Robtex

Up: 72.55.0.0/17
Can't show all results, try to descend to a more specific CIDR
Down left: 72.55.0.0/19
Down right: 72.55.32.0/19

IP	Type	Hostname
72.55.0.0	A+PTR	72-55-0-0-static.hfc.comcastbusiness.net
72.55.0.7	A+PTR	72-55-0-7-static.hfc.comcastbusiness.net
72.55.1.3	PTR	www.calchannel.com
72.55.1.4	PTR	gto.calchannel.com
72.55.1.4	PTR	mail.calchannel.com
72.55.8.17	A+PTR	72-55-8-17-static.hfc.comcastbusiness.net
72.55.8.32	A	pe01.santamaria.ca.ccs.comcast.net
72.55.8.231	PTR	smbsd.net
72.55.8.231	PTR	mail.smbsd.net
72.55.9.3	PTR	ns2.lusd.org
72.55.24.178	A	mail.popkinrosaler.com
72.55.25.226	A	ns1.davie-fl.gov
72.55.25.235	A	dc-65027c3d-mail.davie-fl.gov
72.55.25.235	A	mail.davie-fl.gov
72.55.26.65	A+PTR	mail.ci.miramar.fl.us
72.55.26.66	PTR	ci.miramar.fl.us
72.55.26.69	A	72-55-26-69-ip-static.hfc.comcastbusiness.net
72.55.26.70	A	72-55-26-70-ip-static.hfc.comcastbusiness.net
72.55.26.74	A	72-55-26-74-ip-static.hfc.comcastbusiness.net
72.55.28.48	A	mia-nce-dc1.cshado.org
72.55.28.49	A	mia-nce-dc2.cshado.org
72.55.28.52	A	cshado.org
72.55.28.52	A	mia-nce-dom01.cshado.org
72.55.28.74	A	ns4.americasnet.org
72.55.32.4	PTR	72-55-32-4-ip-static.hfc.comcastbusiness.net
72.55.32.13	A	72-55-32-13-ip-static.hfc.comcastbusiness.net
72.55.32.26	A	72-55-32-26-ip-static.hfc.comcastbusiness.net
72.55.32.65	PTR	72-55-32-65-ip-static.hfc.comcastbusiness.net
72.55.32.66	PTR	72-55-32-66-ip-static.hfc.comcastbusiness.net
72.55.32.67	PTR	72-55-32-67-ip-static.hfc.comcastbusiness.net
72.55.32.128	A+PTR	72-55-32-128-ip-static.hfc.comcastbusiness.net
72.55.32.129	PTR	72-55-32-129-ip-static.hfc.comcastbusiness.net
72.55.33.25	PTR	barracudacorp.omegasystemscorp.com
72.55.34.1	PTR	mail.clintoncountypa.com
72.55.34.5	PTR	webmail.omef.com
72.55.34.72	PTR	barracuda2.omegasystemscorp.com
72.55.35.8	A	72-55-35-8-ip-static.hfc.comcastbusiness.net
72.55.35.146	A	72-55-35-146-ip-static.hfc.comcastbusiness.net
72.55.41.50	A	gateway.mercerins.com
72.55.49.17	PTR	mail.yorklibraries.org
72.55.49.19	PTR	www.yorklibraries.org
72.55.49.68	A+PTR	zixvpm.mhyork.org
72.55.60.19	PTR	www.bhprsd.org
72.55.60.19	A	highlandrhs.org