Robtex

Up: 208.80.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 208.80.16.0/23
Down right: 208.80.18.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
208.80.16.2	A+PTR	cdr-ex.corduro.com
208.80.16.7	A	mail2.corduro.com
208.80.16.8	A+PTR	cdr-ex.corduro.com
208.80.16.8	A+PTR	wemail.corduro.com
208.80.16.10	PTR	dnspl.corduro.com
208.80.16.10	A	ns1.crydon.net
208.80.16.10	A	pfa-ns1.pfausa.com
208.80.16.16	A	tfs.corduro.com
208.80.16.17	A	ikira.com
208.80.16.17	A	*.ikira.com
208.80.16.20	A+PTR	cdr-share.corduro.com
208.80.16.30	A+PTR	ivr01.corduro.com
208.80.16.47	A	corduromerchantservices.com
208.80.16.100	A+PTR	sp.corduro.com
208.80.16.162	A	mylabdfw.com
208.80.16.200	A	mailpl.corduro.com
208.80.16.215	A	cordurotest.com
208.80.17.31	A	payment2.corduro.com
208.80.17.41	PTR	mobilizeyourarmy.com
208.80.17.41	PTR	cdrinfo.corduro.com
208.80.17.41	PTR	event.corduro.com
208.80.17.45	A+PTR	www.givemobile.com
208.80.17.45	PTR	givemobile.com
208.80.17.45	A+PTR	*.givemobile.com
208.80.17.55	A	contribute.corduro.com
208.80.17.83	A	markettest.corduro.com
208.80.17.131	A	paymyagent.com
208.80.17.131	A	paymyagent.net
208.80.17.132	A	paymyebay.net
208.80.17.132	A	paymyebay.com
208.80.17.133	A	paymyvendor.net
208.80.17.133	A	paymyvendor.com
208.80.17.154	PTR	mobilize.corduro.com
208.80.17.154	A+PTR	mya.corduro.com
208.80.17.154	A	mobilizeyourpassion.net
208.80.17.160	PTR	corduro.net
208.80.17.160	PTR	receipt.corduro.com
208.80.17.160	PTR	www.corduro.net
208.80.17.161	PTR	corduro.com
208.80.17.161	PTR	*.corduro.com
208.80.17.161	PTR	www.corduro.com
208.80.17.165	A	offlicense.com
208.80.17.166	A+PTR	pledgenow.corduro.com
208.80.17.166	A	corduroevents.com
208.80.18.14	A+PTR	gtmpl.corduro.com