Robtex

Up: 121.243.16.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 121.243.16.0/22
Down right: 121.243.20.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
121.243.16.210	A+PTR	relay.go4hosting.in
121.243.16.210	A	newsletter1.go4hosting.in
121.243.16.211	A	relay.go4hosting.in
121.243.16.212	A	relay.go4hosting.in
121.243.16.214	A	ns22.goforhosting.com
121.243.16.214	A	mailgateway.cyfuture.com
121.243.17.2	PTR	121.243.17.2.static-delhi.vsnl.net.in
121.243.18.2	PTR	121.243.18.2.static-delhi.vsnl.net.in
121.243.19.43	PTR	121.243.19.43.static-delhi.vsnl.net.in
121.243.19.80	PTR	121.243.19.80.static-delhi.vsnl.net.in
121.243.19.136	PTR	121.243.19.136.static-delhi.vsnl.net.in
121.243.19.139	PTR	121.243.19.139.static-delhi.vsnl.net.in
121.243.19.162	PTR	121.243.19.162.static-delhi.vsnl.net.in
121.243.19.219	PTR	121.243.19.219.static-delhi.vsnl.net.in
121.243.22.130	PTR	121.243.22.130.static-delhi.vsnl.net.in
121.243.22.135	A	vmscanus.firstnaukri.com
121.243.22.135	A	vmscanus.motozig.com
121.243.22.135	A	vmscanus.naukri.com
121.243.22.140	A	avasin.motozig.com
121.243.22.140	A	avasin.jeevansathimatchpoint.com
121.243.22.140	A	avasin.infoedge.com
121.243.22.144	PTR	avasin.naukri.com
121.243.22.145	PTR	avasin.naukri.com
121.243.22.150	PTR	delhtca03.naukri.com
121.243.22.150	A	exht01.infoedge.com
121.243.22.151	PTR	delhtca03.naukri.com
121.243.22.151	A	exht01.infoedge.com
121.243.22.151	A	resumeservices.naukri.com
121.243.22.152	A+PTR	excas1.infoedge.com
121.243.22.152	A	delhtca02.naukri.com
121.243.22.153	A	delhtca02.naukri.com
121.243.22.153	A	excas1.infoedge.com
121.243.22.156	A	exht02.infoedge.com
121.243.22.156	A	delhtca05.naukri.com
121.243.22.157	A	exht02.infoedge.com
121.243.22.157	A	delhtca05.naukri.com
121.243.22.169	PTR	noidambx01.infoedge.com
121.243.22.169	A	excas2.infoedge.com
121.243.22.171	PTR	121.243.22.171.static-delhi.vsnl.net.in
121.243.22.171	A	mail01.strikebig.info
121.243.22.171	A	resumepedia.naukri.com
121.243.22.172	A	mail.strikebig.net
121.243.22.176	PTR	121.243.22.176.static-delhi.vsnl.net.in
121.243.22.176	A	autodiscover.naukri.com
121.243.22.176	A	mail.infoedge.com
121.243.22.178	A	excas2.infoedge.com
121.243.22.230	A	ns2.niit-tech.in
121.243.22.231	A	ns1.niit-tech.in
121.243.22.231	A	noida-ch-dns1.niit-tech.in
121.243.22.233	PTR	mail.niit-tech.com
121.243.22.238	A	mail3.niit-tech.com
121.243.22.239	A	mail4.niit-tech.com
121.243.22.241	A	careers.niit-tech.com
121.243.22.250	PTR	121.243.22.250.static-delhi.vsnl.net.in
121.243.22.250	A	llb1dc.niit-tech.com
121.243.22.253	A	mail3.niit-tech.in