Robtex

Up: 146.23.8.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 146.23.8.0/23
Down right: 146.23.10.0/23

IP	Type	Hostname
146.23.8.20	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.8.21	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.8.53	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.8.60	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.8.80	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.8.140	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.8.189	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.8.221	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.8.238	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.8.250	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.8.253	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.9.76	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.9.144	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.9.162	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.10.26	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.10.78	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.10.85	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.10.95	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.10.137	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.10.142	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.10.158	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.10.228	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.10.230	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.11.48	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.11.81	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.11.86	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.11.226	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.11.250	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa
146.23.11.251	PTR	non-routed-un-exposed-ip.23.146.in-addr.arpa