Dotless TLDs September 2013 carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must 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. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Current Dotless Domains . . . . . . . . . . . . . . . . . . . 3 2.1. TLDs with A Records . . . . . . . . . . . . . . . . . . . 3 2.2. TLDs with AAAA Records . . . . . . . . . . . . . . . . . 3 2.3. TLDs with MX Records . . . . . . . . . . . . . . . . . . 3 3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4 4. Security Considerations . . . . . . . . . . . . . . . . . . . 4 5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4 6. Informative References . . . . . . . . . . . . . . . . . . . 5 Appendix A. Script for Finding Dotless Domains . . . . . . . . . 5 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6 1. Introduction In the past few years, well-respected groups have issued documents about top-level domains in the DNS that have address records in them (so-called "dotless domains"). The Security and Stability Advisory Committee (SSAC) of the Internet Corporation for Assigned Names and Numbers (ICANN) issued a report called "Report on Dotless Domains" in February, 2012 [SAC053]. The Internet Architecture Board (IAB) issued a statement called "Dotless Domains Considered Harmful" [IAB-DOTLESS] in July, 2013. The New gTLD Program Committee of the ICANN Board of Directors (NGPC) approved a resolution on dotless domains [NGPC-DOTLESS] in August, 2013. (The authors of this document note that they are on none of the SSAC, the IAB, nor the ICANN Board.) All of these documents consider the effects of dotless domains without describing the extent of their current deployment. In order to help researchers determine the extent of the problems with dotless domains, this document lists the known dotless domains at the time of publication, and shows how researchers can find them in the future. In this document, we consider any TLD with an A, AAAA, and/or MX record at the apex to be dotless. This document is meant to provide current data to the Internet community, but does not give advice. Many people have expressed a belief that ICANN prohibits all TLDs from being dotless. That belief is not true; ICANN's policies apply only to their contracted TLDs. This document shows the extent to which dotless domains exist today. Levine & Hoffman Expires March 21, 2014 [Page 2] Internet-Draft Already-Dotless TLDs September 2013 2. Current Dotless Domains The following shows the data found on September 3, 2013. The authors note that the data was fairly constant for many months, with very few additions or deletions or records. We checked every TLD in the root zone to see which ones had A, AAAA, or MX records. We found that about 5% of the TLDs did, and all of the TLDs that do are two letter TLDs (which are also known as ccTLDs). 2.1. TLDs with A Records At the time this document is published, the following TLDs have A records. AC has address 193.223.78.210 AI has address 209.59.119.34 CM has address 195.24.205.60 DK has address 193.163.102.24 GG has address 87.117.196.80 IO has address 193.223.78.212 je has address 87.117.196.80 KH has address 203.223.32.21 PN has address 80.68.93.100 SH has address 193.223.78.211 TK has address 217.119.57.22 TM has address 193.223.78.213 TO has address 216.74.32.107 UZ has address 91.212.89.8 VI has address 193.0.0.198 WS has address 64.70.19.33 2.2. TLDs with AAAA Records At the time this document is published, the following TLD has an AAAA record. DK has IPv6 address 2a01:630:0:40:b1a:b1a:2011:1 2.3. TLDs with MX Records At the time this document is published, the following TLDs have MX records. The SSAC report implies, but does not explicitly say, that MX records would cause a TLD to be considered dotless; the IAB report does not mention MX records at all. Levine & Hoffman Expires March 21, 2014 [Page 3] Internet-Draft Already-Dotless TLDs September 2013 AI