Robtex

Up: 185.50.136.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 185.50.136.0/23
Down right: 185.50.138.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
185.50.136.36	A	a.petrukhin.com
185.50.136.36	A	a.petrukhin.ru
185.50.138.130	PTR	mx.vh-daf.ru
185.50.138.130	A	mx.turbosparts.ru
185.50.138.130	A	mx.vh-dongfeng.ru
185.50.138.195	A+PTR	mail2.russcollector.ru
185.50.138.197	A	russcollector.net
185.50.138.197	A	russcollector.org
185.50.138.197	A	russcollector.com