Robtex

Up: 72.20.36.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 72.20.38.0/24
Down right: 72.20.39.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.20.38.4	PTR
72.20.38.9	PTR
72.20.38.11	PTR
72.20.38.24	PTR	gm-gen.ru
72.20.38.25	PTR
72.20.38.27	PTR	sibirdosug.com
72.20.38.29	PTR
72.20.38.29	A	empfinance.org
72.20.38.34	PTR
72.20.38.50	PTR	p4r4d0x.net
72.20.38.55	PTR	murderface.org
72.20.38.61	A	dss.d1sh.org
72.20.38.78	PTR
72.20.38.78	A	skinny.blondes.withbig.tits.need.toungeaction.com
72.20.38.79	PTR
72.20.38.79	A	p.zzap.me
72.20.38.99	PTR	72.20.38.99.staminus.net
72.20.38.99	A	foolweasel.master.vg
72.20.38.102	PTR
72.20.38.102	A	morphforest.com
72.20.38.119	PTR
72.20.38.130	PTR
72.20.38.130	A	omfgwtfbbq.org
72.20.38.132	PTR	saved.his.porno.to.dvdrdrive.com
72.20.38.134	PTR
72.20.38.134	A	pgpmail.biz
72.20.38.134	A	mail1.digitalguard.biz
72.20.38.135	PTR	72.20.38.135.staminus.net
72.20.38.137	A+PTR	freedns2.registrar-servers.com
72.20.38.137	A	ns1.pokwa.net
72.20.38.137	A	ns2.hizzacked.com
72.20.38.138	PTR	dns5-5.registrar-servers.com
72.20.38.140	PTR	dns5-5.registrar-servers.com
72.20.38.146	PTR
72.20.38.147	PTR
72.20.38.147	A	behind.proxysocket.com
72.20.38.148	PTR
72.20.38.148	A	protected.proxysocket.com
72.20.38.161	PTR
72.20.38.162	PTR
72.20.38.170	PTR
72.20.38.194	PTR	punya.pacar.yang.sangat.perhatian.co.cc
72.20.38.202	PTR	power.puff.g1rl.in
72.20.38.218	PTR	own.a.lot.of.girl.from.vietnam.ro
72.20.38.229	PTR	cewek.cut3.in
72.20.38.239	PTR	nd.psybnc.org
72.20.38.246	PTR	lord.org.in
72.20.39.1	PTR
72.20.39.3	PTR
72.20.39.42	PTR
72.20.39.103	PTR
72.20.39.103	A	redcircle.za.org
72.20.39.115	PTR
72.20.39.123	PTR
72.20.39.126	A	admin.ispeeds.net
72.20.39.133	PTR
72.20.39.138	PTR
72.20.39.142	PTR
72.20.39.176	PTR	72.20.39.176.staminus.net
72.20.39.182	A+PTR	ns1.winhost.com
72.20.39.182	A	ns1.pure4s.com
72.20.39.189	PTR
72.20.39.190	PTR
72.20.39.193	A	chantix.co.uk
72.20.39.201	PTR	72.20.39.201.intreppid.com
72.20.39.204	A	ns1.daipo.com
72.20.39.205	A	ns2.daipo.com
72.20.39.249	PTR