Robtex

Up: 217.66.208.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 217.66.212.0/23
Down right: 217.66.214.0/23

IP	Type	Hostname
217.66.212.2	PTR	int0.client.access.fanaptelecom.net
217.66.212.93	PTR	int0.client.access.fanaptelecom.net
217.66.212.138	PTR	int0.client.access.fanaptelecom.net
217.66.212.138	A	mail.karamadbc.com
217.66.212.147	A	mail2.agahmail.com
217.66.212.163	PTR	int0.client.access.fanaptelecom.net
217.66.212.172	A	mail.hamrahshop.com
217.66.212.172	A	*.hamrahshop.com
217.66.212.198	A	mail.musicmuseum.ir
217.66.212.198	A	ns1.musicmuseum.ir
217.66.212.198	A	musicmuseum.ir
217.66.212.199	A	ns2.musicmuseum.ir
217.66.212.200	PTR	int0.client.access.fanaptelecom.net
217.66.212.203	PTR	int0.client.access.fanaptelecom.net
217.66.212.243	PTR	int0.client.access.fanaptelecom.net
217.66.213.25	PTR	int0.client.access.fanaptelecom.net
217.66.213.62	PTR	int0.client.access.fanaptelecom.net
217.66.213.81	A+PTR	mx1.deltathrco.com
217.66.213.81	A	mx2.deltathrco.com
217.66.213.82	A+PTR	mx2.deltathrco.com
217.66.213.89	A	mail.globaldxb.com
217.66.213.90	A	mail.gulfgatedxb.com
217.66.213.130	PTR	int0.client.access.fanaptelecom.net
217.66.213.130	A	10gtc.com
217.66.213.155	PTR	mail.zeitgeistgmbh.de
217.66.213.155	PTR	mail.conship.biz
217.66.213.155	PTR	mail.persiangroup.biz
217.66.213.196	PTR	int0.client.access.fanaptelecom.net
217.66.213.201	A+PTR	mail.tehrancement.co.ir
217.66.213.225	A+PTR	mail.nahavandcement.com
217.66.213.238	PTR	int0.client.access.fanaptelecom.net
217.66.215.18	PTR	int0.client.access.fanaptelecom.net
217.66.215.35	A	ns2.hadithcity.ir
217.66.215.71	PTR	int0.client.access.fanaptelecom.net
217.66.215.71	A	smtp.mapnagenerator.com
217.66.215.72	A	mail.mapnagenerator.com
217.66.215.198	PTR	int0.client.access.fanaptelecom.net