Robtex

Up: 203.101.80.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 203.101.80.0/22
Down right: 203.101.84.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.101.80.3	PTR	mail.instaxs.com
203.101.80.11	PTR	mail.allengers.net
203.101.80.12	PTR	mail.sprayengineering.com
203.101.80.13	PTR	mail.instaxs.net
203.101.80.43	PTR	ip43.instaxs.net
203.101.80.74	PTR	tksoft.instaxs.net
203.101.81.190	A	unifiedcollab.com
203.101.82.17	A	mail1.macawberbeekay.com
203.101.82.130	PTR	arrowinfra.com
203.101.82.130	PTR	herocorp.com
203.101.82.130	PTR	herogroup.com
203.101.84.48	PTR	abts-north-static-048.84.101.203.airtelbroadband.in
203.101.84.64	PTR	abts-north-static-064.84.101.203.airtelbroadband.in
203.101.84.112	PTR	abts-north-static-112.84.101.203.airtelbroadband.in
203.101.84.120	PTR	abts-north-static-120.84.101.203.airtelbroadband.in