All domains are registered

As of 2016-03-18 all 3-digit .io domains have been registered. Huge numbers were registered in December and January, and then the last remaining 7 were taken on Friday.

According to my records the oldest domain is, which was registered on 2006-09-12. It is actually the oldest .io domain containing only digits. was registered a couple months later on 2006-11-24, and was registered next on 2009-03-23. None of these load actual websites - they either do not resolve or show server error pages.

The last ones picked up on Friday were:

The highest reported sale was, which sold on Flippa in May 2014 for $3,888. also sold on Flippa, in December 2015, for $2,777, and sold on Sedo earlier this year for £788.