mail is handled by 10 mail.offshore.AI. AX mail is handled by 5 mail.aland.net. CF mail is handled by 0 mail.intnet.CF. DM mail is handled by 10 mail.nic.DM. GP mail is handled by 10 ns1.worldsatelliteservices.com. GP mail is handled by 5 ns1.nic.GP. GT mail is handled by 10 ASPMX.L.GOOGLE.COM. GT mail is handled by 20 ALT1.ASPMX.L.GOOGLE.COM. GT mail is handled by 20 ALT2.ASPMX.L.GOOGLE.COM. GT mail is handled by 30 ASPMX2.GOOGLEMAIL.COM. GT mail is handled by 30 ASPMX3.GOOGLEMAIL.COM. GT mail is handled by 30 ASPMX4.GOOGLEMAIL.COM. GT mail is handled by 30 ASPMX5.GOOGLEMAIL.COM. HR mail is handled by 5 alpha.carnet.HR. IO mail is handled by 10 mailer2.IO. KH mail is handled by 10 ns1.dns.net.KH. KM mail is handled by 100 mail1.comorestelecom.KM. LK mail is handled by 10 malithi-slt.nic.LK. LK mail is handled by 20 malithi-lc.nic.LK. MQ mail is handled by 10 mx1-mq.mediaserv.net. PA mail is handled by 5 ns.PA. TT mail is handled by 10 ALT1.ASPMX.L.GOOGLE.COM. TT mail is handled by 1 ASPMX.L.GOOGLE.COM. UA mail is handled by 10 mr.kolo.net. VA mail is handled by 100 raphaelmx3.posta.VA. VA mail is handled by 10 raphaelmx1.posta.VA. VA mail is handled by 10 raphaelmx2.posta.VA. WS mail is handled by 10 mail.worldsite.WS. YE mail is handled by 10 mail.yemen.net.YE. 3. IANA Considerations The script in Appendix A relies on IANA continuing to publish a copy of the TLDs in the root zone at http://data.iana.org/TLD/tlds-alpha- by-domain.txt. 4. Security Considerations This document lists the known dotless domains; it does not express an opinion whether or not there are security considerations with the existence of dotless domains. The referenced IAB and SSAC reports discuss the opinions of the respective bodies on the security and stability considerations of dotless domains. 5. Acknowledgements Levine & Hoffman Expires March 21, 2014 [Page 4] Internet-Draft Already-Dotless TLDs September 2013 Andrew Sullivan and Marc Blanchet gave helpful comments on this document. 6. Informative References [IAB-DOTLESS] Internet Architecture Board, "Dotless Domains Considered Harmful", July 2013, . [NGPC-DOTLESS] New gTLD Program Committee of the ICANN BOard, "Approved Resolution on Dotless Domains", September 2013, . [SAC053] ICANN Security and Stability Advisory Committee, "SSAC Report on Dotless Domains", February 2012, . Appendix A. Script for Finding Dotless Domains The following Bourne shell script was used for finding the data in this document. The authors believe that this script will work correctly on a wide variety of operating systems, and will continue to do so in the foreseeable future. As is customary in the current legal environment, the authors make no assurance that the script is correct or that the script will not cause damage on a system where it is run. The script checks each nameserver for each TLD instead of just doing a simple query because the nameservers for some of the TLDs have inconsistent data in them with respect to the records shown here. #! /bin/sh # Get the current list of TLDs from IANA wget -O orig.txt http://data.iana.org/TLD/tlds-alpha-by-domain.txt # Remove the comment at the top of the file grep -v '^#' orig.txt > TLDs.txt # Get all the nameservers while read tld; do host -t NS $tld; done < TLDs.txt > TLD-servers.txt # Do queries for each record type, and do them on each nameserver for rec in A AAAA MX; do while read tld ignorea ignoreb ns; do host -t $rec $tld. $ns; done < TLD-servers.txt; done > all-out.txt # Print the results Levine & Hoffman Expires March 21, 2014 [Page 5] Internet-Draft Already-Dotless TLDs September 2013 grep "has address" all-out.txt | sort -uf grep "has IPv6" all-out.txt | sort -uf grep "mail is handled" all-out.txt | sort -uf Authors' Addresses John Levine Taughannock Networks Email: standards@taugh.com Paul Hoffman Cybersecurity Association Email: paul.hoffman@cybersecurity.org Levine & Hoffman Expires March 21, 2014 [Page 6]