Summary
spiteful.xo.com has one IP number , which also has a corresponding reverse pointer.
sfcb.net,
sdrl.com,
algx.com,
lib.nj.us,
scfd4.org and at least 100 other hosts use this as a mailserver.
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 having a total of two IP numbers. They are on different IP networks.
xo.com has one IP number.
spiteful.xo.com is hosted on a server in United States.