Robtex

Up: 89.221.80.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 89.221.80.0/23
Down right: 89.221.82.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
89.221.80.5	PTR	mail.borna-eng.ir
89.221.80.5	A	mail.bornagostaran.ir
89.221.80.5	A	mail.absharbell.com
89.221.80.10	A	ns1.ofogh.net
89.221.81.31	A	bro.ir
89.221.81.68	A	qazvin.beest.ir
89.221.81.69	A	shahidbehnam.ir
89.221.81.70	A	raci.ir
89.221.81.83	A	basijkargari.ir
89.221.81.97	PTR	mail.bornapardaz.ir
89.221.81.97	A	ns2.member-list.com
89.221.81.97	A	mail2.bornapardaz.com
89.221.81.102	A	basij.ir
89.221.81.107	A+PTR	mail.igc-ir.com
89.221.81.107	A	mail.igc.ir
89.221.81.108	A+PTR	smtp.igc-ir.com
89.221.81.108	A	smtp.igc.ir
89.221.81.118	A	serajnet.ir
89.221.81.142	A	dsrc.ir
89.221.81.145	A	mx1.sepahnews.com
89.221.81.180	A	snn.ir
89.221.81.189	PTR	mail.breathco.ir
89.221.81.189	A	tashrifat-monaco.com
89.221.81.189	A	heartgenedata.com
89.221.82.17	A	mail.dayins.com
89.221.82.68	A	dayfestival.ir
89.221.82.129	PTR	mail.fanava.net
89.221.82.133	PTR	fanava.net
89.221.83.101	A	masjed.drhost.name
89.221.83.102	A	mail.eduinf.org
89.221.83.102	A	eduinf.org
89.221.83.103	PTR	dlsgroup.asia
89.221.83.103	PTR	dlsco.ir
89.221.83.103	PTR	ie70.ir
89.221.83.104	A	mail.sgg.co.ir
89.221.83.105	A	mail.medosopher.com
89.221.83.105	A	bahmaninsurance.com
89.221.83.105	A	mail.yadegartarh.com
89.221.83.110	A	skc.co.ir
89.221.83.110	A	ns.pishkesvat.ir
89.221.83.110	A	mail.samanehkish.ir
89.221.83.204	A+PTR	hadjarian.com
89.221.83.204	PTR	hajarian.com
89.221.83.204	PTR	hadjarian.info
89.221.83.205	A+PTR	bahmaninsurance.com
89.221.83.205	PTR	medosopher.com
89.221.83.205	PTR	yadegartarh.com
89.221.83.207	PTR	hrmsociety.ir
89.221.83.207	PTR	pishkesvat.ir
89.221.83.207	PTR	samanehkish.ir
89.221.83.242	A	aiin.ir
89.221.83.244	A	seo1.simorgh34000.com