I've been doing some research on the numbers of brand protection registrations in the various gTLDs. While it is not possible to get 100% accuracy without checking each domain name individually, there is another approach of checking if a domain is registered in other TLDs and on the same hoster. Brand protection registrations by their very nature will have the same domain appearing across more than one TLD. The TLDs in the survey were .com .net .org .biz .info .mobi and .asia and the zonefiles were for 01/July/2010. The total number of domains in the survey was 119,361,431. These are the results:
TLD - Total - Cross TLD Domains - Percentage
.com - 88,204,371 - 6,619,959 - 7.50%
.net - 13,143,605 - 6,074,721 - 46.22%
.org - 8,329,647 - 3,940,164 - 47.30%
.biz - 2,062,053 - 1,192,120 - 57.81%
.info - 6,471,955 - 2,470,769 - 38.18%
.mobi - 969,061 - 493,954 - 50.97%
.asia - 180,739 - 62,937 - 34.82%
The .com percentage is comparatively low because of its size. Many people registering their domain in a ccTLD will also register their domain in .com if it is available. What is amazing about these figures is the way that possible brand protection registrations form a major part of the newer TLD registration numbers. The .info figures are strange because of the way that registrations are subsidised.
Regards...jmcc