Robtex

Up: 173.198.128.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 173.198.160.0/20
Down right: 173.198.176.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
173.198.160.0	PTR	client-173.198.160.0.idf.id.digis.net
173.198.160.6	PTR	client-173.198.160.6.idf.id.digis.net
173.198.163.95	A	rydalch.net
173.198.163.95	A	mail.rydalch.net
173.198.164.7	PTR	client-173.198.164.7.idf.id.digis.net
173.198.165.18	A	mail.southsinc.net
173.198.165.18	A	smtp.southsinc.net
173.198.165.54	A	mail.preferredservicemech.com
173.198.165.92	PTR	client-173.198.165.92.idf.id.digis.net
173.198.165.92	A	remote.playgroundprofessionals.com
173.198.165.92	A	pictureperfectplaygrounds.com
173.198.165.218	PTR	client-173.198.165.218.idf.id.digis.net
173.198.166.10	A	proxy.johnrshannon.com
173.198.166.11	A	mail.johnrshannon.com
173.198.166.12	A	www.johnrshannon.com
173.198.166.27	PTR	mail.gotspuds.com
173.198.166.27	A	mail.nonparl.com
173.198.166.162	A	mail.hes1.com
173.198.166.210	PTR	client-173.198.166.210.idf.id.digis.net
173.198.166.210	A	zerofuck.com
173.198.166.210	A	tapnfill.com
173.198.166.213	PTR	client-173.198.166.213.idf.id.digis.net
173.198.166.213	A	fallsbrewing.net
173.198.169.69	PTR	client-173.198.169.69.idf.id.digis.net
173.198.170.232	A	ns1.dcoakey.com
173.198.170.232	A	ns0.dcoakey.com
173.198.170.232	A	dcoakey.ddns.net
173.198.172.35	PTR	client-173.198.172.35.idf.id.digis.net
173.198.172.86	A	mail.hostc.co
173.198.172.226	A	ngssupply.com
173.198.172.226	A	shawautoparts.com
173.198.172.226	A	gregsigerson.com
173.198.174.125	PTR	client-173.198.174.125.idf.id.digis.net
173.198.179.32	PTR	client-173.198.179.32.idf.id.digis.net
173.198.179.34	PTR	client-173.198.179.34.idf.id.digis.net
173.198.179.87	PTR	client-173.198.179.87.idf.id.digis.net
173.198.179.168	PTR	client-173.198.179.168.idf.id.digis.net
173.198.179.170	PTR	client-173.198.179.170.idf.id.digis.net
173.198.181.146	PTR	client-173.198.181.146.idf.id.digis.net
173.198.181.146	A	ninjaguy.net
173.198.183.170	PTR	client-173.198.183.170.idf.id.digis.net
173.198.188.46	PTR	client-173.198.188.46.idf.id.digis.net
173.198.188.46	A	rensai.damnserver.com
173.198.188.239	PTR	client-173.198.188.239.idf.id.digis.net
173.198.190.234	PTR	client-173.198.190.234.idf.id.digis.net
173.198.191.2	PTR	client-173.198.191.2.idf.id.digis.net
173.198.191.255	PTR	client-173.198.191.255.idf.id.digis.net