Summary
72.136.193.in-addr.arpa is delegated to four nameservers, however three delegated nameservers are missing in the zone and three other nameservers are listed instead. Two nameservers have the same IP number. Some of them are on the same IP network.
pt,
ucp.pt,
dns.pt,
essi.pt,
ricoh.pt and at least 56 other hosts share nameservers with this domain.
pt.72.136.193.in-addr.arpa are subdomains to this hostname.
136.193.in-addr.arpa is a domain controlled by four nameservers. All of them are on the same IP network.