Robtex

Up: 170.20.0.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 170.20.0.0/25
Down right: 170.20.0.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
170.20.0.4	PTR	si2001.bc.cbsig.net
170.20.0.12	PTR	resolver-vip1.bc.cbsig.net
170.20.0.14	PTR	shoapps-vip1.cbsig.net
170.20.0.14	A	dextersfollowthecode.com
170.20.0.14	A	www.dextersfollowthecode.com
170.20.0.16	A+PTR	ns1.cbsig.net
170.20.0.16	A	ns3.cbsig.net
170.20.0.16	A	ns.uninc.com
170.20.0.17	A+PTR	ns2.cbsig.net
170.20.0.17	A	ns2.spln.org
170.20.0.18	PTR	cbsnews-vip1.cbsig.net
170.20.0.18	PTR	cbsnews-vip1.bc.cbsig.net
170.20.0.18	A	eyeonthewhitehouse.com
170.20.0.19	PTR	cbsnews-vip2.cbsig.net
170.20.0.19	PTR	cbsnews-vip2.bc.cbsig.net
170.20.0.19	A	eyeonthewhitehouse.com
170.20.0.20	A	smtprelay.cbs.com
170.20.0.20	A	mail.collegesports.com
170.20.0.21	PTR	newspathflash.cbs.com
170.20.0.22	A+PTR	mail.cbsig.net
170.20.0.22	A	mail02.cbsig.net
170.20.0.22	A	lists.cbsig.net
170.20.0.24	PTR	cbs.com
170.20.0.24	A	cbsbracket.com
170.20.0.24	A	eye-web.com
170.20.0.25	PTR	cbs.com
170.20.0.25	A	cbsbracket.com
170.20.0.25	A	eye-web.com
170.20.0.26	PTR	sharedsites-vip1.cbsig.net
170.20.0.26	A	www.arrowfm.com
170.20.0.26	A	showtimeboxing.com
170.20.0.27	PTR	sharedsites22-vip1.cbsig.net
170.20.0.27	A	sharedsites22.cbsig.net
170.20.0.27	A	cbsstores.com
170.20.0.28	PTR	cgi.cbs.com
170.20.0.29	PTR	video.cgi.cbs.com
170.20.0.29	A	live.video.cgi.cbs.com
170.20.0.29	A	videocgi.bc.cbsig.net
170.20.0.30	A	search.cbs.com
170.20.0.31	PTR	cbspressexpress.com
170.20.0.32	A+PTR	ny-mpx.cbsig.net
170.20.0.34	A+PTR	phpdb.cbsig.net
170.20.0.34	A	autoscoop.us
170.20.0.34	A	autoscoop.org
170.20.0.36	PTR	sho.com
170.20.0.36	A	flix.info
170.20.0.37	PTR	video.cgi.cbs.com
170.20.0.37	A	live.video.cgi.cbs.com
170.20.0.37	A	videocgi.bc.cbsig.net
170.20.0.38	A	nyphotos.cbsig.net
170.20.0.38	A	www.cwtvpr.com
170.20.0.38	A	cbsconnections.com
170.20.0.40	PTR	helix-vip1.cbsig.net
170.20.0.40	A	real.bc.cbsig.net
170.20.0.40	A	real.cbsig.net
170.20.0.41	PTR	helix-vip2.cbsig.net
170.20.0.41	A	real.bc.cbsig.net
170.20.0.41	A	real.cbsig.net
170.20.0.42	PTR	winmed-vip1.cbsig.net
170.20.0.42	A	winmed.cbsig.net.cbslf.com.akadns.net
170.20.0.42	A	winmed.cbsig.net
170.20.0.43	PTR	winmed-vip2.cbsig.net
170.20.0.43	A	winmed.cbsig.net.cbslf.com.akadns.net
