Although Verisign do not publish the official figures, Registrar Strats has estimated that the 100 million .COM active registrations mark will be passed very shortly.
Registrar Stats estimates there are currently 98,010,231 .COM registrations, around 45 per cent of all active registrations globally. This easily eclipses the second biggest Top Level Domain, .DE (Germany), currently with 14,651,368 registrations and then .NET with 14,231,291.
In fourth place is .UK (United Kingdom) with 9,703,189 registrations and then .INFO with 8,177,579 registrations.
The above gTLD statistics come from Registrar Stats while ccTLD statistics come from the registry websites.