Robtex

Up: 72.21.32.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 72.21.36.0/23
Down right: 72.21.38.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.21.36.122	A	thomasdelivers.com
72.21.36.122	A	s1.plasticgames.com
72.21.36.234	PTR	234.36.21.72.static.reverse.ltdomains.com
72.21.37.2	A	lnxbrz3104.cust.fluidata.com
72.21.37.65	PTR	65.37.21.72.static.reverse.ltdomains.com
72.21.37.66	PTR	66.37.21.72.static.reverse.ltdomains.com
72.21.37.68	PTR	68.37.21.72.static.reverse.ltdomains.com
72.21.37.69	PTR	69.37.21.72.static.reverse.ltdomains.com
72.21.37.70	PTR	70.37.21.72.static.reverse.ltdomains.com
72.21.37.98	A	web.cpammali.net
72.21.37.98	A	ns1.woolywoods.us
72.21.37.98	A	www.cpammali.net
72.21.37.101	A	icims-talentplatform-37101.email.icims.tools
72.21.37.115	A+PTR	icims-talentplatform-37115.email.icims.tools
72.21.37.117	PTR	72-21-37-117.vircnet.com.au
72.21.37.136	A	sf-capeunionmart.mobi
72.21.37.138	PTR	138.37.21.72.static.reverse.ltdomains.com
72.21.37.138	A	celebritybattles.com
72.21.37.138	A	celebritypapers.com
72.21.37.161	A	sfkiko.mobi
72.21.37.237	PTR	237.37.21.72.static.reverse.ltdomains.com
72.21.38.130	A	plug.wire.org.za
72.21.38.138	PTR	138.38.21.72.static.reverse.ltdomains.com
72.21.38.157	A	mail.karapuz.com.ua
72.21.38.157	A	*.karapuz.com.ua
72.21.38.157	A	karapuz.com.ua
72.21.39.122	A	mail.gdreducation.com
72.21.39.123	PTR	123.39.21.72.static.reverse.ltdomains.com
72.21.39.123	A	frsmtpa.verinthms.com
72.21.39.179	PTR	179.39.21.72.static.reverse.ltdomains.com
72.21.39.187	A	ns2.warmhat.com
72.21.39.194	A	ns1.host-tech.net
72.21.39.196	PTR	v3n0m3.0z0n3.com
72.21.39.219	A	ns2.luminousstudio.com
72.21.39.230	PTR	230.39.21.72.static.reverse.ltdomains.com