Robtex

Up: 81.28.48.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 81.28.56.0/22
Down right: 81.28.60.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
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
81.28.60.94	A	isc.org.ir