Robtex

Up: 1.23.240.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 1.23.240.0/22
Down right: 1.23.244.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
1.23.240.14	PTR	mail.aquamaritime.com
1.23.240.18	PTR	timail.tokheimindia.com
1.23.240.83	A	mx1.vertexgroup.co.in
1.23.240.83	A	mail.shelltransource.com
1.23.240.83	A	mx1.shelltransource.com
1.23.240.154	A+PTR	thinqpharma.in
1.23.240.163	A+PTR	timail.tokheimindia.com
1.23.240.170	PTR	mail.pvn.in
1.23.240.170	A	mail.kandui.in
1.23.240.205	A	www.riyabusinesstravel.com
1.23.240.205	A	riyabusinesstravel.com
1.23.240.205	A	ourplb.com
1.23.242.134	A	nichint.com
1.23.242.234	PTR	profitron.com
1.23.242.234	A	curvesfurniture.com
1.23.242.234	A	surjo.co
1.23.242.235	PTR	somatagenesis.xeeor.com
1.23.242.236	PTR	ns12.xeeor.com
1.23.242.237	PTR	cloud3.xeeor.com
1.23.243.2	A+PTR	mail.emobimailpro.com
1.23.243.3	PTR	m1.emobimailpro.com
1.23.243.4	PTR	m1.emobimailpro.com
1.23.243.5	PTR	m1.emobimailpro.com
1.23.243.8	PTR	m1.emobimailpro.com
1.23.243.9	PTR	m1.emobimailpro.com
1.23.243.10	PTR	m2.emobimailpro.com
1.23.243.11	PTR	m2.emobimailpro.com
1.23.243.16	PTR	mta1.emobimail.com
1.23.243.17	PTR	mta2.emobimail.com
1.23.243.18	PTR	mta3.emobimail.com
1.23.243.19	PTR	mta4.emobimail.com
1.23.243.24	PTR	mta9.emobimail.com
1.23.243.25	PTR	mta10.emobimail.com
1.23.243.26	PTR	mta11.emobimail.com
1.23.243.27	PTR	mta12.emobimail.com
1.23.243.115	A+PTR	email.phalanxlabs.in
1.23.243.117	A+PTR	mail.thermalindia.com
1.23.243.148	A	plasticsfocusasia.com
1.23.243.178	A+PTR	mail01.meenakshienergy.com
1.23.243.179	A	mail.meenakshienergy.com
1.23.243.181	A+PTR	mail02.meenakshienergy.com
1.23.243.227	PTR	mail.biologicale.co.in
1.23.243.233	PTR	mail3.biologicale.co.in
1.23.243.242	A	mail.itlinkinternational.com
1.23.243.244	PTR	mail.itlinkinternational.com
1.23.243.244	A	itlinkinternational.com