Robtex

Up: 212.12.8.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 212.12.8.0/25
Down right: 212.12.8.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
212.12.8.4	PTR	mail.tsrs.ru
212.12.8.7	PTR	rev-7-8-12-212.tula.net
212.12.8.8	PTR	rev-8-8-12-212.tula.net
212.12.8.8	A	mx.alexfill-print.ru
212.12.8.8	A	mx.alexfill.ru
212.12.8.29	A	mail.s-gres.ru
212.12.8.255	PTR	rev-255-8-12-212.tula.net