Robtex

Up: 217.11.28.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 217.11.28.0/25
Down right: 217.11.28.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
217.11.28.20	PTR	mail.jpdrg.com
217.11.28.20	PTR	mail.karoonroad.com
217.11.28.20	A	mail.sandalibartar.com
217.11.28.22	PTR	jpdrg.com
217.11.28.22	A	mail.xn--ccke6ab2a0ewc4qj27vehgc93ldk6a94u.net
217.11.28.70	A+PTR	mail.sazman-sama.org
217.11.28.93	A	javanirani.ir
217.11.28.93	A	javananeirani.ir
217.11.28.93	A	www.javananeirani.ir
217.11.28.98	A+PTR	mail.msy.gov.ir
217.11.28.170	PTR	mail.aryamasir.com
217.11.28.171	A	rustyfx.com
217.11.28.171	A	mail.aryamasir.com
217.11.28.197	A	ircodal.ir
217.11.28.202	PTR	webmail.tashradiator.com
217.11.28.203	A	mail.tash.com