139.170.in-addr.arpa is a domain controlled by five nameservers. Some of them are on the same IP network. vt.edu, ias.edu, aub.edu, fnfg.com, sprint.com and at least 36 other hosts share nameservers with this domain. 170.in-addr.arpa is a domain controlled by seven nameservers at arin.net. All of them are on different IP networks.