Robtex

Up: 77.72.240.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 77.72.248.0/22
Down right: 77.72.252.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
77.72.248.2	A+PTR	ns.idea-tele.com
77.72.248.4	A	wss.tpidea.ru
77.72.248.130	A+PTR	blackhole.idea-tele.com
77.72.248.133	A	mail.ideacapital.ru
77.72.248.134	PTR	mail.lmc-vr.ru
77.72.248.134	A+PTR	mail.people-promo.ru
77.72.248.134	A	mail.lmcagency.com
77.72.248.136	PTR	136.248.72.77.in-addr.arpa
77.72.248.138	A	ns1.idea-tele.com
77.72.249.10	PTR	mail.anterra.info
77.72.249.10	A	ns.i-anterra.ru
77.72.249.10	A	ns.nt-21.ru
77.72.249.11	PTR	i-anterra.ru
77.72.249.11	A	mail.nt-21.ru
77.72.249.23	A	boltix.ru
77.72.249.23	A	mail.sdaiu.ru
77.72.249.120	PTR	m.onlc.ru
77.72.249.136	A+PTR	mail.akbars-capital.ru
77.72.249.136	PTR	uk.akbars.ru
77.72.249.136	A	mx2.uk.akbars.ru
77.72.249.164	A	mx2.aima.su
77.72.249.164	A	mx2.1marka.ru
77.72.249.164	A	forum.1marka.ru
77.72.250.170	PTR	modulisa.modul-exd.com
77.72.250.242	A+PTR	siemens.idea-tele.com
77.72.250.243	PTR	c-250-243.idea-tele.com
77.72.250.243	A	siwork.ru
77.72.251.50	PTR	c-251-50.idea-tele.com
77.72.251.138	A+PTR	mail.r-bs.ru
77.72.251.138	A	mx.kompleks-it.ru
77.72.251.138	A	office.r-bs.ru
77.72.252.12	A	mail.tpidea.ru
77.72.252.70	A	oklass.ru
77.72.252.98	A	mail.titansurgical.com
77.72.253.9	PTR	c-253-9.idea-tele.com
77.72.253.25	PTR	c-253-25.idea-tele.com
77.72.253.51	PTR	c-253-51.idea-tele.com
77.72.253.123	PTR	c-253-123.idea-tele.com
77.72.253.144	PTR	c-253-144.idea-tele.com
77.72.254.3	PTR	c-254-3.idea-tele.com
77.72.254.36	A	mail.mablos.com
77.72.254.90	PTR	c-254-90.idea-tele.com
77.72.254.96	PTR	c-254-96.idea-tele.com
77.72.254.98	PTR	c-254-98.idea-tele.com
77.72.254.162	PTR	c-254-162.idea-tele.com
77.72.254.198	A	idea-tele.com
77.72.254.198	A	www.idea-tele.com
77.72.254.203	PTR	c-254-203.idea-tele.com
77.72.255.14	A	mail.nexteng.ru
77.72.255.18	PTR	c-255-18.idea-tele.com
77.72.255.18	A	mail.incomsystem.net
77.72.255.66	A+PTR	mail.himgrad.ru
77.72.255.66	A	mail.rental-pm.ru
77.72.255.66	A	mail.xn----8sbifbsbvmflamvki6ci.xn--p1ai