Robtex

Up: 151.237.240.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 151.237.240.0/22
Down right: 151.237.244.0/22

IP	Type	Hostname
151.237.240.4	A+PTR	mail.alexandrinsky.ru
151.237.240.4	A	mail.alexandrinsky.com
151.237.240.27	A	www.alexandrinsky.ru
151.237.240.27	A	alexandrinsky.ru
151.237.241.151	A	pro100.su
151.237.241.152	A	mail.pro100.su
151.237.241.178	A	elvis2.target.spb.ru
151.237.241.243	A+PTR	mail-in2.spbaep.ru
151.237.241.247	PTR	beavis.spbaep.ru
151.237.241.248	A	mail-in3.spbaep.ru
151.237.241.250	A+PTR	butt-head.spbaep.ru
151.237.241.253	A+PTR	mail-in1.spbaep.ru
151.237.241.254	A+PTR	proxy-new.spbaep.ru