Summary
tx.ac.pl has one IP number , but the reverse is
ns1.ogicom.pl.
ns1.arx.pl,
ns2.dk1.pl,
dns1.nse.pl,
dns.sisco.pl,
ns6.blink.pl and at least 49 other hosts point to the same IP.
mti.pl,
sieci.net,
ventor.pl,
ekobau.pl,
ratgar.pl and at least three other hosts use this as a nameserver.
ac.pl is delegated to two nameservers, however both delegated nameservers are missing in the zone. They are on different IP networks. Incoming mail for
ac.pl is handled by one mailserver at
ogicom.pl.
ac.pl has one IP number.
tx.ac.pl is hosted on a server in Poland.