Summary
btmx4.sun.com has one IP number , but the reverse is
relay4i.sun.com.
sun.fi,
sun.dk,
sun.be,
sun.de,
sun.es and at least 78 other hosts use this as a mailserver.
sun.com is a domain controlled by four nameservers at
sun.com themselves. All of them are on different IP networks. Incoming mail for
sun.com is handled by four mailservers having a total of six IP numbers. Some of them are on the same IP network.
sun.com has one IP number.
btmx4.sun.com is hosted on a server in United States.