Robtex

Up: 83.136.48.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 83.136.56.0/22
Down right: 83.136.60.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
83.136.56.3	A	gateway.mtc.com.bh
83.136.56.5	A+PTR	exch-1.bh.zain.com
83.136.56.5	A	smtp.mtc.com.bh
83.136.56.7	A+PTR	exch-2.bh.zain.com
83.136.56.13	A	viewmms.mtc-vodafone.com.bh
83.136.56.13	A	viewmms.bh.zain.com
83.136.56.25	A	rbt.bh.zain.com
83.136.56.37	PTR	relay1.mtc.com.bh
83.136.56.40	PTR	mtc-vodafone.com.bh
83.136.56.40	A+PTR	pda.mtc-vodafone.com.bh
83.136.56.40	A+PTR	wap.mtc-vodafone.com.bh
83.136.56.41	A	zain.com.bh
83.136.56.41	A	www.bh.zain.com
83.136.56.42	PTR	mail.mtc-vodafone.com.bh
83.136.56.42	PTR	smtp.mtc-vodafone.com.bh
83.136.56.42	PTR	ida.mtc.com.bh
83.136.56.52	PTR	ns1.mtc.com.bh
83.136.56.52	A	ns1.mtc-vodafone.com.bh
83.136.56.52	A	ns1.zain.com.bh
83.136.56.53	PTR	ns-4.bb.zain.com
83.136.56.53	A	ns2.mtc.com.bh
83.136.56.55	PTR	viewmms.mtc-vodafone.com.bh
83.136.56.56	A+PTR	ota.mtc-vodafone.com.bh
83.136.56.57	A+PTR	mail.mtc.com.bh
83.136.56.59	A+PTR	ida.mtc-vodafone.com.bh
83.136.56.59	PTR	smtp.mtc-vodafone.com.bh
83.136.56.59	PTR	wapmail.mtc.com.bh
83.136.56.76	A	mail.bh.zain.com
83.136.56.81	PTR	relay1.mtc.com.bh
83.136.56.81	A	www.bulkmsg.bh.zain.com
83.136.56.114	A+PTR	mta1.zain.com.bh
83.136.56.115	PTR	mail.zain.com.bh
83.136.56.115	A	mta2.zain.com.bh
83.136.56.116	A+PTR	mail.zain.com.bh
83.136.56.140	A	zainweb.bh.zain.com
83.136.56.174	A	nra.bh.zain.com
83.136.58.17	A+PTR	v502-agg.bb.zain.com
83.136.58.65	A+PTR	agg-1-man1.bb.zain.com
83.136.58.67	A	dcss-1-man1.bb.zain.com
83.136.58.68	A+PTR	dcss-2-man1.bb.zain.com
83.136.58.69	A	brd-1-man1.bb.zain.com
83.136.58.73	A+PTR	bts-r2.bb.zain.com
83.136.58.75	A+PTR	bts-r4.bb.zain.com
83.136.58.76	A	itp1.bb.zain.com
83.136.58.111	A+PTR	smtp.bb.zain.com
83.136.58.121	A+PTR	mta2.bb.zain.com
83.136.58.124	A+PTR	mta1.bb.zain.com
83.136.58.152	A+PTR	webmail.bb.zain.com
83.136.58.156	A+PTR	mailsrv1.bb.zain.com
83.136.58.173	A+PTR	plex2.bb.zain.com
83.136.58.179	PTR	adns-1.bb.zain.com
83.136.58.179	A	adns1.bb.zain.com
83.136.58.179	A	ns-1.bh.zain.com
83.136.58.180	A+PTR	adns2.bb.zain.com
83.136.58.182	PTR	ncnr1.bb.zain.com
83.136.58.182	PTR	pdns.bb.zain.com
83.136.58.185	A	block.bb.zain.com
83.136.58.187	A	cdns2.bb.zain.com
83.136.58.190	A+PTR	cnr1.bb.zain.com
83.136.58.190	A	cdns1.bb.zain.com
83.136.58.225	A	zaindeveshop.bh.zain.com
83.136.58.225	A	zaindevsite.bh.zain.com
83.136.59.137	PTR	83-136-59-137.rev.bb.zain.com
83.136.59.245	A+PTR	tafos-out.bb.zain.com
83.136.59.246	A+PTR	tsoli-out.bb.zain.com
83.136.61.59	A+PTR	83-136-61-59.wimax.bb.zain.com
83.136.61.73	A+PTR	83-136-61-73.wimax.bb.zain.com
83.136.61.73	A	ipdvr.name
83.136.61.116	A	83-136-61-116.wimax.bb.zain.com
83.136.61.176	A+PTR	83-136-61-176.wimax.bb.zain.com
83.136.61.185	A+PTR	83-136-61-185.wimax.bb.zain.com
83.136.61.188	A	83-136-61-188.rev.bb.zain.com
83.136.61.188	A	83-136-61-188.wimax.bb.zain.com
83.136.61.210	A+PTR	83-136-61-210.wimax.bb.zain.com
83.136.61.211	A+PTR	83-136-61-211.wimax.bb.zain.com
83.136.61.226	A+PTR	83-136-61-226.wimax.bb.zain.com
83.136.61.229	A	83-136-61-229.wimax.bb.zain.com
83.136.61.232	A+PTR	83-136-61-232.wimax.bb.zain.com
83.136.63.1	A+PTR	83-136-63-1.wimax.bb.zain.com
83.136.63.187	A+PTR	83-136-63-187.wimax.bb.zain.com
83.136.63.206	A	83-136-63-206.wimax.bb.zain.com
83.136.63.255	A	83-136-63-255.wimax.bb.zain.com