Robtex

Up: 223.30.0.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 223.30.0.0/22
Down right: 223.30.4.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
223.30.0.0	PTR	segment-223-30.sify.net
223.30.1.0	PTR	segment-223-30.sify.net
223.30.1.58	PTR	segment-223-30.sify.net
223.30.1.66	PTR	segment-223-30.sify.net
223.30.1.75	PTR	segment-223-30.sify.net
223.30.1.106	A	devmca.irisbusiness.com
223.30.1.112	PTR	segment-223-30.sify.net
223.30.1.129	PTR	segment-223-30.sify.net
223.30.1.146	A	mail1.irisindia.net
223.30.1.161	PTR	segment-223-30.sify.net
223.30.1.170	PTR	segment-223-30.sify.net
223.30.1.176	PTR	segment-223-30.sify.net
223.30.1.219	PTR	segment-223-30.sify.net
223.30.2.0	PTR	segment-223-30.sify.net
223.30.2.10	PTR	segment-223-30.sify.net
223.30.2.81	PTR	segment-223-30.sify.net
223.30.2.81	A	mail.rebackoffice.com
223.30.2.81	A	mail.surmountenergy.com
223.30.2.82	A	ezsense.in
223.30.2.83	PTR	hosting1.maxval.net
223.30.2.85	A	mail.buildtrack.in
223.30.2.88	A	bellevertcounty.com
223.30.2.89	A	mail.rebackoffice.com
223.30.2.92	A	construct-in-3d.com
223.30.2.138	PTR	segment-223-30.sify.net
223.30.2.140	A	travelatease.co.in
223.30.2.163	PTR	segment-223-30.sify.net
223.30.2.187	PTR	segment-223-30.sify.net
223.30.3.0	PTR	segment-223-30.sify.net
223.30.3.26	PTR	segment-223-30.sify.net
223.30.3.76	A	mail1.prismcement.com
223.30.3.76	A	mail.prismcement.com
223.30.3.130	PTR	segment-223-30.sify.net
223.30.3.249	PTR	segment-223-30.sify.net
223.30.4.0	PTR	segment-223-30.sify.net
223.30.5.0	PTR	segment-223-30.sify.net
223.30.5.16	PTR	segment-223-30.sify.net
223.30.5.114	PTR	segment-223-30.sify.net
223.30.6.0	PTR	segment-223-30.sify.net
223.30.6.105	PTR	segment-223-30.sify.net
223.30.6.168	PTR	segment-223-30.sify.net
223.30.6.202	A	stxavierspatna.com
223.30.6.202	A	acceltechindia.com
223.30.7.19	PTR	segment-223-30.sify.net
223.30.7.177	PTR	segment-223-30.sify.net
223.30.7.226	A+PTR	mail.dspcoopbank.com
223.30.7.226	A+PTR	dspcoopbank.com
223.30.7.226	A	smtp.dspcoopbank.com
223.30.7.242	A	masspl.co.in
223.30.7.245	A	mail.masspl.in