Robtex

Up: 176.221.64.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 176.221.68.0/23
Down right: 176.221.70.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
176.221.68.2	PTR	int0.client.access.fanaptelecom.net
176.221.68.2	A	ns1.yadman.ir
176.221.68.2	A	mail.yadman.ir
176.221.69.58	PTR	176.221.69.58.iauet.ac.ir
176.221.69.62	PTR	176.221.69.62.iauet.ac.ir
176.221.69.62	A	smtp.mandegar.com
176.221.69.62	A	mail.mandegar.com
176.221.69.124	A	demo2.spooler.ir
176.221.69.125	PTR	int0.client.access.fanaptelecom.net
176.221.69.125	A	ezknow.ir
176.221.69.192	PTR	int0.client.access.fanaptelecom.net
176.221.69.193	PTR	int0.client.access.fanaptelecom.net
176.221.69.196	PTR	int0.client.access.fanaptelecom.net
176.221.69.208	PTR	int0.client.access.fanaptelecom.net
176.221.69.208	A	keybod.com
176.221.69.216	A	fanapium.com
176.221.69.223	PTR	int0.client.access.fanaptelecom.net
176.221.70.2	PTR	int0.client.access.fanaptelecom.net
176.221.71.2	PTR	int0.client.access.fanaptelecom.net
176.221.71.2	A	ns1.tehranedu16.ir
176.221.71.2	A	ns1.tehranedu14.ir
176.221.71.3	PTR	int0.client.access.fanaptelecom.net
176.221.71.4	PTR	int0.client.access.fanaptelecom.net
176.221.71.4	A	ns3.tsch.ir
176.221.71.4	A	ns3.tehranedu4.ir
176.221.71.110	PTR	int0.client.access.fanaptelecom.net
176.221.71.110	A	mail.tehranedu.ir
176.221.71.110	A	kohnhorst.de
176.221.71.112	A	tmsteel.com
176.221.71.112	A	mail.casinowv.com
176.221.71.112	A	geelongacupuncture.com
176.221.71.113	PTR	int0.client.access.fanaptelecom.net