Robtex

Up: 189.203.22.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 189.203.23.0/25
Down right: 189.203.23.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
189.203.23.0	PTR	fixed-203-23-189-203-23-0.iusacell.net
189.203.23.1	A+PTR	fixed-203-23-189-203-23-1.iusacell.net
189.203.23.2	PTR	fixed-203-23-189-203-23-2.iusacell.net
189.203.23.3	A+PTR	fixed-203-23-189-203-23-3.iusacell.net
189.203.23.4	A+PTR	fixed-203-23-189-203-23-4.iusacell.net
189.203.23.5	PTR	fixed-203-23-189-203-23-5.iusacell.net
189.203.23.6	PTR	fixed-203-23-189-203-23-6.iusacell.net
189.203.23.7	A+PTR	fixed-203-23-189-203-23-7.iusacell.net
189.203.23.8	PTR	fixed-203-23-189-203-23-8.iusacell.net
189.203.23.9	A+PTR	fixed-203-23-189-203-23-9.iusacell.net
189.203.23.10	PTR	fixed-203-23-189-203-23-10.iusacell.net
189.203.23.11	PTR	fixed-203-23-189-203-23-11.iusacell.net
189.203.23.12	PTR	fixed-203-23-189-203-23-12.iusacell.net
189.203.23.13	PTR	fixed-203-23-189-203-23-13.iusacell.net
189.203.23.14	PTR	fixed-203-23-189-203-23-14.iusacell.net
189.203.23.15	PTR	fixed-203-23-189-203-23-15.iusacell.net
189.203.23.16	PTR	fixed-203-23-189-203-23-16.iusacell.net
189.203.23.17	PTR	fixed-203-23-189-203-23-17.iusacell.net
189.203.23.18	PTR	fixed-203-23-189-203-23-18.iusacell.net
189.203.23.19	PTR	fixed-203-23-189-203-23-19.iusacell.net
189.203.23.68	A+PTR	fixed-189-203-23-68.totalplay.net
189.203.23.116	PTR	fixed-203-23-116.iusacell.net
189.203.23.122	A+PTR	fixed-189-203-23-122.totalplay.net
189.203.23.136	PTR	fixed-203-23-189-203-23-136.iusacell.net
189.203.23.136	A	befincomun.com
189.203.23.162	A+PTR	www.tedf.org.mx
189.203.23.162	A	tedf.org.mx
189.203.23.163	A+PTR	autodiscover.tedf.org.mx
189.203.23.163	A+PTR	mail.tedf.org.mx
189.203.23.163	A+PTR	server4.tedf.org.mx
189.203.23.167	A+PTR	themis.tedf.org.mx
189.203.23.186	A	itvc.mx
189.203.23.242	A+PTR	fixed-189-203-23-242.totalplay.net