Robtex

Up: 83.149.40.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 83.149.40.0/25
Down right: 83.149.40.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
83.149.40.67	A	sms.megafoncenter.ru
83.149.40.77	A+PTR	mail.megafoncenter.ru
83.149.40.77	A	mail.megafon-centre.ru
83.149.40.77	A	mail.megafon-center.ru
83.149.40.87	A+PTR	cnt-mx01.megafon.ru
83.149.40.88	A+PTR	cnt-mx02.megafon.ru
83.149.40.89	A+PTR	mail1.megafoncenter.ru
83.149.40.101	A+PTR	ns1.megafoncenter.ru