Robtex

Up: 208.81.120.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 208.81.120.0/23
Down right: 208.81.122.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
208.81.120.1	A+PTR	carmd-fwm01.sierrawireless.com
208.81.120.17	A+PTR	carmd.da.sierrawireless.com
208.81.120.77	A	sslvpn.sierrawireless.com
208.81.120.80	A+PTR	carmd-vpn.da.sierrawireless.com
208.81.120.99	A+PTR	carmd-pptp.sierrawireless.com
208.81.120.99	A+PTR	vpn.sierrawireless.com
208.81.121.6	A+PTR	mail.sierrawireless.com
208.81.121.6	A+PTR	oldmail.sierrawireless.com
208.81.121.7	A	mx.sierrawireless.com
208.81.121.7	A	mx1.sierrawireless.com
208.81.121.9	PTR	sierrawireless.ca
208.81.121.9	A+PTR	wirelessready.ca
208.81.121.9	PTR	sierra-wireless.com
208.81.121.12	A	g.menahga.k12.mn.us
208.81.121.15	A+PTR	mmm01.sierrawireless.com
208.81.121.23	A+PTR	ftp.sierrawireless.com
208.81.121.23	A+PTR	ftp1.sierrawireless.com
208.81.121.23	A+PTR	ftp4.sierrawireless.com
208.81.121.30	A+PTR	web.sierrawireless.com
208.81.121.30	A	maingate.se
208.81.121.44	A	carmdsmtp.sierrawireless.com
208.81.121.44	A	spf.sierrawireless.com
208.81.121.45	A+PTR	carmd-sa01.sierrawireless.com
208.81.121.45	A+PTR	spf.sierrawireless.com
208.81.121.47	A	spf.sierrawireless.com
208.81.121.48	A	mmm-techsupport.sierrawireless.com
208.81.121.60	PTR	airlink.com
208.81.121.60	A+PTR	attsales.sierrawireless.com
208.81.121.60	A+PTR	telustbs.sierrawireless.com
208.81.121.66	A+PTR	ns01.sierrawireless.com
208.81.121.102	A+PTR	swiextranet.sierrawireless.com
208.81.121.124	A+PTR	agile.sierrawireless.com
208.81.122.31	A+PTR	swbrainpark.com
208.81.122.31	PTR	mail.swbrainpark.com
208.81.123.151	A	h130112j0971.ping.omgservice.com
208.81.123.151	A	h130112j0971.diagnostics.omgservice.com
208.81.123.151	A	h070110g0783.ping.omgservice.com
208.81.123.153	A	demo-amm.inmotionsolutions.net