Robtex

Up: 61.247.176.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 61.247.176.0/22
Down right: 61.247.180.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
61.247.176.2	A+PTR	ftp.optimaxbd.net
61.247.176.2	A+PTR	www.ftp.optimaxbd.net
61.247.176.154	A+PTR	mail.zabou-bd.com
61.247.176.154	A	zabou-bd.com
61.247.176.198	A+PTR	mail.sharmingroup.com
61.247.178.68	A	ke6jc6vw5d.com
61.247.178.68	A	mh7ra3b2tu.com
61.247.178.68	A	ev6wk8ed7cw.com
61.247.178.69	PTR	server-69.optimaxbd.net
61.247.178.71	PTR	server-71.optimaxbd.net
61.247.178.72	PTR	officialie.com
61.247.178.72	A	orvis-servicer.com
61.247.178.72	A	mail.gjtmgrtgwbyumhz.com
61.247.178.73	PTR	m.netjpcomwww.com
61.247.178.77	PTR	server-77.optimaxbd.net
61.247.178.158	PTR	server-158.optimaxbd.net
61.247.179.10	PTR	server-10.optimaxbd.net
61.247.179.10	A	vjsaravanan.net
61.247.179.166	A+PTR	mail.lilafyfashions.com
61.247.179.194	PTR	server-194.optimaxbd.net
61.247.179.194	A	turstscom.com
61.247.179.218	A	ckotha.com
61.247.179.238	A	mcashstar.com
61.247.180.214	PTR	server-214.optimaxbd.net
61.247.181.58	A	www.abcdsebroker.com
61.247.181.58	A	abcdsebroker.com
61.247.181.60	A+PTR	mail.abcdsebroker.com
61.247.181.150	PTR	server-150.optimaxbd.net
61.247.181.178	PTR	server-178.optimaxbd.net
61.247.181.178	A	9z967x9f2g4j6uu.com
61.247.181.178	A	mail.kc3pcu5itj4ssnz.com
61.247.182.10	PTR	server-10.optimaxbd.net
61.247.182.246	A+PTR	mail.gti-bd.com
61.247.182.246	A	gti-bd.com
61.247.182.251	A	mail.techeyes.org
61.247.183.46	PTR	server-46.optimaxbd.net
61.247.183.116	PTR	server-116.optimaxbd.net
61.247.183.183	A	mx.jonoshova.com
61.247.183.185	PTR	server-185.optimaxbd.net
61.247.183.185	A	syncdialer.com
61.247.183.185	A	jonoshova.com
61.247.183.206	PTR	server-206.optimaxbd.net
61.247.183.206	A	mail.ygm-bd.com
61.247.183.206	A	ygm-bd.com