Robtex

Up: 204.13.0.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 204.13.0.0/23
Down right: 204.13.2.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
204.13.0.20	PTR	vlan293-20.digiport.us
204.13.0.21	PTR	vlan293-21.digiport.us
204.13.0.58	PTR	static.digiport.com
204.13.0.62	PTR	static.digiport.com
204.13.0.100	A	fundacionrbd.org
204.13.0.106	PTR	mail.fostercarereview.org
204.13.0.109	PTR	static.digiport.com
204.13.0.227	PTR	ns1.concanon.net
204.13.0.227	A	ns1.wetsystems.com
204.13.0.228	PTR	ns2.concanon.net
204.13.0.230	PTR	mail.sciantaanalytics.com
204.13.0.230	A	www.justcobras.com
204.13.0.230	A	www.wetsystems.com
204.13.0.232	PTR	taveuni.concanon.net
204.13.0.232	A	mail.worldofadventure.com
204.13.0.232	A	mail.intrepidgeek.com
204.13.0.233	A	mail.concanon.com
204.13.0.234	PTR	host234.concanon.net
204.13.0.236	PTR	host236.concanon.net
204.13.0.238	PTR	host238.concanon.net
204.13.0.238	A	mail.beachtvl.com
204.13.0.239	PTR	host239.concanon.net
204.13.0.239	A	www.worldofdiving.com
204.13.0.239	A	worldofdiving.com
204.13.0.250	A	test.concanon.net
204.13.0.251	PTR	host251.concanon.net
204.13.0.251	A	southbaystradingpost.com
204.13.0.251	A	southbaytradingpost.com
204.13.1.23	PTR	static.digiport.com
204.13.1.42	PTR	smtp.assurancemgmt.net
204.13.1.84	PTR	frell.cc
204.13.1.84	A	five-horizons.com
204.13.1.90	A	mail.lists.digiport.com
204.13.1.100	PTR	www.flexoffers.com
204.13.1.103	A	mail.24-7communications.net
204.13.1.103	A	24-7communications.net
204.13.1.103	A	ns1.24-7communications.net
204.13.1.122	PTR	achieveorgasms.com
204.13.1.122	A	ninjasmoker.com
204.13.1.123	A	ns1.buckmatch.com
204.13.1.124	A	ns2.buckmatch.com
204.13.1.125	A	*.buckmatch.com
204.13.1.125	A	www.bikeamericaracing.com
204.13.1.125	A	mail.bikeamericaracing.com
204.13.1.131	A	estcustomers.com
204.13.1.131	A	itvcphone.com
204.13.1.202	PTR	u224-ikmultimedia-202.digiport.com
204.13.2.2	A+PTR	core01.net.digiport.com
204.13.2.3	A+PTR	0084-inetuplink.net.digiport.com
204.13.2.65	PTR	dns01.digiport.com
204.13.2.65	A	dns01.digiport.us
204.13.2.66	PTR	dns02.digiport.com
204.13.3.29	A	tvellas.org
204.13.3.34	PTR	mail.digiport.com
204.13.3.67	PTR	static.digiport.com
204.13.3.89	A+PTR	0074-guillermo.net.digiport.com
204.13.3.104	PTR	u289-brandsinstitute-104.digiport.com
204.13.3.104	A	brandpoll.com
204.13.3.119	PTR	u289-brandsinstitute-119.digiport.com
204.13.3.133	PTR	web.crdusa.net
204.13.3.181	PTR	srv04.voip.digiport.com
204.13.3.181	A	webtropic.com
204.13.3.181	A	*.fortknoxvault.com
204.13.3.189	A	mail.fortknoxvault.com
204.13.3.189	A	mail.singlejingles.com
204.13.3.189	A	mail.webtropic.com
204.13.3.231	A	mail.12tel.com
204.13.3.233	A	www.12tel.com
204.13.3.233	A	ns2.12tel.com
204.13.3.233	A	*.12tel.com
204.13.3.244	PTR	voip.eatonwolk.com