Robtex

Up: 80.253.128.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 80.253.132.0/23
Down right: 80.253.134.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
80.253.132.2	PTR	int0.client.access.fanaptelecom.net
80.253.132.3	PTR	int0.client.access.azadnet.net
80.253.132.4	PTR	int0.client.access.azadnet.net
80.253.132.5	PTR	int0.client.access.azadnet.net
80.253.132.6	PTR	int0.client.access.azadnet.net
80.253.132.7	PTR	int0.client.access.azadnet.net
80.253.132.8	PTR	int0.client.access.azadnet.net
80.253.132.9	PTR	int0.client.access.azadnet.net
80.253.132.10	PTR	int0.client.access.azadnet.net
80.253.132.11	PTR	int0.client.access.azadnet.net
80.253.132.12	PTR	int0.client.access.azadnet.net
80.253.132.13	PTR	int0.client.access.azadnet.net
80.253.132.14	PTR	int0.client.access.fanaptelecom.net
80.253.132.15	PTR	int0.client.access.azadnet.net
80.253.132.16	PTR	int0.client.access.azadnet.net
80.253.132.17	PTR	int0.client.access.azadnet.net
80.253.132.18	PTR	int0.client.access.azadnet.net
80.253.132.19	PTR	int0.client.access.azadnet.net
80.253.132.97	PTR	int0.client.access.azadnet.net
80.253.132.133	A	iranexpotourism.com
80.253.132.137	PTR	int0.client.access.azadnet.net
80.253.132.137	A	ittatour.com
80.253.132.139	A	netnew.ir
80.253.132.140	PTR	int0.client.access.fanaptelecom.net
80.253.132.147	PTR	int0.client.access.azadnet.net
80.253.132.157	PTR	int0.client.access.azadnet.net
80.253.132.157	A	rezakalhor.ir
80.253.132.158	PTR	int0.client.access.fanaptelecom.net
80.253.132.158	A	ns1.ittic.com
80.253.132.170	PTR	int0.client.access.fanaptelecom.net
80.253.132.179	PTR	int0.client.access.fanaptelecom.net
80.253.132.188	PTR	int0.client.access.azadnet.net
80.253.132.189	PTR	int0.client.access.azadnet.net
80.253.132.204	PTR	int0.client.access.azadnet.net
80.253.132.204	A	ns.shineh.com
80.253.132.206	PTR	int0.client.access.azadnet.net
80.253.132.206	A	rayanee.ac.ir
80.253.132.232	PTR	int0.client.access.fanaptelecom.net
80.253.132.234	PTR	mail.isa.ir
80.253.132.234	A	bkp-db48.jugoars.com
80.253.132.234	A	nsisa1.azadnet-site.net
80.253.132.235	PTR	mail.isa.ir
80.253.132.235	A	nsisa2.azadnet-site.net
80.253.132.235	A	ns.isa.ir
80.253.133.78	PTR	int0.client.access.fanaptelecom.net
80.253.133.107	PTR	int0.client.access.fanaptelecom.net
80.253.133.125	PTR	int0.client.access.azadnet.net
80.253.133.125	A	mail.jeyoil.com
80.253.133.136	PTR	int0.client.access.azadnet.net
80.253.133.137	PTR	int0.client.access.azadnet.net
80.253.133.137	A	mail1.bimehasia.ir
80.253.133.140	PTR	int0.client.access.fanaptelecom.net
80.253.133.140	A	www.bimehasia.com
80.253.133.140	A	bimehasia.com
80.253.133.202	PTR	int0.client.access.fanaptelecom.net
80.253.133.204	PTR	int0.client.access.fanaptelecom.net
80.253.133.206	PTR	int0.client.access.fanaptelecom.net
80.253.133.209	PTR	int0.client.access.fanaptelecom.net
80.253.135.2	A	*.dghongshuo.net
80.253.135.2	A	gamserver.gamelectronics.com
80.253.135.2	A	gam1.gamelectronics.com
80.253.135.5	PTR	int0.client.access.fanaptelecom.net
80.253.135.6	A	mail.triplociti.com
80.253.135.6	A	mail1.gamelectronics.com
80.253.135.51	PTR	int0.client.access.azadnet.net
80.253.135.55	PTR	int0.client.access.azadnet.net
80.253.135.57	PTR	int0.client.access.fanaptelecom.net
80.253.135.66	PTR	gsi-gc.ir
80.253.135.87	PTR	int0.client.access.azadnet.net
80.253.135.112	PTR	int0.client.access.azadnet.net
80.253.135.112	A	www.fixsho.ir
80.253.135.112	A	ns2.fixsho.ir
80.253.135.115	PTR	int0.client.access.azadnet.net
80.253.135.119	A	mail.arka-games.com
80.253.135.131	PTR	int0.client.access.fanaptelecom.net
80.253.135.141	PTR	int0.client.access.fanaptelecom.net
80.253.135.151	PTR	int0.client.access.fanaptelecom.net
80.253.135.161	PTR	int0.client.access.fanaptelecom.net
80.253.135.184	PTR	int0.client.access.azadnet.net
80.253.135.185	PTR	int0.client.access.fanaptelecom.net
80.253.135.192	PTR	int0.client.access.fanaptelecom.net
80.253.135.193	PTR	int0.client.access.azadnet.net
80.253.135.199	PTR	int0.client.access.azadnet.net
80.253.135.202	PTR	int0.client.access.azadnet.net
80.253.135.202	A	armanins.com
80.253.135.211	A	orzhance.com
80.253.135.222	PTR	int0.client.access.fanaptelecom.net
80.253.135.232	PTR	int0.client.access.azadnet.net
80.253.135.242	PTR	int0.client.access.azadnet.net
80.253.135.255	PTR	int0.client.access.azadnet.net