Robtex

Up: 64.89.0.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 64.89.0.0/21
Down right: 64.89.8.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
64.89.0.67	PTR	64-89-0-67.static.wntpr.net
64.89.0.131	PTR	64-89-0-131.static.wntpr.net
64.89.0.225	PTR	64-89-0-225.static.wntpr.net
64.89.1.33	A+PTR	mx1.delacruz.com
64.89.1.33	A	mail.delacruz.com
64.89.1.58	A	surgicalsolutionspr.info
64.89.1.98	PTR	64-89-1-98.static.wntpr.net
64.89.1.129	PTR	64-89-1-129.static.wntpr.net
64.89.1.144	PTR	64-89-1-144.static.wntpr.net
64.89.1.147	PTR	64-89-1-147.static.wntpr.net
64.89.1.147	A	mail.phasorinc.com
64.89.1.149	A	mail.phasorinc.com
64.89.1.149	A	mail.phasorengineering.com
64.89.1.160	PTR	64-89-1-160.static.wntpr.net
64.89.1.161	PTR	64-89-1-161.static.wntpr.net
64.89.1.163	PTR	64-89-1-163.static.wntpr.net
64.89.1.177	PTR	64-89-1-177.static.wntpr.net
64.89.1.211	PTR	64-89-1-211.static.wntpr.net
64.89.1.224	PTR	64-89-1-224.static.wntpr.net
64.89.1.225	PTR	64-89-1-225.static.wntpr.net
64.89.1.229	A	munsangerman.no-ip.info
64.89.1.229	A	mail.municipiodesangerman.com
64.89.2.58	PTR	64-89-2-58.static.wntpr.net
64.89.2.180	PTR	64-89-2-180.static.wntpr.net
64.89.2.180	A	axcare.com
64.89.2.180	A	www.centralrx.com
64.89.2.214	PTR	64-89-2-214.static.wntpr.net
64.89.2.214	A	www.generans.com
64.89.2.214	A	jajome.com
64.89.2.250	PTR	64-89-2-250.static.wntpr.net
64.89.2.253	A	bphpr.net
64.89.2.253	A	*.bphpr.net
64.89.2.253	A	mail.bphpr.net
64.89.3.19	PTR	64-89-3-19.static.wntpr.net
64.89.3.139	A	sjc.saintjosephcathedral.com
64.89.3.193	PTR	64-89-3-193.static.wntpr.net
64.89.3.202	A	*.telenetworkspr.com
64.89.4.2	PTR	64-89-4-2static.wntpr.net
64.89.4.21	PTR	mail.beewee.com
64.89.4.73	PTR	warrendelcaribe.com
64.89.4.98	PTR	64-89-4-98.static.wntpr.net
64.89.4.114	PTR	pr.gov
64.89.4.114	A	adfan.pr.gov
64.89.4.114	A	server.adfan.pr.gov
64.89.4.194	A	alpha.linkactiv.net
64.89.4.199	A	linkactiv.com
64.89.4.200	A	www.citaswebpr.com
64.89.4.200	A	citaswebpr.com
64.89.5.142	PTR	64-89-5-142.static.wntpr.net
64.89.6.2	A+PTR	mail.fullergrouppr.net
64.89.6.3	A+PTR	mail.fullergrouppr.com
64.89.6.4	A	fullergrouppr.com
64.89.6.81	A	nailers.1st.net
64.89.6.130	A	mail.cyberdivan.com
64.89.6.137	A	mail.sizzlerpr.com
64.89.6.137	A	portallonghornpr.com
64.89.6.137	A	mail.longhornpr.com
64.89.6.145	PTR	64-89-6-145.static.wntpr.net
64.89.6.145	A	mall.1st.net
64.89.6.177	PTR	mail.naranjitobrilla.com
64.89.6.254	A	gateway1.webweaver.colo.1st.net
64.89.7.202	A	prpamail.prpa.gobierno.pr
64.89.7.202	A	mail.prpa.pr.gov
64.89.7.202	A	mail.prpa.gobierno.pr
64.89.8.49	A	km002.biz
64.89.8.201	A	oglebay.1st.net
64.89.9.33	A	valleycinema3.1st.net
64.89.9.49	PTR	64-89-9-49.static.wntpr.net
64.89.9.69	A	mail2.atentousa.com
64.89.9.70	A	guaguapr.com
64.89.9.70	A	caribetrack.com
64.89.9.70	A	mail.caribetrackpr.com
64.89.9.83	A	uovrtl.1st.net
64.89.9.95	A	tintman01.1st.net
64.89.9.114	PTR	64-89-9-114.static.wntpr.net
64.89.9.114	A	valleye.1st.net
64.89.9.114	A	valleye.speed1.net
64.89.9.141	A	caribbeanfranchisepr.com
64.89.9.226	A	relayforlife.1st.net
64.89.9.233	A	www.dhdata.com
64.89.9.237	A	mail.dlf.pr.gov
64.89.9.237	A	dlf.pr.gov
64.89.9.248	A	fromtheheart.1st.net
64.89.9.253	A	ssl4.1st.net
64.89.10.2	PTR	64-89-10-2.static.wntpr.net
64.89.10.27	A	markhenry.1st.net
64.89.10.141	A	farmaciabelmonte.com
64.89.10.141	A	mail.farmaciabelmonte.com
64.89.10.177	A	theunknown.1st.net
64.89.10.221	A	pcelements.com
64.89.10.225	A	lwlpartners.com
64.89.11.26	A	ns2.scf-pr.com
64.89.12.2	A	fatman.1st.net
64.89.12.221	A	corporatpr.com
64.89.12.221	A	fd-cci.com
64.89.13.3	A+PTR	mail.camarapr.net
64.89.13.3	A	*.camarapr.net
64.89.13.3	A	camarapr.net
64.89.13.81	A	mail.profamiliapr.org
64.89.13.93	A	64-89-13-93.static.wntpr.com
64.89.13.97	A	webmail.centroararat.org
64.89.13.234	A	nc2k.newcomm2000.com
64.89.14.194	A	mail.med-bio.com
64.89.14.225	A	mail.hcccpa.com
64.89.15.114	PTR	64-89-15-114.static.wntpr.net
64.89.15.225	PTR	64-89-15-225.static.wntpr.net
64.89.15.237	A	mail.aatours.net
64.89.15.237	A	mail.aatours.com