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Re:Oldest domains in the .com, .net, and .org TLDs by swyx on Tuesday June 26, 2018 @01:27PM (#17402485)
are single letter domains not allowed? surprised two letter domains are not more common.
Re:Oldest domains in the .com, .net, and .org TLDs by foxhop on Tuesday June 26, 2018 @08:57PM (#17405080)
Re:Oldest domains in the .com, .net, and .org TLDs by cbhl on Tuesday June 26, 2018 @01:36PM (#17402561)
https://en.wikipedia.org/wiki/Single-letter_second-level_dom...

tl;dr: IANA reserved all the single-letter domains in 1993, except for some that had been grandfathered in.

All the two-letter .com domains are registered, and only available on the secondary market.

Re:Oldest domains in the .com, .net, and .org TLDs by chejazi on Tuesday June 26, 2018 @03:20PM (#17403308)
There's also single-character punycode domains, e.g. ¢.com which converts to http://xn--8a.com
Re:Oldest domains in the .com, .net, and .org TLDs by everdev on Tuesday June 26, 2018 @01:31PM (#17402524)
x.com, but maybe it's not one of the oldest
Re:Oldest domains in the .com, .net, and .org TLDs by smhenderson on Tuesday June 26, 2018 @01:34PM (#17402548)
There's x.org as well - the Open Group. But it wasn't registered until 1997.
Re:Oldest domains in the .com, .net, and .org TLDs by kps on Tuesday June 26, 2018 @02:38PM (#17403013)
Except that x.org was one of the single-letter domains grandfathered in 1993.