look at FreeBSD PR bin/32318

Jim Knoble's hostinfo seems like a more full-featured tool.
http://www.ntrnet.net/~jmknoble/software/hostinfo/

gethostbyname2 (defined by RFC-2133) has been obsoleted by RFC-2553
and all applications should use getaddrinfo(3) or getnodebyname(3).

It is recommended to use getaddrinfo/getnameinfo, it's easier and clean.
