Robtex

Up: 72.163.4.0/24
Can't show all results, try to descend to a more specific CIDR
Down left: 72.163.4.128/26
Down right: 72.163.4.192/26
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.163.4.129	PTR	hsrp-72-163-4-129.cisco.com
72.163.4.130	PTR	rcdn9-14a-dcz05n-gw1-vla311.cisco.com
72.163.4.131	PTR	rcdn9-16a-dcz05n-gw2-vla311.cisco.com
72.163.4.132	A+PTR	wemxweb-publish-prod1-04.cisco.com
72.163.4.133	A+PTR	wemxweb-publish-prod1-01.cisco.com
72.163.4.134	PTR	wemxweb-publish-prod1-02.cisco.com
72.163.4.135	A+PTR	wemxweb-publish-prod1-03.cisco.com
72.163.4.137	PTR	cepxweb-prod1-01.cisco.com
72.163.4.138	A+PTR	cepxweb-prod1-02.cisco.com
72.163.4.140	A+PTR	cepxweb-prod1-01-r5.cisco.com
72.163.4.141	A+PTR	cepxweb-prod1-02-r5.cisco.com
72.163.4.149	PTR	cdcxweb-prod1-01-new.cisco.com
72.163.4.150	A+PTR	cdcxweb-prod1-01.cisco.com
72.163.4.151	A+PTR	cdcxweb-prod1-02.cisco.com
72.163.4.152	A+PTR	cdcxweb-prod1-03.cisco.com
72.163.4.153	A+PTR	cdcxweb-prod1-04.cisco.com
72.163.4.154	PTR	redirect.cisco.com
72.163.4.154	A	www.neohapsis.com
72.163.4.154	A	cisco.kn
72.163.4.159	A+PTR	www1-ss2.cisco.com
72.163.4.160	A+PTR	www-prod1.cisco.com
72.163.4.161	PTR	www1.cisco.com
72.163.4.161	A	www.ipv6.cisco.com
72.163.4.161	A	cisco-kinetic.com
72.163.4.162	A+PTR	www1a.cisco.com
72.163.4.163	PTR	www1-ss9.cisco.com
72.163.4.164	PTR	www1-ss-nat164.cisco.com
72.163.4.165	PTR	www1-ss-nat165.cisco.com
72.163.4.166	PTR	www1-ss-nat166.cisco.com
72.163.4.167	PTR	www1-ss-nat167.cisco.com
72.163.4.168	PTR	www1-ss-nat168.cisco.com
72.163.4.169	PTR	www1-ss-nat169.cisco.com
72.163.4.170	A+PTR	cdcxrp-prod1-01.cisco.com
72.163.4.171	A+PTR	cdcxrp-prod1-02.cisco.com
72.163.4.172	A+PTR	wwwtest-prod1.cisco.com
72.163.4.173	PTR	wwwtest-prod1-ss2.cisco.com
72.163.4.175	A+PTR	www1-ipv6proxy.cisco.com
72.163.4.176	PTR	www-test1.cisco.com
72.163.4.176	A	www-test.cisco.com
72.163.4.177	A+PTR	www1-ss3.cisco.com
72.163.4.181	PTR	redirect-v6nat.cisco.com
72.163.4.181	A	redirect-nat.cisco.com
72.163.4.183	A	www1-realm.cisco.com
72.163.4.183	A	supplychain.cisco.com
72.163.4.185	A+PTR	redirect-ns.cisco.com
72.163.4.185	A	cisco.com
72.163.4.185	A	cisconode.com
72.163.4.200	A+PTR	cdcxweb-prod1-01-r5.cisco.com
72.163.4.201	A+PTR	cdcxweb-prod1-02-r5.cisco.com
72.163.4.202	A+PTR	cdcxweb-prod1-03-r5.cisco.com
72.163.4.203	PTR	cdcxweb-prod1-04-r5.cisco.com
72.163.4.230	A+PTR	cdcxrp-prod1-01-r5.cisco.com
72.163.4.231	PTR	cdcxrp-prod1-02-r5.cisco.com
72.163.4.251	A+PTR	www-01.cisco.com
72.163.4.253	PTR	rcdn9-14d-dcz05n-ssw1-ace3-l2br-prd1-cdc.cisco.com
72.163.4.254	PTR	rcdn9-16d-dcz05n-ssw2-ace3-l2br-prd1-cdc.cisco.com