Robtex

Up: 170.51.32.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 170.51.40.0/22
Down right: 170.51.44.0/22

IP	Type	Hostname
170.51.40.2	PTR	host2.170-51-40.telmex.net.ar
170.51.40.65	PTR	host65.170-51-40.claro.com.py
170.51.40.130	PTR	host130.170-51-40.claro.com.py
170.51.40.160	PTR	host160.170-51-40.claro.com.py
170.51.40.184	PTR	host184.170-51-40.claro.com.py
170.51.41.3	PTR	host3.170-51-41.claro.com.py
170.51.41.161	PTR	host161.170-51-41.claro.com.py
170.51.42.1	PTR	host1.170-51-42.claro.com.py
170.51.42.8	PTR	host8.170-51-42.claro.com.py
170.51.42.10	PTR	host10.170-51-42.claro.com.py
170.51.42.18	PTR	host18.170-51-42.claro.com.py
170.51.42.27	PTR	host27.170-51-42.claro.com.py
170.51.42.32	PTR	host32.170-51-42.claro.com.py
170.51.42.41	PTR	host41.170-51-42.claro.com.py
170.51.42.50	PTR	host50.170-51-42.claro.com.py
170.51.42.56	PTR	host56.170-51-42.claro.com.py
170.51.42.64	PTR	host64.170-51-42.claro.com.py
170.51.42.67	PTR	host67.170-51-42.claro.com.py
170.51.42.81	PTR	host81.170-51-42.claro.com.py
170.51.42.83	PTR	host83.170-51-42.claro.com.py
170.51.42.88	PTR	host88.170-51-42.claro.com.py
170.51.42.89	PTR	host89.170-51-42.claro.com.py
170.51.42.91	PTR	host91.170-51-42.claro.com.py
170.51.42.107	PTR	host107.170-51-42.claro.com.py
170.51.42.115	PTR	host115.170-51-42.claro.com.py
170.51.42.123	PTR	host123.170-51-42.claro.com.py
170.51.42.129	PTR	host129.170-51-42.claro.com.py
170.51.42.146	PTR	host146.170-51-42.claro.com.py
170.51.42.155	PTR	host155.170-51-42.claro.com.py
170.51.42.171	PTR	host171.170-51-42.claro.com.py
170.51.42.176	PTR	host176.170-51-42.claro.com.py
170.51.42.178	PTR	host178.170-51-42.claro.com.py
170.51.42.184	PTR	host184.170-51-42.claro.com.py
170.51.42.193	PTR	host193.170-51-42.claro.com.py
170.51.42.209	PTR	host209.170-51-42.claro.com.py
170.51.42.219	PTR	host219.170-51-42.claro.com.py
170.51.42.224	PTR	host224.170-51-42.claro.com.py
170.51.42.226	PTR	host226.170-51-42.claro.com.py
170.51.42.232	PTR	host232.170-51-42.claro.com.py
170.51.42.240	PTR	host240.170-51-42.claro.com.py
170.51.42.242	PTR	host242.170-51-42.claro.com.py
170.51.42.243	PTR	host243.170-51-42.claro.com.py
170.51.44.81	PTR	host81.170-51-44.telmex.net.ar
170.51.44.128	PTR	host128.170-51-44.telmex.net.ar
170.51.47.26	PTR	host26.170-51-47.claro.com.py
170.51.47.49	PTR	host49.170-51-47.claro.com.py
170.51.47.51	PTR	host51.170-51-47.telmex.net.ar
170.51.47.153	PTR	host153.170-51-47.claro.com.py