bash-2.05a$ nslookup sip-gmx.net
Server: cns01.qsc.de
Address: 213.148.129.10
Non-authoritative answer:
Name: sip-gmx.net
Address: 212.227.15.196
bash-2.05a$ nslookup sip.gmx.net
Server: cns01.qsc.de
Address: 213.148.129.10
Non-authoritative answer:
Name: sip-gmx.schlund.de
Address: 212.227.15.197
Aliases: sip.gmx.net