Robtex

Up: 91.238.40.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 91.238.44.0/23
Down right: 91.238.46.0/23

IP	Type	Hostname
91.238.44.17	PTR	ppp91-238-44-17.pppoe.sisamara.ru.44.238.91.in-addr.arpa
91.238.45.222	PTR	ppp91-238-45-222.pppoe.sisamara.ru.45.238.91.in-addr.arpa
91.238.46.192	PTR	ppp91-238-46-192.pppoe.sisamara.ru.46.238.91.in-addr.arpa
91.238.47.5	PTR	ppp91-238-47-5.pppoe.sisamara.ru.47.238.91.in-addr.arpa
91.238.47.51	PTR	ppp91-238-47-51.pppoe.sisamara.ru.47.238.91.in-addr.arpa
91.238.47.73	PTR	ppp91-238-47-73.pppoe.sisamara.ru.47.238.91.in-addr.arpa
91.238.47.91	PTR	ppp91-238-47-91.pppoe.sisamara.ru.47.238.91.in-addr.arpa
91.238.47.111	PTR	ppp91-238-47-111.pppoe.sisamara.ru.47.238.91.in-addr.arpa
91.238.47.128	PTR	ppp91-238-47-128.pppoe.sisamara.ru.47.238.91.in-addr.arpa
91.238.47.195	PTR	ppp91-238-47-195.pppoe.sisamara.ru.47.238.91.in-addr.arpa