Arpa (the tld arpa) is a domain controlled by twelve domain name servers at
root-servers.net having a total of 20 IP numbers. All 20 of them are on different IP networks.
eme.jp and at least nine other hosts share name servers with this domain.
arpa share name servers under another name with this domain.
noptr.arpa and at least 94 other hosts are hosts under this domain.
arpa.it and at least 31 other hosts are similar domain names.
Four of the eleven domains that use the name server
a.root-servers.net point to the IP number