Robtex

Up: 125.19.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 125.19.16.0/23
Down right: 125.19.18.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
125.19.16.202	A	swaraup.gov.in
125.19.17.6	PTR	imss.bharti.com
125.19.17.6	A+PTR	imss.airtel.in
125.19.17.6	A+PTR	mx2.airtel.lk
125.19.17.9	A+PTR	appsmailgw.airtel.in
125.19.17.10	A+PTR	northmailgw.airtel.in
125.19.17.13	A	vpn.airtel.in
125.19.17.13	A	workfromhome.airtel.in
125.19.17.14	A+PTR	secureportal.airtel.in
125.19.17.15	A+PTR	collection.airtel.in
125.19.17.19	PTR	smtp.airtel-vodafone.gg
125.19.17.19	PTR	smtp.airtel-vodafone.je
125.19.17.20	A+PTR	www.airtel-broadband.com
125.19.17.20	PTR	www.airtelenterprise.com
125.19.17.20	PTR	www.airtellive.com
125.19.17.21	PTR	mb.airtel.in
125.19.17.22	PTR	marketingimages.airtel.in
125.19.17.37	PTR	www.airtelbank.com
125.19.17.37	A	ecom.airtelbank.com
125.19.17.38	A	portal.airtelbank.com
125.19.17.39	A	retailerapp.airtelbank.com
125.19.17.46	A	smartapi.airtel.in
125.19.17.48	A	tms.airtelbroadband.in
125.19.17.51	A	www.airteltez.com
125.19.17.69	A	emdub2b.airtel.in
125.19.17.97	A	scooby.airtel.in
125.19.18.34	PTR	1nbox.net
125.19.19.50	PTR	dlfgroup.in
125.19.19.74	A	smtp.concorindia.com
125.19.19.82	PTR	server.incometax.gov.in
125.19.19.82	A	webmail.incometax.gov.in
125.19.19.83	PTR	mail.incometaxindiaefiling.gov.in
125.19.19.84	A+PTR	mail.incometaxindia.gov.in
125.19.19.84	A	pdcsmtp02.incometax.gov.in
125.19.19.86	A	pextdnsv01.incometax.gov.in
125.19.19.87	A	pextdnsv02.incometax.gov.in
125.19.19.88	PTR	mail.incometaxindiaefiling.gov.in