171.91.139.in-addr.arpa is a domain controlled by three nameservers at ics.forth.gr. All of them are on the same IP network. gr, ac.cy, gov.cy, edu.gr, org.gr and at least 69 other hosts share nameservers with this domain. 91.139.in-addr.arpa is a domain controlled by four nameservers. Two of them are on the same IP network.