go
ac.q.port80.se, ns1.q.port80.se, ns5.q.port80.se, ns4.q.port80.se, ns6.q.port80.se and at least eleven other hosts are subdomains to this hostname. port80.se is a domain controlled by four nameservers. All of them are on different IP networks. Incoming mail for port80.se is handled by one mailserver at phonera.se. port80.se has one IP number.

port80.se
a records
 
+ 82.96.56.125 82.96.56.0/21 AS39369  
+ ---  
ns-soa records
ns1.q.port80.se
+ 217.75.109.220 217.75.104.0/21 AS39369 -
+ --- -
ns records
ns1.q.port80.se
+ 217.75.109.220 217.75.104.0/21 AS39369 -
+ --- -
ns2.q.port80.se
+ 82.96.2.250 82.96.2.0/24 AS16150 -
ns3.q.p80.net
+ 82.96.9.250 82.96.9.0/24 AS16150 -
ns4.q.p80.net
+ 82.96.8.250 82.96.0.0/20 AS16150 -
mx records
mxf.phonera.se
+ 93.158.77.49 93.158.64.0/20 AS39369 -
+ --- -
subdomains
ac.q.port80.se
ac0.q.port80.se
ac0b.q.port80.se
ac1.q.port80.se
ac1b.q.port80.se
arpbeacon.q.port80.se
brickwall.q.port80.se
devnull.q.port80.se
noarp.q.port80.se
ns1.q.port80.se
ns2.q.port80.se
ns3.q.port80.se
ns4.q.port80.se
ns5.q.port80.se
ns6.q.port80.se
nullroute.q.port80.se