Robtex

Up: 173.1.128.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 173.1.128.0/21
Down right: 173.1.136.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
173.1.128.0	PTR	173.1.128.0.reverse.gogrid.com
173.1.128.2	PTR	173.1.128.2.reverse.gogrid.com
173.1.128.18	PTR	shop1.wisemo.com
173.1.128.18	A	wisemo.dk
173.1.128.18	A	wisemo.eu
173.1.128.28	A	wisemo.dk
173.1.128.28	A	wisemo.eu
173.1.128.28	A	wisemo.net
173.1.128.35	PTR	173.1.128.35.reverse.gogrid.com
173.1.128.35	A	icapauctions.com
173.1.128.35	A	rinsauctions.com
173.1.128.36	A	tendersinfo-esourcing.com
173.1.128.99	A	adoozlemail.com
173.1.128.155	A	www.igrad.com
173.1.128.155	A	igrad.com
173.1.128.155	A	collegecfo.com
173.1.128.156	A	holdinghands.org
173.1.128.194	PTR	lift-er.pl
173.1.128.194	A	lift-er.eu
173.1.130.98	PTR	youbiq.com
173.1.130.99	PTR	youbiq.com
173.1.131.1	PTR	173.1.131.1.reverse.gogrid.com
173.1.131.69	A	*.emetric.net
173.1.131.69	A	www.emetric.net
173.1.131.69	A	emetric.com
173.1.131.81	PTR	173.1.131.81.reverse.gogrid.com
173.1.132.68	A	rabin.ca
173.1.133.34	PTR	173.1.133.34.reverse.gogrid.com
173.1.133.34	A	casho.com
173.1.133.34	A	www.casho.com
173.1.133.35	PTR	langlearner.com
173.1.133.35	A	emailblasty.com
173.1.133.163	PTR	mail.americanhospice.com
173.1.135.50	PTR	cityofpearsall.com
173.1.135.50	PTR	drop-tineoutfitters.com
173.1.135.50	PTR	droptineranch.com
173.1.136.3	PTR	173.1.136.3.reverse.gogrid.com
173.1.136.130	PTR	173.1.136.130.reverse.gogrid.com
173.1.136.130	A	nordeca.net
173.1.136.130	A	nordeca.no
173.1.137.0	PTR	173.1.137.0.reverse.gogrid.com
173.1.137.1	PTR	173.1.137.1.reverse.gogrid.com
173.1.137.3	PTR	173.1.137.3.reverse.gogrid.com
173.1.137.80	PTR	173.1.137.80.reverse.gogrid.com
173.1.137.82	PTR	173.1.137.82.reverse.gogrid.com
173.1.137.82	A	www.netopia.ph
173.1.137.82	A	netopia.ph
173.1.137.83	PTR	173.1.137.83.reverse.gogrid.com
173.1.137.89	A	www.netopia.ph
173.1.137.89	A	netopia.ph
173.1.138.3	PTR	persony02.hostingservices.jkl5group.com
173.1.138.19	PTR	173.1.138.19.reverse.gogrid.com
173.1.138.19	A	hungrynetwork.com
173.1.138.19	A	madplotter.com
173.1.139.2	PTR	173.1.139.2.reverse.gogrid.com
173.1.139.100	A	staggeredtimesolutions.com
173.1.139.106	A	sleepingwell-ac.com
173.1.140.2	PTR	173.1.140.2.reverse.gogrid.com
173.1.141.1	PTR	173.1.141.1.reverse.gogrid.com
173.1.141.11	A	hyperhotspot.com
173.1.142.185	A	*.ioucentral.ca
173.1.143.2	PTR	173.1.143.2.reverse.gogrid.com
173.1.143.35	A	radialpace.com