Robtex

Up: 121.244.140.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 121.244.142.0/24
Down right: 121.244.143.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
121.244.142.5	PTR	121.244.142.5.static-delhi.vsnl.net.in
121.244.142.201	PTR	121.244.142.201.static-delhi.vsnl.net.in
121.244.143.5	A	mx4.navconsulting.net
121.244.143.5	A	mx4.navcayman.net
121.244.143.5	A	mx4.navfundservices.net
121.244.143.10	A+PTR	nsdhelpdesk.navbackoffice.com
121.244.143.10	A	ns1.navconsulting.net
121.244.143.11	A+PTR	webmail.ramansujatisamaj.com
121.244.143.11	A	ramansujatisamaj.com
121.244.143.21	A	webmail.navbackoffice.com
121.244.143.22	A	mail.navbackoffice.com