[bart@puter]~$ host 217.99.130.119
^^
119.130.99.217.in-addr.arpa. domain name pointer pc119.oswiecim.sdi.tpnet.pl.
[bart@puter]~$ host pc119.oswiecim.sdi.tpnet.pl
pc119.oswiecim.sdi.tpnet.pl. has address 217.98.130.119
^^
[bart@puter]~$ host 217.98.130.119
119.130.98.217.in-addr.arpa. domain name pointer pe119.pila.sdi.tpnet.pl.
[bart@puter]~$ host pe119.pila.sdi.tpnet.pl
pe119.pila.sdi.tpnet.pl. has address 217.98.130.119

bart
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bart @bart.w-wa.pl || http://bart.w-wa.pl || http://faq.pl/php/