Robtex

Up: 203.123.136.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 203.123.138.0/24
Down right: 203.123.139.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.123.139.41	PTR	thdc-139-41.static.pacific.net.in
203.123.139.107	A	mkclmum.mkcl.biz
203.123.139.157	PTR	mail.askgroup.in
203.123.139.157	A	mx3.asksecurities.com
203.123.139.157	A	mx3.asitkotichafoundation.in
203.123.139.170	PTR	hettich-139-170.static.pacific.net.in
203.123.139.171	PTR	hetich-139-171.static.pacific.net.in
203.123.139.213	PTR	lease213.mumbai-139.static.pacific.net.in
203.123.139.227	PTR	mail.spcmg.co.in