Robtex

Up: 125.21.16.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 125.21.17.0/25
Down right: 125.21.17.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
125.21.17.39	PTR	aes-static-39.17.21.125.airtel.in\032
125.21.17.43	A+PTR	smtp2.royalenfield.com
125.21.17.43	A+PTR	smtp2.eicher.in
125.21.17.43	A+PTR	smtp2.vecv.in
125.21.17.170	A	nsbbpo.com
125.21.17.174	PTR	mx1.nsbbpo.in
125.21.17.174	A	webmail.nsbbpo.in
125.21.17.196	A	python.impetus.co.in
125.21.17.198	PTR	intellismtp1.intellicus.com
125.21.17.200	PTR	python.impetus.co.in
125.21.17.211	A	smtp.clear-trail.com
125.21.17.213	PTR	gateway.clear-trail.com