I posted in October the last remaining 131 2-character .io domains. I checked them again last night and they are now all gone.
The domain g2.io was registered on July 15th, which was the last available 2-character .io domain:
Domain Handle : DOM-309097 Domain Name : g2.io Domain Status : Live First Registered : 2015-07-15 Last Updated : 2015-07-15 Expiry : 2016-07-15
Domain Handle : DOM-71660 Domain Name : go.io Domain Status : Live First Registered : 1999-02-03 Last Updated : 2014-08-16 Expiry : 2015-11-25
When will the last of the 3-character .io domains be registered? There are still a lot left, but if the huge recent spike in interest in .io domains continues, it won’t be as long as we think.