Washington Post: Most Spam Sites Tied to Just 10 Registrars
1. XinNet Cyber Information Company Limited
2. eNom
3. Network Solutions
4. Register.com
5. Planet Online
6. Regtime Ltd.
7. OnlineNIC Inc.
8. Spot Domain LLC
9. Wild West Domains
10. Hichina Web Solutions
I suppose that one way to give these numbers meaning would be to compare the number of ‘spam sites’ to the number of all domain names registered by that registrar.