Robtex

Up: 37.139.40.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 37.139.40.0/23
Down right: 37.139.42.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
37.139.40.0	A+PTR	37-139-40-0.customer.comfortel.pro
37.139.40.10	PTR	37-139-40-10.customer.comfortel.pro
37.139.40.10	A	ns1.mighost.org
37.139.40.10	A	ns1.mighost.ru
37.139.40.12	PTR	12.mcs.mail.ru
37.139.40.12	A	37-139-40-12.customer.comfortel.pro
37.139.40.12	A	mighost.ru
37.139.40.255	PTR	37-139-40-255.customer.comfortel.pro
37.139.41.0	PTR	37-139-41-0.customer.comfortel.pro
37.139.41.2	A	mail.conti-vivat.com
37.139.41.34	A+PTR	37-139-41-34.customer.comfortel.pro
37.139.41.34	A	ns.xn--80ach7ahcadecpgkj.xn--p1ai
37.139.41.34	A	ns.xn--80abj7ahcacbeoerj.xn--p1ai
37.139.41.35	PTR	mail.en-corp.ru
37.139.41.37	PTR	en-corp.ru
37.139.41.37	A	posudaoptom.ru
37.139.41.37	A	xn----8sblcttdefdccajedcoliiis.xn--p1ai
37.139.41.54	A	mail.ortos.biz
37.139.41.146	A	gsrest.ru
37.139.41.146	A	www.gsrest.ru
37.139.41.162	A+PTR	37-139-41-162.customer.comfortel.pro
37.139.41.175	A+PTR	37-139-41-175.customer.comfortel.pro
37.139.41.194	A+PTR	mx.ets-gr.ru
37.139.41.194	A	37-139-41-194.customer.comfortel.pro
37.139.41.206	PTR	37-139-41-206.customer.comfortel.pro
37.139.41.206	A	mail.razvozov.com
37.139.41.210	A	office.it-depot.ru
37.139.41.250	PTR	meerix.ru
37.139.41.250	A	www.posix.ru
37.139.41.250	A	ns1.cafepuerto.ru
37.139.41.255	PTR	37-139-41-255.customer.comfortel.pro
37.139.42.0	PTR	37-139-42-0.customer.comfortel.pro
37.139.42.56	PTR	37-139-42-56.customer.comfortel.pro
37.139.42.61	A	37-139-42-61.customer.telecompas.pro
37.139.42.94	A	37-139-42-94.customer.telecompas.pro
37.139.42.105	PTR	37-139-42-105.customer.comfortel.pro
37.139.42.224	A+PTR	37-139-42-224.customer.uut-telecom.ru
37.139.42.224	A	37-139-42-224.customer.comfortel.pro
37.139.42.255	PTR	37-139-42-255.customer.comfortel.pro
37.139.43.0	PTR	37-139-43-0.customer.comfortel.pro