ajax.xo.com has one IP number , which also has a corresponding reverse pointer. wal.org, swcp.cc, ppgi.net, ncil.org, cgsm.org and at least 100 other hosts point to the same IP. xo.com is a domain controlled by three nameservers at xo.com themselves. Two of them are on the same IP network. Incoming mail for xo.com is handled by one mailserver at global.frontbridge.com. xo.com has one IP number. ajax.xo.com is hosted on a server in United States.