Robtex

Up: 123.136.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 123.136.16.0/23
Down right: 123.136.18.0/23

IP	Type	Hostname
123.136.16.25	A	yessecuritiesltd.in
123.136.18.21	A	yesmobilenext.yesbank.in
123.136.18.30	A	sdns.yesbank.in
123.136.18.62	A	livechat.yesbank.in
123.136.18.66	A	sftp.yesbank.in
123.136.18.80	A+PTR	mx2.yesbank.in
123.136.18.81	A+PTR	mx.yesbank.in
123.136.18.81	A+PTR	mx.yessecuritiesltd.in
123.136.18.82	A+PTR	mx1.yesbank.in
123.136.18.82	PTR	mx1.yessecuritiesltd.in
123.136.18.83	PTR	autodiscover.yesbank.in
123.136.18.83	PTR	webmail.yessecuritiesltd.in
123.136.19.61	A	yes.bank
123.136.19.62	A	aof.yesbank.in
123.136.19.67	A	collection.yesbank.in
123.136.19.69	A	dcadns.yesbank.in
123.136.19.70	A	talentacquisition.yesbank.in
123.136.19.72	A	netbanking.yesbank.co.in
123.136.19.77	A	branch.yesbank.in
123.136.19.90	A	sky.yesbank.in
123.136.19.91	A	uatsky.yesbank.in
123.136.19.114	A	upi.yesbank.in