Robtex

Up: 81.88.64.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 81.88.80.0/21
Down right: 81.88.88.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.88.80.11	A	sip.qip.ru
81.88.80.21	PTR	msk-m9-sw01-core-vlan-119.mangotele.com
81.88.80.36	PTR	mangosip.ru
81.88.80.50	A+PTR	ns1.bwtele.com
81.88.80.50	A	ns2.mango-office.ru
81.88.80.50	A	ns1.mango-office.ru
81.88.80.51	PTR	wwwsuper.mangotele.com
81.88.80.51	A	mangomail.ru
81.88.80.52	PTR	wwwsuper.mangotele.com
81.88.80.60	A	relay.bwtele.com
81.88.80.60	A	mx1.mangotele.com
81.88.80.66	PTR	cms.bwtele.com
81.88.80.254	A	sapper.bwtele.com
81.88.81.8	A	mcw.mango-office.ru
81.88.81.166	PTR	alaska.aloha.ru
81.88.82.50	A	www.mango-loyalty.ru
81.88.82.50	A	mango-loyalty.ru
81.88.82.53	PTR	mx3.mangotele.com
81.88.82.53	A	relay.bwtele.com
81.88.82.53	A	mx1.mangotele.com
81.88.82.54	PTR	mx4.mangotele.com
81.88.82.74	A	mangohelp.ru
81.88.82.74	A	wiki.mangotele.com
81.88.82.130	PTR	msk-prof57-rt02-fl8-lo-3-nat02.mangotele.com
81.88.82.213	A	chatapi.mango-office.ru
81.88.82.225	PTR	ics-prod-front.ru.mgo.su
81.88.82.225	A+PTR	widgets.mango-office.ru
81.88.82.227	PTR	itg-prod-node2.ru.mgo.su
81.88.82.238	A	dct.mango-office.ru
81.88.83.130	PTR	msk-prof57-rt01-fl2-lo-0-nat01.mangotele.com
81.88.84.2	PTR	spb-gw.mangotele.com
81.88.84.2	A	spb.bwtele.com
81.88.84.18	A	spb.mangotele.com
81.88.85.71	A	lk.mango-office.ru
81.88.85.71	A	issa.mangotele.com
81.88.85.78	A	widget.mango-office.ru
81.88.85.79	A	auth.mango-office.ru
81.88.85.80	A	ab.mango-office.ru
81.88.85.129	PTR	nevada-lo-0.mangotele.com
81.88.86.11	A	lukas.mangosip.ru
81.88.86.11	A	www.mangosip.ru
81.88.86.11	A	mangosip.ru
81.88.86.36	A	uber.mangosip.ru
81.88.86.36	A	vpbx300298499.mangosip.ru