Robtex

Up: 81.31.192.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 81.31.224.0/20
Down right: 81.31.240.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.31.224.4	A+PTR	mail.chapar.net
81.31.224.5	A+PTR	ns2.chapar.net
81.31.224.43	PTR	mail.ramonashk.ir
81.31.224.43	PTR	server.mahsan.net
81.31.224.43	A	mail.comcenter.ir
81.31.224.44	PTR	speedtest2.chapar.net
81.31.224.44	PTR	speedtest1.chapar.net
81.31.224.108	A+PTR	mail2.rayanmehr.co.ir
81.31.224.108	A	mail.rayanmehr.org
81.31.224.141	A	assistance.emdadkhodro.com
81.31.224.194	A+PTR	ns1.chapar.net
81.31.224.194	A	windsbeat.com
81.31.224.198	PTR	2950.chapar.net
81.31.224.198	PTR	2950winet.chapar.net
81.31.224.198	PTR	ahmadreza.chapar.net
81.31.225.130	A	nat83.eonmediainc.com
81.31.225.130	A	kaylagroup.kaylagroup.com
81.31.225.130	A	mail.kaylagroup.com
81.31.225.150	PTR	server.brnit.com
81.31.225.226	A+PTR	samelectronic.com
81.31.225.226	A	ns1.samelectronic.com
81.31.225.226	A	ns0.samelectronic.com
81.31.225.245	A	mail.samelectronic.com
81.31.227.68	A+PTR	novinmehr.ir
81.31.227.68	A+PTR	mail.novinmehr.ir
81.31.227.68	A+PTR	www.novinmehr.ir
81.31.227.76	A	mail.bahartel.ir
81.31.228.2	A	mail.drangedaleverk.no
81.31.228.126	A	mail.pertho.no
81.31.228.126	A	mail.annebirgittes.no
81.31.230.67	A	hepl.ir
81.31.230.67	A	*.hepl.ir
81.31.230.67	A	www.hepl.ir
81.31.230.68	A	www.hosseiniehershad.ir
81.31.230.198	PTR	email.apache.ir
81.31.231.20	A	ns1.kara-net.ir
81.31.231.21	A	mail.kara-net.ir
81.31.231.21	A	ns2.kara-net.ir
81.31.233.5	PTR	mail.khatam.ac.ir
81.31.233.17	A	optikernyhus.no
81.31.233.117	A	www.096440.com
81.31.234.6	A	server2.dataservice.no
81.31.234.6	A	mail.rjukan.vgs.no
81.31.234.34	A+PTR	mail.kaylagroup.com
81.31.234.130	A	skittjakt.no
81.31.235.4	A	ns1.majmaomoorsenfi.com
81.31.235.5	A	newgenerationmilitia.com
81.31.235.5	A	ns2.majmaomoorsenfi.com
81.31.235.6	A	ns2.majmaomoorsenfi.com
81.31.235.6	A	majmaomoorsenfi.com
81.31.235.66	A	mail.sikkersone.no
81.31.235.131	PTR	irgoldline.com
81.31.235.131	A+PTR	www.irgoldline.com
81.31.235.131	A	www.83851.ir
81.31.235.184	A	www.nazm.net
81.31.235.220	A+PTR	ns1.83851.ir
81.31.235.220	A	217-140-130-62.aina.net
81.31.235.221	A+PTR	ns2.83851.ir
81.31.235.221	A	hccparking.net
81.31.235.229	A	ns2.joof.ir
81.31.235.229	A	artaexpo.com
81.31.235.229	A	mail.artaexpo.com
81.31.236.12	A	mail.olgou.ir
81.31.236.13	A	olgou.ir
81.31.236.13	A	www.olgou.ir
81.31.236.13	A	moii.ir
81.31.236.77	A	webmail.iranatlaskish.ir
81.31.236.78	A	ns1.iranatlaskish.com
81.31.236.89	A	mail.shuttlepars.com
81.31.236.89	A	mail.pipars.com
81.31.236.139	A	email.shivaatlas.com
81.31.236.230	A+PTR	mail.etebarsanjisaman.com
81.31.236.230	PTR	smtp.etebarsanjisaman.com
81.31.236.231	A	ns2.etebarsanjisaman.com
81.31.236.231	A	ns1.icbs.ir
81.31.236.239	A	etebarsanjisaman.com
81.31.236.244	PTR	mail.icbs.ir
81.31.237.186	A	ns2.rayanmehr.org
81.31.238.13	A	mailsrv.setarehatlaspars.com
81.31.238.13	A	mail.setarehatlaspars.com
81.31.238.26	A	mail.joof.ir
81.31.238.26	A	mail.tolidat.ir
81.31.238.35	A	joof.ir
81.31.238.36	A	mail.artaexpo.com
81.31.238.42	A	ns1.mkazemi.com
81.31.238.43	A	ns2.mkazemi.com
81.31.238.229	A	ns.artaexpo.com
81.31.242.130	A	mothersite.ir
81.31.242.130	A	ns.mothersite.ir
81.31.244.2	A	kiananet.net
81.31.244.2	A	arma-co.ir
81.31.244.5	A	mail.kiananet.net
81.31.244.7	A+PTR	ns1.kiananet.net
81.31.244.8	PTR	ns2.kiananet.net
81.31.245.11	A	www2.taminn.org
81.31.245.15	A	www.sso.ir
81.31.245.15	A	ixs20.com
81.31.245.15	A	*.dugong.org
81.31.245.65	A	bos.amateur--sex.com
81.31.245.132	A	www.moavenatdarman.sso.ir
81.31.245.139	A	irinp.net
81.31.245.139	A	irinews.net
81.31.245.139	A	khorshidpress.com
81.31.246.121	A	mail.snowshoes-event.ch
81.31.246.121	A	mail.farzanegan3-karaj.ir
81.31.247.35	A	mail.scana.no
81.31.247.181	A	hassaneini.ir
81.31.248.178	PTR	chapar.net
81.31.248.178	PTR	www.chapar.net
81.31.248.178	A	mail.shaberco.ir
81.31.249.198	A+PTR	mail.mzp.co.ir
81.31.249.198	A	ns1.mzp.co.ir
81.31.249.198	A	exchange.mzp.co.ir
81.31.249.200	A	www.mzp.co.ir
81.31.249.227	A	echargepanel.com
81.31.249.228	A	web4.rayanmehr.org
81.31.249.229	A	89714.ir
81.31.249.229	A	rayanmehr.biz
81.31.249.230	A	echargepanel.com
81.31.250.2	A+PTR	my.83851.ir
81.31.252.33	A	hassaneini.ir
81.31.252.171	A	mail2.traumacranienfc.org
81.31.253.78	A	a313.dnsd.info
81.31.253.78	A	a313.ddns01.com
81.31.253.246	A	mixture.ignorelist.com
81.31.254.9	A	ndco.ir
81.31.254.11	A	ns1.ndco.ir