Robtex

Up: 166.138.128.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 166.138.144.0/21
Down right: 166.138.152.0/21

IP	Type	Hostname
166.138.145.1	PTR	mobile-166-138-145-001.mycingular.net
166.138.145.2	PTR	mobile-166-138-145-002.mycingular.net
166.138.145.34	PTR	mobile-166-138-145-034.mycingular.net
166.138.145.48	PTR	mobile-166-138-145-048.mycingular.net
166.138.145.64	PTR	mobile-166-138-145-064.mycingular.net
166.138.145.96	PTR	mobile-166-138-145-096.mycingular.net
166.138.145.97	PTR	mobile-166-138-145-097.mycingular.net
166.138.145.98	PTR	mobile-166-138-145-098.mycingular.net
166.138.145.163	PTR	mobile-166-138-145-163.mycingular.net
166.138.145.192	PTR	mobile-166-138-145-192.mycingular.net
166.138.145.193	PTR	mobile-166-138-145-193.mycingular.net
166.138.145.209	PTR	mobile-166-138-145-209.mycingular.net
166.138.145.211	PTR	mobile-166-138-145-211.mycingular.net
166.138.145.226	PTR	mobile-166-138-145-226.mycingular.net
166.138.145.241	PTR	mobile-166-138-145-241.mycingular.net
166.138.145.242	PTR	mobile-166-138-145-242.mycingular.net
166.138.148.2	PTR	mobile-166-138-148-002.mycingular.net
166.138.148.32	PTR	mobile-166-138-148-032.mycingular.net
166.138.148.35	PTR	mobile-166-138-148-035.mycingular.net
166.138.148.48	PTR	mobile-166-138-148-048.mycingular.net
166.138.148.49	PTR	mobile-166-138-148-049.mycingular.net
166.138.148.50	PTR	mobile-166-138-148-050.mycingular.net
166.138.148.51	PTR	mobile-166-138-148-051.mycingular.net
166.138.148.66	PTR	mobile-166-138-148-066.mycingular.net
166.138.148.83	PTR	mobile-166-138-148-083.mycingular.net
166.138.148.114	PTR	mobile-166-138-148-114.mycingular.net
166.138.148.129	PTR	mobile-166-138-148-129.mycingular.net
166.138.148.130	PTR	mobile-166-138-148-130.mycingular.net
166.138.148.144	PTR	mobile-166-138-148-144.mycingular.net
166.138.148.162	PTR	mobile-166-138-148-162.mycingular.net
166.138.148.177	PTR	mobile-166-138-148-177.mycingular.net
166.138.148.194	PTR	mobile-166-138-148-194.mycingular.net
166.138.148.195	PTR	mobile-166-138-148-195.mycingular.net
166.138.148.209	PTR	mobile-166-138-148-209.mycingular.net
166.138.148.210	PTR	mobile-166-138-148-210.mycingular.net
166.138.148.243	PTR	mobile-166-138-148-243.mycingular.net
166.138.149.0	PTR	mobile-166-138-149-000.mycingular.net
166.138.153.2	PTR	mobile-166-138-153-002.mycingular.net
166.138.153.3	PTR	mobile-166-138-153-003.mycingular.net
166.138.153.17	PTR	mobile-166-138-153-017.mycingular.net
166.138.153.32	PTR	mobile-166-138-153-032.mycingular.net
166.138.153.34	PTR	mobile-166-138-153-034.mycingular.net
166.138.153.50	PTR	mobile-166-138-153-050.mycingular.net
166.138.153.51	PTR	mobile-166-138-153-051.mycingular.net
166.138.153.64	PTR	mobile-166-138-153-064.mycingular.net
166.138.153.80	PTR	mobile-166-138-153-080.mycingular.net
166.138.153.98	PTR	mobile-166-138-153-098.mycingular.net
166.138.153.99	PTR	mobile-166-138-153-099.mycingular.net
166.138.153.112	PTR	mobile-166-138-153-112.mycingular.net
166.138.153.113	PTR	mobile-166-138-153-113.mycingular.net
166.138.153.144	PTR	mobile-166-138-153-144.mycingular.net
166.138.153.162	PTR	mobile-166-138-153-162.mycingular.net
166.138.153.194	PTR	mobile-166-138-153-194.mycingular.net
166.138.153.210	PTR	mobile-166-138-153-210.mycingular.net
166.138.153.241	PTR	mobile-166-138-153-241.mycingular.net
166.138.153.243	PTR	mobile-166-138-153-243.mycingular.net