Robtex

Up: 72.163.0.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 72.163.32.0/20
Down right: 72.163.48.0/20

IP	Type	Hostname
72.163.32.43	A	rcdn9-10n-dci02n-ntp1.cisco.com
72.163.33.54	A+PTR	unity-sj-rcdn.cisco.com
72.163.34.25	A	11i-tst-csm-101.cisco.com
72.163.34.27	A	11i-tst-csm-103.cisco.com
72.163.34.33	A+PTR	11i-tst-csm-109.cisco.com
72.163.34.35	A+PTR	rcdn9-dc-qualys-1.cisco.com
72.163.34.38	A	cm-ts5qtc.cisco.com
72.163.34.39	A	cm-ts5bvp.cisco.com
72.163.34.250	A	dhcp-72-163-34-250.cisco.com
72.163.35.2	A+PTR	rcdn9-a19-dci06n-gw1-vla108.cisco.com
72.163.38.2	PTR	rcdn9-a19-dci06n-gw1-vla314.cisco.com
72.163.38.2	A	rcdn9-11a-dci03s-gw1-vla314.cisco.com
72.163.39.29	A	wwwin-otmprd.cisco.com
72.163.41.206	A	wwwin-idmprd.cisco.com
72.163.42.228	A+PTR	oms-prd-03.cisco.com
72.163.42.254	A+PTR	wwwin-sars.cisco.com
72.163.42.255	A+PTR	wwwin-tsn3.cisco.com
72.163.43.97	A+PTR	cdetsweb-prd.cisco.com
72.163.43.97	A	cdets.cisco.com
72.163.43.123	A	topic.cisco.com
72.163.43.123	A	google-prd.cisco.com
72.163.43.149	A+PTR	smartcare1web.cisco.com
72.163.43.155	A+PTR	icdweb-prd.cisco.com
72.163.43.217	A+PTR	mg-prd-app-vip.cisco.com
72.163.43.217	A	mailguard.cisco.com
72.163.43.225	A+PTR	tas-app.cisco.com
72.163.43.227	A+PTR	lcmweb.cisco.com
72.163.44.25	A+PTR	wwwin-tools1.cisco.com
72.163.44.25	A	wwwin-tools.cisco.com
72.163.44.26	A+PTR	wwwin-tools1-ss2.cisco.com
72.163.47.11	A	dns-rch2.cisco.com
72.163.50.81	A+PTR	bam.cisco.com
72.163.50.93	A+PTR	cvt-app-004-p.cisco.com
72.163.50.100	A+PTR	at-tools-prd-13.cisco.com
72.163.50.128	A+PTR	its-app-001-p.cisco.com
72.163.50.160	A	repo-art.cisco.com
72.163.50.245	A+PTR	infor-iprd-rcdn9-22.cisco.com
72.163.55.11	A	wwwin-csfprd.cisco.com
72.163.56.108	A	sharevideo.cisco.com
72.163.57.76	A	rcdn9-08o-dci01n-gss1.cisco.com
72.163.57.76	A	rcdn9-08o-dci06n-gss1.cisco.com
72.163.59.19	A+PTR	videosharing.cisco.com
72.163.59.41	A	cfgsrv-poe.cisco.com
72.163.59.71	A	wwwin-sbxapp-prd.cisco.com