170.20.0.43	A	winmed.cbsig.net
170.20.0.44	PTR	progvid-vip1.cbsig.net
170.20.0.44	A	progressive.cbsig.net
170.20.0.45	A+PTR	winmedcdn.cbsig.net
170.20.0.45	A	winmedcdn.bc.cbsig.net
170.20.0.46	PTR	flash-vip1.cbsig.net
170.20.0.46	A	flash.cbsig.net.cbslf.com.akadns.net
170.20.0.46	A	flash.cbsig.net
170.20.0.47	PTR	flash-vip2.cbsig.net
170.20.0.47	A	flash.cbsig.net.cbslf.com.akadns.net
170.20.0.47	A	flash.cbsig.net
170.20.0.48	PTR	ftp.cbs.com
170.20.0.48	A	ftp.cbsig.net
170.20.0.50	A	aspera-vip1.bc.cbsig.net
170.20.0.54	PTR	dns2.nyc1.cbsig.net
170.20.0.64	PTR	winmed64.bc.cbsig.net
170.20.0.65	PTR	winmed65.bc.cbsig.net
170.20.0.68	PTR	winmed68.bc.cbsig.net
170.20.0.76	PTR	winweb76.bc.cbsig.net
170.20.0.76	A	www.cbsbroadcastcontrol.com
170.20.0.76	A	infinity.landing.cbsig.net
170.20.0.77	A	radioalice.net
170.20.0.77	A	www.z93.net
170.20.0.77	A	z93.net
170.20.0.78	PTR	hrcareers.bc.cbsig.net
170.20.0.107	A+PTR	util2004-fe.bc.cbsig.net
170.20.0.120	A+PTR	mail-ny.cbs.com
170.20.0.120	A	infweb120.bc.cbsig.net
170.20.0.121	A+PTR	mail.cbsops.com
170.20.0.121	A	ws2121-fe.bc.cbsig.net
170.20.0.135	PTR	c33-pi-vidbot18-fe.bc.cbsig.net
170.20.0.140	PTR	ws2140-fe.bc.cbsig.net
170.20.0.146	PTR	ns2004-fe.bc.cbsig.net
170.20.0.148	A	ftp2000-fe.bc.cbsig.net
170.20.0.149	PTR	searchidx-fe.bc.cbsig.net
170.20.0.161	A+PTR	ws2161-fe.bc.cbsig.net
170.20.0.162	A+PTR	ws2162-fe.bc.cbsig.net
170.20.0.170	A+PTR	ws2170-fe.bc.cbsig.net
170.20.0.172	PTR	ws2172-fe.bc.cbsig.net
170.20.0.186	A+PTR	web186.bc.cbsig.net
170.20.0.190	A+PTR	c33-pi-vidbot5-fe.bc.cbsig.net
170.20.0.194	A	c33-pi-vidbot9-fe.bc.cbsig.net
170.20.0.198	A+PTR	ns2002-fe.bc.cbsig.net
170.20.0.202	A+PTR	c33-pi-vidbot3-fe.bc.cbsig.net
170.20.0.204	A+PTR	ws2204-fe.bc.cbsig.net
170.20.0.209	A+PTR	ws2209-fe.bc.cbsig.net
170.20.0.216	A+PTR	ws2216-fe.bc.cbsig.net
170.20.0.221	A+PTR	ws2221-fe.bc.cbsig.net
170.20.0.232	A+PTR	c33-pi-vidbot4-fe.bc.cbsig.net
170.20.0.237	A	old.cbspressexpress.com
170.20.0.242	A+PTR	ws2242-fe.bc.cbsig.net
170.20.0.248	A+PTR	ws2042-fe.bc.cbsig.net
170.20.0.248	A	cbsnewsemployees.com
170.20.0.249	A+PTR	ws2043-fe.bc.cbsig.net
170.20.0.249	A	cbsnewsemployees.com
170.20.0.250	A+PTR	geo2001-fe.bc.cbsig.net
170.20.0.251	A+PTR	ws2045-fe.bc.cbsig.net
170.20.0.252	A+PTR	ws2046-fe.bc.cbsig.net
170.20.0.253	A+PTR	util2000-fe.bc.cbsig.net