Editing Country code top-level domain (section)

===Historical ccTLDs===
ccTLDs may be removed if that country ceases to exist. There are three ccTLDs that have been deleted after the corresponding 2-letter code was withdrawn from ISO 3166-1: <code>[[.cs|cs]]</code> (for [[Czechoslovakia]]), <code>[[.zr|zr]]</code> (for [[Zaire]]) and <code>[[.tp|tp]]</code> (for [[East Timor]]). There may be a significant delay between withdrawal from ISO 3166-1 and deletion from the DNS; for example, ZR ceased to be an ISO 3166-1 code in 1997, but the <code>zr</code> ccTLD was not deleted until 2001. Other ccTLDs corresponding to obsolete ISO 3166-1 codes have not yet been deleted. In some cases they may never be deleted due to the amount of disruption this would cause for a heavily used ccTLD. In particular, the Soviet Union's ccTLD <code>[[.su|su]]</code> remains in use more than twenty years after SU was removed from ISO 3166-1.

The historical country codes <code>[[.dd|dd]]</code> for the [[German Democratic Republic]] and <code>yd</code> for [[South Yemen]] were eligible for a ccTLD, but not allocated; see also <code>[[.de|de]]</code> and <code>[[.ye|ye]]</code>.

The temporary reassignment of country code <code>cs</code> ([[Serbia and Montenegro]]) until its split into <code>[[.rs|rs]]</code> and <code>[[.me|me]]</code> ([[Serbia]] and [[Montenegro]], respectively) led to some controversies<ref>{{cite web|title=IAB input related to the .cs code in ISO&nbsp;3166|date=2003-09-24|first=Leslie|last=Daigle|publisher=[[Internet Architecture Board|IAB]]|url=https://www.iab.org/documents/correspondence-reports-documents/docs2003/2003-09-25-icann-cs-code/|access-date=2008-06-22|archive-date=2008-07-05|archive-url=https://web.archive.org/web/20080705023649/http://www.iab.org/documents/correspondence/2003-09-25-icann-cs-code.html|url-status=live|language=en}}</ref><ref>{{cite web|title=IAB comment on stability of ISO 3166 and other infrastructure standards|date=2003-09-24|first=Leslie|last=Daigle|publisher=[[Internet Architecture Board|IAB]]|url=http://www.iab.org/documents/correspondence/2003-09-25-iso-cs-code.html|access-date=2008-06-22|archive-date=2008-07-05|archive-url=https://web.archive.org/web/20080705024112/http://www.iab.org/documents/correspondence/2003-09-25-iso-cs-code.html|url-status=dead|language=en}}</ref> about the stability of ISO 3166-1 country codes, resulting in a second edition of ISO&nbsp;3166-1 in 2007 with a guarantee that retired codes will not be reassigned for at least 50&nbsp;years, and the replacement of RFC&nbsp;3066 by RFC&nbsp;4646 for country codes used in [[language tag]]s in 2006.

The previous ISO&nbsp;3166-1 code for [[Yugoslavia]], YU, was removed by ISO on 23&nbsp;July 2003, but the <code>[[.yu|yu]]</code> ccTLD remained in operation. Finally, after a two-year transition to Serbian <code>[[.rs|rs]]</code> and Montenegrin <code>[[.me|me]]</code>, the .yu domain was phased out in March&nbsp;2010.

Australia was originally assigned the <code>[[.au#Historic second-level domains|oz]]</code> country code, which was later changed to <code>[[.au|au]]</code> with the <code>.oz</code> domains moved to <code>.oz.au</code>.