Robtex

Up: 81.28.0.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 81.28.32.0/20
Down right: 81.28.48.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.28.32.1	PTR	fe0.0.jupiter.lude.isiran.com
81.28.32.3	PTR	fe0.0.pluto.lude.isiran.com
81.28.32.34	PTR	ns2.isiran.com
81.28.32.36	A	fw1a.punterbonus.com
81.28.32.36	A	cmrssurveys.org
81.28.32.36	A	pokerstarsatlantic.net
81.28.32.64	A	www.iaci.ir
81.28.32.67	A	l0vr.ayfph.cn
81.28.32.67	A	buscaprev.com.br
81.28.32.67	A	server3.isiran.com
81.28.32.74	A	lms.isilearning.ir
81.28.32.103	A	sakhaja.com
81.28.32.103	A	sakha.ir
81.28.32.162	PTR	amlthea.jupiter.lude.isiran.com
81.28.33.66	A	kundeninformationen.ch
81.28.33.66	A	smtp.aio.ir
81.28.33.66	A	smtp.isibook.ir
81.28.34.1	PTR	core.isiran.com
81.28.34.23	A	www.cogtes.ir
81.28.34.23	A	cogtes.ir
81.28.34.25	A	hesa.ir
81.28.34.30	A	www.ieisp.ir
81.28.34.40	A	omraniran.ir
81.28.34.40	A	www.omraniran.ir
81.28.34.41	A	tbao.ir
81.28.34.75	A	fajr-hospital.ir
81.28.34.89	A	icig.ir
81.28.34.89	A	www.icig.ir
81.28.34.92	A	www.iaio.ir
81.28.34.98	A	www.esamta.ir
81.28.34.98	A	esamta.ir
81.28.34.102	A	irangarment.ir
81.28.34.102	A	www.irangarment.ir
81.28.34.130	A	www.scsc.ir
81.28.34.132	A	iaci.ir
81.28.34.134	A	www.iricert.ir
81.28.34.134	A	iricert.org
81.28.34.156	A	esamta.ir
81.28.34.161	A	mail.dafoosaja.ac.ir
81.28.34.161	A	mail.aja.ir
81.28.34.178	A	mail.esata.ir
81.28.34.178	A	www.eci-company.com
81.28.34.192	A	www.tademam.ir
81.28.34.192	A	tademam.ir
81.28.34.193	PTR	fe0.1.15.pluto.gharani.wi.lude.isiran.com
81.28.34.193	A	www.hamilms.ir
81.28.34.193	A	hamilms.ir
81.28.34.224	A	ioico.ir
81.28.34.224	A	www.ioico.ir
81.28.34.228	A	isilearning.ir
81.28.34.228	A	lms.isilearning.ir
81.28.34.233	A	tbao.ir
81.28.36.66	A	xn--weinblte-c6a.com
81.28.36.131	A	samincard.com
81.28.36.133	A	publicinternetaddress.isipayment.ir
81.28.36.230	A	saafta.net
81.28.36.230	A	iran-cert.com
81.28.36.231	A	www.scitco.ir
81.28.36.231	A	mahar.scitco.ir
81.28.36.233	PTR	mail.scitco.ir
81.28.37.164	A	ghblogtest1.info
81.28.37.164	A	*.zhuimengpai.com
81.28.37.164	A	lovehonour.com
81.28.41.12	A	mail.rahvar120.ir
81.28.44.3	A	webmail.edalatara.com
81.28.44.3	A	webmail.dana.ofogh.net
81.28.44.3	A	email.ofogh.ir
81.28.44.17	A	mail.basijian.net
81.28.44.40	A	danastat.ir
81.28.44.40	A	hadi.ofogh.net
81.28.44.46	A	basirat1.ofogh.net
81.28.44.46	A	malaek.ofogh.net
81.28.48.75	A	mail.sacompany.org
81.28.48.75	A	mail.ieicorp.com
81.28.48.75	A	mail.fadjrfactory.ir
81.28.48.93	A	smtp.payammail.ir
81.28.52.2	A	ns2.isiran.com
81.28.59.14	A	smtp.aja.ir
81.28.59.163	A	cyberpolice.ir
81.28.60.81	A	smtp.payammail.ir
81.28.60.83	PTR	smtp.isiran-net.com
81.28.60.83	PTR	smtp.beasat.ir
81.28.60.83	PTR	smtp.omid-iri.ir