Robtex

Up: 198.135.0.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 198.135.0.0/22
Down right: 198.135.4.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
198.135.0.1	A	bxb22-isp-gw1-gig0-1-0.cisco.com
198.135.0.2	A+PTR	bxb22-dmzbb-gw1-gig5-1.cisco.com
198.135.0.18	A	bxb23-dmzbb-gw1-gig5-1.cisco.com
198.135.0.66	PTR	bxb22-dmzlab-gw1-gig1-0-1.cisco.com
198.135.0.66	A	bxb22-dmzlab-gw1-ten1-1-1.cisco.com
198.135.0.118	A	bxb25-dmzlab-gw1-gig1-0-28.cisco.com
198.135.0.125	A	bxb23-dmznet-gw1-gig2-41.cisco.com
198.135.0.130	A	bxb22-access-gw1-gig5-1.cisco.com
198.135.0.148	A	bxb22-oeap-wlc1.cisco.com
198.135.0.162	A+PTR	bxb22-access-gw1-vla110.cisco.com
198.135.0.164	PTR	bxb-vpn-cluster.cisco.com
198.135.0.166	A	bxb23-vpn-cluster-1.cisco.com
198.135.0.177	A	bxb23-access-hub1-loo1.cisco.com
198.135.0.233	A+PTR	198-135-0-233.cisco.com
198.135.0.233	A	mypetforpresident.com
198.135.0.233	A	williamsvt.com
198.135.1.47	A+PTR	asa12.cisco.com
198.135.1.62	A	synocorp.net
198.135.1.66	A	asatools.cisco.com
198.135.2.1	A	bxb25-dmzlab-gw1-gig1-0-4.cisco.com
198.135.2.21	A	bxb22-dmzlab-gw1-fas1-0-2.cisco.com
198.135.2.26	A	00039fd-cimc.cisco.com
198.135.2.99	A	ucdemolab.com
198.135.2.100	A	ucdemolab-ns.cisco.com
198.135.2.101	PTR	ns2-ucdemolab.cisco.com
198.135.2.101	A	smtp.ucdemolab.com
198.135.2.101	A	mail.ucdemolab.com
198.135.2.104	A	thsguest.com
198.135.2.106	A	ucdemolab.com
198.135.2.107	A	ucdemolab.com
198.135.2.108	A	bots.incis.co
198.135.2.110	A	mail.ucdemolab.com
198.135.3.100	PTR	ccbu-sftp-ext.cisco.com
198.135.3.120	A	ccpdemo20.cisco.com
198.135.3.120	A	ccpdemo99.cisco.com
198.135.3.126	A	ccpdemo1.cisco.com