Robtex

Up: 77.91.64.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 77.91.64.0/25
Down right: 77.91.64.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
77.91.64.3	PTR	mail.prime-line.ru
77.91.64.3	A	fotontel.ru
77.91.64.3	A	telinn.com
77.91.64.22	PTR	office.prime-line.ru
77.91.64.23	PTR	broadcast.prime-line.ru
77.91.64.24	PTR	network.prime-line.ru
77.91.64.27	PTR	broadcast.prime-line.ru
77.91.64.31	PTR	broadcast.prime-line.ru
77.91.64.40	PTR	goldlink-ix-gw.prime-line.ru
77.91.64.41	PTR	goldlink-ix.prime-line.ru
77.91.64.46	PTR	protvino-net.prime-line.ru
77.91.64.58	PTR	tetratelematics-ix.prime-line.ru
77.91.64.93	PTR	gifts-gw.prime-line.ru
77.91.64.121	PTR	darnet-ix.prime-line.ru
77.91.64.125	PTR	sv-telecom-gw.prime-line.ru
77.91.64.126	PTR	sv-telecom.prime-line.ru
77.91.64.127	PTR	broadcast.prime-line.ru
77.91.64.174	PTR	sv-telecom.prime-line.ru
77.91.64.178	PTR	sv-telecom.prime-line.ru
77.91.64.186	PTR	white-house.prime-line.ru
77.91.64.197	PTR	izdatelstvo.prime-line.ru
77.91.64.201	PTR	cr1-nk-7606-primeline-gw.spacenet.ru
77.91.64.206	PTR	sv-telecom.prime-line.ru
77.91.64.214	PTR	darnet.prime-line.ru