Robtex

Up: 80.79.64.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 80.79.72.0/22
Down right: 80.79.76.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
80.79.72.74	PTR	mail-server.ffcenter.ru
80.79.72.130	A	mail.itech-systems.ru
80.79.72.130	A	mail.judo-card.ru
80.79.72.130	A	mail.judo-card.com
80.79.72.155	A	lbrsk.ru
80.79.72.156	A+PTR	srv06.lbrsk.ru
80.79.72.156	A	mx.lbrsk.ru
80.79.72.157	A+PTR	srv14.lbrsk.ru
80.79.76.138	A	mail.agroplemsoyuz.ru
80.79.76.155	A	inform-tech.ru
80.79.78.25	A+PTR	mail.moscoms.ru
80.79.78.25	A+PTR	autodiscover.moscoms.ru
80.79.78.25	A+PTR	ex.moscoms.ru
80.79.78.52	A	ns1v.moscoms.ru
80.79.78.53	A	ns2v.moscoms.ru
80.79.78.71	A	www.moscoms.ru
80.79.78.77	A	lopez.es
80.79.78.80	A	moscoms.ru
80.79.78.80	A	rrcentre.ru
80.79.78.97	PTR	autodiscover.rrcentre.ru
80.79.78.97	PTR	mail.rrcentre.ru
80.79.78.97	A+PTR	mx.rrcentre.ru
80.79.78.98	A	mx.book-foundation.com
80.79.78.100	A+PTR	mx.leningradcenter.ru
80.79.78.100	PTR	ma.leningradcenter.ru
80.79.78.100	A+PTR	mail.leningradcenter.ru
80.79.78.106	A+PTR	mx.russair.spb.ru
80.79.78.106	PTR	autodiscover.russair.spb.ru
80.79.78.106	A+PTR	autodiscover.russair.aero
80.79.78.114	A+PTR	mail.terra-nordica.ru
80.79.78.114	A+PTR	autodiscover.terra-nordica.ru
80.79.78.115	A	mail.agro-nova.com
80.79.78.128	A+PTR	autodiscover.nord-park.com
80.79.78.128	A+PTR	mail.nord-park.com
80.79.78.129	A+PTR	autodiscover.kordeks.ru
80.79.78.129	A+PTR	mail.kordeks.ru
80.79.78.132	PTR	autodiscover.valday.center
80.79.78.132	PTR	mail.valday.center
80.79.78.137	A+PTR	mail.igoratour.ru
80.79.78.137	A+PTR	autodiscover.igoratour.ru