Robtex

Up: 203.123.32.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 203.123.32.0/22
Down right: 203.123.36.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.123.32.0	PTR	pool-203.123.32.rev.spectranet.in
203.123.32.20	PTR	203.123.32.20.reverse.spectranet.in
203.123.32.126	A	flightcatchers.co.in
203.123.32.179	A+PTR	mx1.tenonservices.com
203.123.32.179	A	mx1.soteria.in
203.123.32.179	A	mx1.morticegroup.com
203.123.32.210	PTR	203.123.32.210.reverse.spectranet.in
203.123.32.242	PTR	203.123.32.242.reverse.spectranet.in
203.123.32.243	PTR	203.123.32.243.reverse.spectranet.in
203.123.33.3	PTR	email.prime-phil.com
203.123.33.3	A	webmail2.prime-pci.com
203.123.33.3	A	mail1.onettechnologiesindia.com
203.123.33.4	PTR	203.123.33.4.reverse.spectranet.in
203.123.33.18	PTR	webmail.prime-pci.com
203.123.33.74	A+PTR	mail.pioneerurban.in
203.123.33.84	PTR	myhr.religaretech.com
203.123.33.87	PTR	203.123.33.87.reverse.spectranet.in
203.123.33.87	A	www.healthfore.com
203.123.33.116	PTR	pool-203.123.33.rev.spectranet.in
203.123.34.52	A	mailserver.shrenuj.in
203.123.34.52	A	backup.shrenuj.com
203.123.34.100	A	mail.systematixshares.com
203.123.34.100	A	mx1.systematixshares.com
203.123.34.102	A	backoffice.systematixshares.com
203.123.34.102	A	intranet.systematixshares.com
203.123.34.118	A	mail.systematixgroup.in
203.123.34.234	PTR	spec-123203234-a.spectranet.com
203.123.34.234	A	ihpco.in
203.123.34.234	A	cepf.in
203.123.35.2	PTR	203.123.35.2.reverse.spectranet.in
203.123.36.36	A	endoscopycare.com
203.123.36.84	A	mail.dxmart.com
203.123.36.84	A	dxmart.com
203.123.36.110	PTR	203.123.36.110.reverse.spectranet.in
203.123.37.0	PTR	203.123.37.0.reverse.spectranet.in
203.123.37.66	PTR	ns1.valcare.com
203.123.37.67	PTR	ns2.valcare.com
203.123.37.67	A	jrmehta.com
203.123.37.67	A	reaxain.com
203.123.37.68	PTR	ns3.valcare.com
203.123.37.69	PTR	mail.valcare.com
203.123.37.69	A	mail.finorga.in