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Most of the major registrars have a 3 character minimum for second-level domains. However, I know that it's possible to register them. (a.cc, o.co)

You can even register single character unicode domain names (௫.net, ✈.com, ಠ.com)

How is that possible? I know that IANA has most of the .coms restricted, but other TLDs are available and I'm sure more are to come.

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Obligatory Wikipedia link: en.wikipedia.org/wiki/Single-letter_second-level_domain – Ilmari Karonen Jan 11 '12 at 14:55
I don't see anything about where to go or how to register them in this article. – Steve Robbins Jan 11 '12 at 20:03
up vote 2 down vote accepted

If you already use a registrar that supports your given TLD, have you tried contacting sales(or support) directly. Obviously the domains are valid, so it might just be dumb assumptions on their web site's front-end that they can work around by working with the registration process directly. It seems reasonable that they'd prefer doing that extra bit of work than to lose your business.

Moniker doesn't complain about searches for single-char domain names. (versus GoDaddy just plain saying they're "invalid.") Their search results page uses some icons that make it a bit confusing whether or not something's available, but I just tried a search for a domain that did turn out to be free, and it's offering to let me purchase, so it does work. You'll just have to get used to the interface.

There's a potential further complication in that you didn't say which actual TLD you were after, but they have a pretty wide selection available.

For whatever it's worth, o.co has MarkMonitor listed as the registrar, but they presumably offer that as part of their services, and not something you can just handle on your own.

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I notice MarkMonitor is also google's registrar. I think their just the choice registrar for professional corporations and their high value domains. – Steve Robbins Jan 11 '12 at 0:54

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