Robtex

Up: 66.231.170.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 66.231.170.0/25
Down right: 66.231.170.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.231.170.7	A+PTR	voipmail.centixvoip.net
66.231.170.9	A	prnoc.att.com
66.231.170.12	PTR	12-170-231-66-static.centennialpr.net
66.231.170.12	A+PTR	labreservation.centixvoip.net
66.231.170.16	A+PTR	centennialpr.com
66.231.170.16	A+PTR	www.centennialpr.com
66.231.170.16	A	www.centennialpr.net
66.231.170.18	PTR	18-170-231-66-static.centennialpr.net
66.231.170.20	A+PTR	webacceleratoradmin.centennialpr.net
66.231.170.25	PTR	25-170-231-66-static.centennialpr.net
66.231.170.30	A	support.centennialpr.com
66.231.170.34	PTR	www.royalmotorspr.com
66.231.170.34	PTR	mailfilter.centennialpr.net
66.231.170.34	A	www.asiloyola.org
66.231.170.37	PTR	mail.spiderlink.net
66.231.170.38	PTR	mail.123yazmin.com
66.231.170.38	PTR	mail.alturahealthpr.com
66.231.170.38	PTR	mail.chccompr.com
66.231.170.39	A+PTR	mailfilter3.centennialpr.net
66.231.170.39	A	mail1.centennialpr.net
66.231.170.39	A	mail.santandernet.com
66.231.170.42	A+PTR	mailfilter2.centennialpr.net
66.231.170.44	A+PTR	mailfilter1.centennialpr.net
66.231.170.54	A+PTR	mail.attbusinesspr.com
66.231.170.54	PTR	54-170-231-66-static.centennialpr.net
66.231.170.54	A	attbusinesspr.com
66.231.170.60	A	mail.hmcprod.centennialpr.net
66.231.170.61	A+PTR	goemail.centennialpr.com
66.231.170.61	PTR	mail.ortopediapr.com
66.231.170.61	PTR	mail.primporting.com
66.231.170.70	PTR	smtp.goemail.centennialpr.com
66.231.170.72	PTR	72-170-231-66-static.centennialpr.net
66.231.170.73	PTR	ews2.centixvoip.net
66.231.170.74	A+PTR	sphone.centennialpr.net
66.231.170.74	A+PTR	sphone.centixvoip.net
66.231.170.91	A	ns5.centennialpr.net
66.231.170.96	PTR	96-170-231-66-static.centennialpr.net
66.231.170.96	A	aaa.centennialpr.net
66.231.170.99	A+PTR	myservices.centennialpr.net
66.231.170.102	A+PTR	evdo.centennialpr.net
66.231.170.102	PTR	evdo1.centennialpr.net
66.231.170.104	A	raqx.centennialpr.net
66.231.170.105	PTR	mail.centixvoip.net
66.231.170.105	A	mail.centixvoipnet.net
66.231.170.109	A	mail.centixvoip.net
66.231.170.111	PTR	novorad.net
66.231.170.111	PTR	www.novorad.net
66.231.170.127	A	exsmtp01.hmcdev.centennialpr.net
66.231.170.141	PTR	smtp.centennialpr.net
66.231.170.144	A+PTR	mailfilter3o.centennialpr.net
66.231.170.145	A	mailfilter4o.centennialpr.net
66.231.170.150	A	virtual.centennialpr.net
66.231.170.157	A	gl.centennialpr.net
66.231.170.177	PTR	atm5-1-1-hrh-7507-01.core.centix.net
66.231.170.179	PTR	gi0-2-601.snjupr1-br1.centix.net
66.231.170.180	A+PTR	gi0-2-601.snjupr1-br2.centix.net
66.231.170.198	A+PTR	smtp9.centennialpr.net
66.231.170.198	A	smtpauth.centennialpr.net
66.231.170.199	A+PTR	umvoicemail.centennialpr.com
66.231.170.200	PTR	webserver.jpcasket.com
66.231.170.201	A+PTR	cprwebb.centennialpr.com
66.231.170.201	A	umvoicemail.centennialpr.com
66.231.170.204	A+PTR	sfa.centennialpr.com
66.231.170.211	A+PTR	smtp2.centennialpr.net
66.231.170.214	PTR	214-170-231-66-static.centennialpr.net
66.231.170.214	A	mygoemail.net
66.231.170.217	A	nslvoip1.centennialpr.net
66.231.170.218	PTR	218-170-231-66-static.centennialpr.net
66.231.170.218	A	attnocpr.com
66.231.170.232	A	csip.centennialpr.net
66.231.170.234	A	www.freelifepuertorico.com
66.231.170.234	A	empigas.com
66.231.170.234	A	personal.isla.net
66.231.170.237	PTR	237-170-231-66-static.centennialpr.net
66.231.170.237	A	serviceportal.centennialpr.com
66.231.170.238	A	myaccount.centennialpr.com
66.231.170.247	A+PTR	centixvoip.net
66.231.170.248	A+PTR	cs1.centixvoip.net
66.231.170.253	A	is.centennialpr.net