Robtex

Up: 121.244.32.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 121.244.32.0/25
Down right: 121.244.32.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
121.244.32.117	A+PTR	mx1.pub.modi.com
121.244.32.118	PTR	mx2.pub.modi.com
121.244.32.118	A	smtp1.pub.modi.com
121.244.32.118	A	smtp3.pub.modi.com
121.244.32.130	PTR	121.244.32.130.static-mumbai.vsnl.net.in
121.244.32.210	PTR	121.244.32.210.static-mumbai.vsnl.net.in
121.244.32.242	PTR	121.244.32.242.static-mumbai.vsnl.net.in