- 1&1 Internet: 55,000 servers (company)
- Rackspace: 50,038 servers (company)
- The Planet: 48,500 servers (company)
- Akamai Technologies: 48,000 servers (company)
- OVH: 40,000 to 55,000 servers (company)
- SBC Communications: 29,193 servers (Netcraft)
- Verizon: 25,788 servers (Netcraft)
- Time Warner Cable: 24,817 servers (Netcraft)
- SoftLayer: 21,000 servers (company)
- AT&T: 20,268 servers (Netcraft)
- Peer1/ServerBeach: 10,277 servers (company)
- iWeb: 10,000 servers (company)
Source: Data Center Knowledge