Robtex

Up: 203.212.192.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 203.212.192.0/25
Down right: 203.212.192.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.212.192.20	A	mx.hathway.com
203.212.192.21	A+PTR	pop.hcspl.net
203.212.192.21	A	pop.hathway.com
203.212.192.22	A+PTR	pop.hathway.net
203.212.192.22	A	mail.hathway.net
203.212.192.22	A	imap.hathway.net
203.212.192.30	PTR	mail.hcspl.net
203.212.192.30	A	smtp2.hathway.com
203.212.192.30	A	bangsmtp.hathway.com
203.212.192.31	A+PTR	smtp.hcspl.net
203.212.192.32	A	smtpnet.hathway.com
203.212.192.33	A	antispam3.hathway.com
203.212.192.34	PTR	as2.hathway.com
203.212.192.34	A	antispam.hathway.com
203.212.192.46	A+PTR	mail7.hathwayconnect.net
203.212.192.55	PTR	webmail.hathway.net
203.212.192.55	A+PTR	mail.hathway.net
203.212.192.134	A	www.denbroadband.in
203.212.192.225	A+PTR	mx1.hathway.com
203.212.192.225	A	as3.hathway.com
203.212.192.225	A	as2.hathway.com
203.212.192.226	A+PTR	mx2.hathway.com
203.212.192.231	A+PTR	mail7.hathwayconnect.net
203.212.192.232	A	mail.globusmail.com
203.212.192.240	A+PTR	corpsmtp.hathway.net
203.212.192.240	PTR	smtp.rraheja.com