Robtex

Up: 217.66.144.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 217.66.148.0/23
Down right: 217.66.150.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
217.66.148.25	A+PTR	host-25-148-66-217.spbmts.ru
217.66.148.219	A	mail2.tc-v.ru
217.66.148.251	A+PTR	host-251-148-66-217.spbmts.ru
217.66.148.251	A	mx3.rok1.spb.ru
217.66.149.113	PTR	host-113-149-66-217.spbmts.ru
217.66.149.113	A	mx1.inta-ugol.com
217.66.149.113	A	mail.1317.ru
217.66.149.196	A+PTR	host-196-149-66-217.spbmts.ru
217.66.149.196	A	7realm.com
217.66.149.196	A	ciferox.com
217.66.150.16	PTR	host-16-150-66-217.spbmts.ru
217.66.150.31	A	host-31-150-66-217.spbmts.ru
217.66.150.41	A	host-41-150-66-217.spbmts.ru
217.66.150.42	A+PTR	host-42-150-66-217.spbmts.ru
217.66.150.44	A	host-44-150-66-217.spbmts.ru
217.66.150.82	A	host-82-150-66-217.spbmts.ru
217.66.150.93	A+PTR	host-93-150-66-217.spbmts.ru
217.66.150.143	A+PTR	host-143-150-66-217.spbmts.ru
217.66.150.196	A+PTR	host-196-150-66-217.spbmts.ru
217.66.150.212	PTR	host-212-150-66-217.spbmts.ru
217.66.151.101	A+PTR	host-101-151-66-217.spbmts.ru
217.66.151.108	A+PTR	host-108-151-66-217.spbmts.ru
217.66.151.159	A	host-159-151-66-217.spbmts.ru