Robtex

Up: 203.76.128.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 203.76.128.0/23
Down right: 203.76.130.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.76.128.98	A	mail2.emersonclimatetechindia.com
203.76.128.126	A	rptechindia.co.in
203.76.128.164	A	lp1.suzlon.com
203.76.128.175	PTR	suzlonsmtp.suzlon.com
203.76.128.180	A+PTR	email1.suzlon.com
203.76.128.180	A	mail1.tantiholdings.com
203.76.128.180	A	mailx1.suzlon.com
203.76.129.60	PTR	agimail.agi-glaspac.com
203.76.129.60	PTR	agimail.agiclozures.com
203.76.130.77	A+PTR	tikona.infinetmessaging.com
203.76.130.77	A	infinetmessaging.com
203.76.131.66	A+PTR	firewall.sss-india.com
203.76.131.68	PTR	mail1.sss-india.com
203.76.131.69	A+PTR	mail.sss-india.com
203.76.131.250	PTR	mail.amararaja.co.in