Robtex

Up: 204.15.64.0/24
Can't show all results, try to descend to a more specific CIDR
Down left: 204.15.64.128/26
Down right: 204.15.64.192/26
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
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
204.15.64.183	A	b2bqa.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