Robtex

Up: 66.115.128.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 66.115.128.0/25
Down right: 66.115.128.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.115.128.1	PTR	reserved.128.115.66.in-addr.arpa
66.115.128.9	PTR	10761-gw1-gi1-0-40.eor3.atl5.as22384.net
66.115.128.11	PTR	reserved.128.115.66.in-addr.arpa
66.115.128.22	A	huey.nationalnet.com
66.115.128.29	PTR	cr1-atl2.te8-3.nationalnet.com
66.115.128.30	A	br1-atl5.te9-3.nationalnet.com
66.115.128.37	PTR	tr1.atl1-1-1.national-net.com
66.115.128.38	A+PTR	backup.national-net.com
66.115.128.60	PTR	microcentrosome.greatserversoftware.com
66.115.128.70	A	or1.jon1-e0-vegas.national-net.com
66.115.128.70	A	vegas.national-net.com
66.115.128.74	A+PTR	br1-atl5.te9-1.nationalnet.com
66.115.128.75	PTR	reserved.128.115.66.in-addr.arpa
66.115.128.75	A	mail.squirrelfood.net
66.115.128.75	A	hostmaster.squirrelfood.net
66.115.128.82	A	gw-allstarfg.nationalnet.com
66.115.128.90	PTR	reserved.128.115.66.in-addr.arpa
66.115.128.97	A	gig1-2.core2.nationalnet.com
66.115.128.97	A	gig1-2.tr1.atl4.national-net.com
66.115.128.97	A	tr2-atl4.gi1-2.nationalnet.com
66.115.128.98	PTR	eth1-3.peer1.nationalnet.com
66.115.128.98	A	mercedesbbwviponly.com
66.115.128.98	A	sugarpearbbw.com
66.115.128.101	A	gig1-3.tr1.atl4.national-net.com
66.115.128.110	A	ec2.tr1.atl4.national-net.com
66.115.128.114	A+PTR	gig2-10.tr1.atl4.national-net.com
66.115.128.122	A+PTR	webquest-cas001-atl5.te1-28.nationalnet.com
66.115.128.130	A	hotwiferio.com
66.115.128.132	A	128.132.cust.as6181.nationalnet.com
66.115.128.143	PTR	reserved.128.115.66.in-addr.arpa
66.115.128.164	PTR	mxmb-c.mail.nationalnet.com
66.115.128.164	A	mxmb-c.nationalnet.com
66.115.128.164	A	nat615.nationalnet.com
66.115.128.165	A+PTR	mxos-a.mail.nationalnet.com
66.115.128.165	A	nat617.nationalnet.com
66.115.128.166	A+PTR	mxos-b.mail.nationalnet.com
66.115.128.166	A	nat1790.nationalnet.com
66.115.128.167	A+PTR	mxlb-a.mail.nationalnet.com
66.115.128.167	A	nat1791.nationalnet.com
66.115.128.168	PTR	mxlb-b.mail.nationalnet.com
66.115.128.168	A	nat1792.nationalnet.com
66.115.128.169	PTR	mxdb-a.mail.nationalnet.com
66.115.128.172	A+PTR	mxmb-b.mail.nationalnet.com
66.115.128.175	PTR	mxgw-01.mail.nationalnet.com
66.115.128.176	A+PTR	mxgw-02.mail.nationalnet.com
66.115.128.178	A+PTR	mxint-02.mail.nationalnet.com
66.115.128.179	A+PTR	mxint-01.mail.nationalnet.com
66.115.128.181	A	mxdb-m.mail.nationalnet.com
66.115.128.183	A+PTR	mxlog.mail.nationalnet.com
66.115.128.184	PTR	mxos.mail.nationalnet.com
66.115.128.185	A+PTR	mxgw2.mail.nationalnet.com
66.115.128.185	A	mxgw-b.mail.nationalnet.com
66.115.128.185	A	mail2.csnetworksinc.com
66.115.128.187	A	nat1947.nationalnet.com
66.115.128.189	PTR	mxgw1.mail.nationalnet.com
66.115.128.189	A	mail7.nationalnet.com
66.115.128.189	A	mail2.national-net.com
66.115.128.190	A	*.com.htmlmx3.mail.national-net.com
66.115.128.190	A	mail.csnetworksinc.com
66.115.128.190	A	htmlmx-rr.mail.national-net.com
66.115.128.226	A	fw-delk.nationalnet.com
66.115.128.228	PTR	cosmic-gw1.atl2-p2p.nationalnet.com
66.115.128.228	A	mail.pichunterlive.com
66.115.128.229	A	cosmic-gw1.atl2-p2p.nationalnet.com
66.115.128.233	A+PTR	aon-gw1.mdf001-atl5.fa0-1.nationalnet.com
66.115.128.234	A+PTR	mdf001-atl5.fa0-1.aon-gw1.nationalnet.com
66.115.128.241	PTR	camspot.com
66.115.128.241	A	*.pichunterlive.com
66.115.128.242	A	mytinydick.com