Robtex

Up: 192.0.46.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 192.0.47.0/25
Down right: 192.0.47.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
192.0.47.7	PTR	www.icann.org
192.0.47.8	PTR	www.iana.org
192.0.47.8	A	ianaftp.vip.icann.org
192.0.47.9	PTR	www.internic.net
192.0.47.12	PTR	redirects.iana.org
192.0.47.13	PTR	tools.iana.org
192.0.47.15	PTR	reports.internic.net
192.0.47.16	PTR	dnscert.com
192.0.47.17	PTR	www.dnso.org
192.0.47.19	PTR	dns.icann.org
192.0.47.20	PTR	members.icann.org
192.0.47.21	PTR	www.atlargestudy.org
192.0.47.22	PTR	securedata.icann.org
192.0.47.24	PTR	ta.icann.org
192.0.47.25	PTR	data.iana.org
192.0.47.26	PTR	forum.icann.org
192.0.47.27	PTR	community.icann.org
192.0.47.30	A+PTR	47-30.dc.icann.org
192.0.47.32	PTR	drupal.icann.org
192.0.47.32	A	www.gnso.icann.org
192.0.47.32	A	drupal.vip.icann.org
192.0.47.35	PTR	research.icann.org
192.0.47.37	PTR	media1.icann.org
192.0.47.39	PTR	rzm.iana.org
192.0.47.40	PTR	newgtlds.icann.org
192.0.47.42	A+PTR	limesurvey.icann.org
192.0.47.44	PTR	archive.icann.org
192.0.47.45	PTR	czdap.icann.org
192.0.47.47	A+PTR	ebero.icann.org
192.0.47.47	A	ebero.vip.icann.org
192.0.47.53	PTR	whois.icann.org
192.0.47.56	PTR	gac.icann.org
192.0.47.57	A+PTR	gtldcomment.icann.org
192.0.47.58	A	gtldresult.vip.icann.org
192.0.47.58	A	gtldresult.icann.org
192.0.47.59	PTR	whois.iana.org
192.0.47.59	A	ianawhois.vip.icann.org
192.0.47.62	PTR	maintenance.icann.org
192.0.47.62	A	drupal.vip.icann.org
192.0.47.62	A	wp.vip.icann.org
192.0.47.63	PTR	47-63.dc.icann.org
192.0.47.64	A	47-64.dc.icann.org
192.0.47.68	A+PTR	47-68.dc.icann.org
192.0.47.71	A+PTR	47-71.dc.icann.org
192.0.47.75	A+PTR	47-75.dc.icann.org
192.0.47.76	A+PTR	47-76.dc.icann.org
192.0.47.83	A+PTR	47-83.dc.icann.org
192.0.47.88	A+PTR	47-88.dc.icann.org
192.0.47.89	A+PTR	stream1.dc.icann.org
192.0.47.92	A	47-92.dc.icann.org
192.0.47.94	A	47-94.dc.icann.org
192.0.47.95	PTR	47-95.dc.icann.org
192.0.47.100	PTR	mm.icann.org
192.0.47.100	A	47-100.dc.icann.org
192.0.47.107	A+PTR	47-107.dc.icann.org
192.0.47.109	A	47-109.dc.icann.org
192.0.47.111	A+PTR	47-111.dc.icann.org
192.0.47.119	PTR	47-119.dc.icann.org
192.0.47.128	PTR	47-128.dc.icann.org
192.0.47.132	A+PTR	iad.xfr.dns.icann.org
192.0.47.132	A	xfr.cjr.dns.icann.org
192.0.47.132	A	47-132.dc.icann.org
192.0.47.133	PTR	47-133.dc.icann.org
192.0.47.141	A+PTR	iad.nexpose.dns.icann.org
192.0.47.147	A	iad01.elastic-search.dns.icann.org
192.0.47.150	A+PTR	iad.hedgehog.dns.icann.org
192.0.47.150	A	47-150.dc.icann.org
192.0.47.151	A+PTR	iad.hedgehogdb.dns.icann.org
192.0.47.151	A	47-151.dc.icann.org
192.0.47.153	A+PTR	iad02.distribution.dns.icann.org
192.0.47.153	A	47-153.dc.icann.org
192.0.47.155	PTR	iad.nsicann.dns.icann.org
192.0.47.156	A+PTR	iad.inaddrarpa.dns.icann.org
192.0.47.156	A	47-156.dc.icann.org
192.0.47.158	A	iad.as112.dns.icann.org
192.0.47.160	PTR	47-160.dc.icann.org
192.0.47.163	A+PTR	iad02.gsi-distribution.dns.icann.org
192.0.47.164	PTR	gsi4.dns.icann.org
192.0.47.165	PTR	47-165.dc.icann.org
192.0.47.166	PTR	47-166.dc.icann.org
192.0.47.169	PTR	47-169.dc.icann.org
192.0.47.171	A+PTR	iad.aservers.dns.icann.org
192.0.47.171	A	47-171.dc.icann.org
192.0.47.173	PTR	iad.cservers.dns.icann.org
192.0.47.173	A	47-173.dc.icann.org
192.0.47.174	A+PTR	47-174.dc.icann.org
192.0.47.181	PTR	47-181.dc.icann.org
192.0.47.182	A	47-182.dc.icann.org
192.0.47.185	A+PTR	47-185.dc.icann.org
192.0.47.189	A+PTR	iad.weather.dns.icann.org
192.0.47.189	A	47-189.dc.icann.org
192.0.47.190	A+PTR	47-190.dc.icann.org
192.0.47.191	PTR	47-191.dc.icann.org
192.0.47.192	A+PTR	47-192.dc.icann.org
192.0.47.195	A+PTR	47-195.dc.icann.org
192.0.47.196	PTR	access1.dc.icann.org
192.0.47.197	A+PTR	access2.dc.icann.org
192.0.47.198	A	access.dc.icann.org
192.0.47.198	A	access-dc.icann.org
192.0.47.200	A	tat.dc.icann.org
192.0.47.204	A+PTR	kbox1.dc.icann.org
192.0.47.205	PTR	mi-vsp.icann.org
192.0.47.206	A+PTR	mi-sentry.icann.org
192.0.47.206	A	47-206.dc.icann.org
192.0.47.206	A	mi-sentry1.dc.icann.org
192.0.47.210	A+PTR	47-210.dc.icann.org
192.0.47.211	PTR	47-211.dc.icann.org
192.0.47.213	A+PTR	47-213.dc.icann.org
192.0.47.216	A+PTR	47-216.dc.icann.org
192.0.47.219	A+PTR	47-219.dc.icann.org
192.0.47.221	PTR	47-221.dc.icann.org
192.0.47.223	A+PTR	47-223.dc.icann.org
192.0.47.224	PTR	47-224.dc.icann.org
192.0.47.225	A+PTR	47-225.dc.icann.org
192.0.47.230	A	47-230.dc.icann.org
192.0.47.232	A+PTR	47-232.dc.icann.org
192.0.47.234	A+PTR	47-234.dc.icann.org
192.0.47.236	PTR	47-236.dc.icann.org
192.0.47.242	PTR	47-242.dc.icann.org
192.0.47.243	A+PTR	47-243.dc.icann.org
192.0.47.246	PTR	ipsec1.dc.icann.org
192.0.47.252	A+PTR	gtm1.dc.icann.org
192.0.47.255	A+PTR	47-255.dc.icann.org