Robtex

Up: 204.15.64.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 204.15.64.0/24
Down right: 204.15.65.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
204.15.64.0	PTR	network-204-15-64-0.websense.com
204.15.64.65	A	wirelessdemo.websense.com
204.15.64.76	A	meeting1b.websense.com
204.15.64.84	PTR	static-204-15-64-84.websense.com
204.15.64.86	PTR	static-204-15-64-86.websense.com
204.15.64.86	A	smtp.websensesupport.com
204.15.64.94	PTR	static-204-15-64-94.websense.com
204.15.64.111	PTR	static-204-15-64-111.websense.com
204.15.64.111	A	websense.net
204.15.64.117	PTR	static-204-15-64-117.websense.com
204.15.64.132	A	ws-ip135.websense.com
204.15.64.133	PTR	static-204-15-64-133.websense.com
204.15.64.133	A	im.websense.com
204.15.64.140	A+PTR	webmail.websense.com
204.15.64.155	PTR	static-204-15-64-155.websense.com
204.15.64.155	A	ws-ip189.websense.com
204.15.64.156	A	ws-ip190.websense.com
204.15.64.164	PTR	static-204-15-64-164.websense.com
204.15.64.164	A	ftpwsslx.websense.com
204.15.64.166	A+PTR	client.websense.com
204.15.64.167	A+PTR	ws121.websense.com
204.15.64.167	A	ws116.websense.com
204.15.64.167	A	pptp.websense.com
204.15.64.169	PTR	static-204-15-64-169.websense.com
204.15.64.169	A	mtas2.surfcontrol.com
204.15.64.169	A	mtas.surfcontrol.com
204.15.64.171	PTR	static-204-15-64-171.websense.com
204.15.64.177	A	mailcorp-sd1.websense.com
204.15.64.179	A	mailcorp-sd2.websense.com
204.15.64.180	A	mailcorp-sd3.websense.com
204.15.64.182	A+PTR	ftp.websense.com
204.15.64.182	A+PTR	ftp2.europe.websense.com
204.15.64.182	PTR	ftp2.websense.com
204.15.64.184	A	mailcorp-sd1.websense.com
204.15.64.185	A	mailcorp-sd1.websense.com
204.15.64.186	PTR	static-204-15-64-186.websense.com
204.15.64.186	A	mail3.netpart.com
204.15.64.187	PTR	static-204-15-64-187.websense.com
204.15.64.196	A+PTR	vpn.websense.com
204.15.64.196	A+PTR	vpn1.websense.com
204.15.64.196	A+PTR	americas.vpn.websense.com
204.15.64.200	A+PTR	ws101.websense.com
204.15.64.201	A	ws101-a.websense.com
204.15.64.202	A	ws101-b.websense.com
204.15.65.3	PTR	static-204-15-65-3.websense.com
204.15.65.33	PTR	static-204-15-65-33.websense.com
204.15.65.38	PTR	static-204-15-65-38.websense.com
204.15.65.43	PTR	static-204-15-65-43.websense.com
204.15.65.73	PTR	static-204-15-65-73.websense.com
204.15.65.80	PTR	tw.download.websense.com
204.15.65.131	PTR	static-204-15-65-131.websense.com
204.15.65.131	A	access.websense.com
204.15.65.132	PTR	static-204-15-65-132.websense.com
204.15.65.132	A	access.websense.com
204.15.65.142	PTR	static-204-15-65-142.websense.com
204.15.65.143	PTR	static-204-15-65-143.websense.com
204.15.65.146	PTR	static-204-15-65-146.websense.com
204.15.65.154	PTR	static-204-15-65-154.websense.com
204.15.65.154	A	esgsd2.websense.com
204.15.65.156	PTR	static-204-15-65-156.websense.com
204.15.65.156	A	esgsd1.websense.com
204.15.65.157	A+PTR	esgsd6.websense.com
204.15.65.158	PTR	esgsd2.websense.com
204.15.65.160	A+PTR	esgsd.websense.com
204.15.65.164	PTR	static-204-15-65-164.websense.com
204.15.65.168	PTR	static-204-15-65-168.websense.com
204.15.65.168	A	longhornatx.com
204.15.65.176	PTR	static-204-15-65-176.websense.com
204.15.65.183	PTR	static-204-15-65-183.websense.com
204.15.65.198	PTR	hsrp-204-15-65-198.websense.com
204.15.65.199	A	wbsnamer2.com
204.15.65.204	PTR	static-204-15-65-204.websense.com
204.15.65.209	PTR	static-204-15-65-209.websense.com
204.15.65.219	PTR	static-204-15-65-219.websense.com
204.15.65.223	PTR	static-204-15-65-223.websense.com
204.15.65.223	A+PTR	sftp-us.websense.com
204.15.65.223	A+PTR	xfr-us.websense.com
204.15.65.226	PTR	static-204-15-65-226.websense.com
204.15.65.226	A	smtp1.tritondemo.com
204.15.65.226	A	tritonapx.com
204.15.65.232	PTR	static-204-15-65-232.websense.com
204.15.65.234	PTR	static-204-15-65-234.websense.com
204.15.65.235	PTR	static-204-15-65-235.websense.com
204.15.65.247	PTR	broadcast-204-15-65-247.websense.com