Robtex

Up: 81.31.128.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 81.31.160.0/20
Down right: 81.31.176.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.31.160.1	A	router.sharif.ac.ir
81.31.160.26	A	webcache.sharif.ir
81.31.160.34	A+PTR	ns1.sharif.ir
81.31.160.34	A	ns1.sharif.ac.ir
81.31.160.34	A	pars.sharif.ir
81.31.160.35	PTR	homa.sharif.ir
81.31.160.39	A	sharif.ac.ir
81.31.160.129	PTR	ge8-48.vl7.core-router.sharif.edu
81.31.160.130	A+PTR	amin.sharif.edu
81.31.160.132	A	www.bonyad.ir
81.31.160.132	A	bonyad.ir
81.31.160.133	A+PTR	mx3.sharif.edu
81.31.162.10	PTR	webhosting.sharif.ir
81.31.162.10	A	merc.sharif.ir
81.31.162.10	A	seri.sharif.ac.ir
81.31.162.254	A+PTR	cvl-cat.sharif.ir
81.31.163.3	PTR	ee.sharif.ir
81.31.163.254	A	ee-cat.sharif.ir
81.31.164.3	PTR	ce.sharif.edu
81.31.164.254	A+PTR	ce-cat.sharif.edu
81.31.165.178	PTR	ae.sharif.ir
81.31.165.254	A+PTR	elec-cat.sharif.ir
81.31.166.85	PTR	math.sharif.ir
81.31.166.89	A	mathscilab.sharif.edu
81.31.166.181	A	sharifmathjournal.ir
81.31.166.181	A	mx.sharifmathjournal.ir
81.31.166.192	A	math.sharif.edu
81.31.166.192	A	math.sharif.ac.ir
81.31.166.192	A	23.80.29-static.reverse.softlayer.com
81.31.166.251	PTR	proxy.ie.sharif.ir
81.31.166.252	PTR	ie.sharif.ir
81.31.166.254	A	math-cat.sharif.ir
81.31.167.253	A+PTR	lib-cat.sharif.ir
81.31.167.253	A	tacticalout.info
81.31.167.254	A+PTR	edu-cat.sharif.ir
81.31.168.10	A	math.sharif.edu
81.31.168.20	A	cw.sharif.edu
81.31.168.62	A	www.srmc.ir
81.31.168.63	A	icpc.ir
81.31.168.75	A	naadsecure.ir
81.31.168.75	A	a.ns.naadsecure.ir
81.31.168.75	A	www.naadsecure.ir
81.31.168.156	A	che.sharif.ac.ir
81.31.168.170	A	ramznet.ir
81.31.168.170	A	www.ramznet.ir
81.31.168.203	A	irecommend.ir
81.31.168.206	A	ssc.ce.sharif.edu
81.31.168.213	A	prim1.dcdn.ir
81.31.168.220	A	afra-watergy.com
81.31.168.224	A	sharifstar.ir
81.31.168.225	A	elitland.ir
81.31.168.225	A	api.salamcinama.ir
81.31.168.225	A	salamcinama.ir
81.31.170.24	A	ee.sharif.edu
81.31.170.34	A	ie.sharif.edu
81.31.170.50	A+PTR	che.sharif.ir
81.31.170.50	A	che.sharif.edu
81.31.170.254	A+PTR	che-cat.sharif.ir
81.31.174.213	PTR	ee.sharif.ir
81.31.176.173	A	www.sabbaghian.ir
81.31.178.60	PTR	mech.sharif.edu
81.31.180.9	A	tallan.ir
81.31.180.9	A	sharifstudent.ir
81.31.180.9	A	i-quran.ir
81.31.180.64	A	salary.sharif.edu
81.31.182.3	PTR	gsme.sharif.ir
81.31.182.186	A	ns1.ekarafarini.com
81.31.183.3	PTR	physics.sharif.ir
81.31.185.25	A	angular.ir
81.31.185.25	A	amidrayaneh.ir
81.31.186.13	A	rottler.mobi
81.31.186.17	A+PTR	mail.sharif.edu
81.31.186.17	A+PTR	mail.sharif.ir
81.31.186.17	A	mail.sharif.ac.ir
81.31.186.38	A+PTR	lists.sharif.edu
81.31.186.38	A+PTR	lists.sharif.ir
81.31.186.47	A	mx2.sharif.ac.ir
81.31.186.54	A	sharif.ac.ir
81.31.188.3	A+PTR	ch.sharif.ir
81.31.188.3	A	ch.sharif.ac.ir
81.31.191.3	A	isargaran.sharif.ir