Robtex

Up: 177.20.160.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 177.20.164.0/23
Down right: 177.20.166.0/23

IP	Type	Hostname
177.20.164.56	PTR	network-ppp177-164-56.prtelecom.com.br
177.20.164.104	PTR	network-ppp177-164-104.prtelecom.com.br
177.20.164.107	PTR	network-ppp177-164-107.prtelecom.com.br
177.20.164.173	PTR	network-ppp177-164-173.prtelecom.com.br
177.20.164.178	PTR	network-ppp177-164-178.prtelecom.com.br
177.20.165.17	PTR	network-ppp177-165-17.prtelecom.com.br
177.20.165.29	PTR	network-ppp177-165-29.prtelecom.com.br
177.20.165.40	PTR	network-ppp177-165-40.prtelecom.com.br
177.20.165.49	PTR	network-ppp177-165-49.prtelecom.com.br
177.20.165.66	PTR	network-ppp177-165-66.prtelecom.com.br
177.20.165.72	PTR	network-ppp177-165-72.prtelecom.com.br
177.20.165.75	PTR	network-ppp177-165-75.prtelecom.com.br
177.20.165.137	PTR	network-ppp177-165-137.prtelecom.com.br
177.20.165.138	PTR	network-ppp177-165-138.prtelecom.com.br
177.20.165.226	PTR	network-ppp177-165-226.prtelecom.com.br
177.20.166.42	PTR	network-ppp177-166-42.prtelecom.com.br
177.20.166.63	PTR	network-ppp177-166-63.prtelecom.com.br
177.20.166.64	PTR	network-ppp177-166-64.prtelecom.com.br
177.20.166.88	PTR	network-ppp177-166-88.prtelecom.com.br
177.20.166.96	PTR	network-ppp177-166-96.prtelecom.com.br
177.20.166.160	PTR	network-ppp177-166-160.prtelecom.com.br
177.20.166.178	PTR	network-ppp177-166-178.prtelecom.com.br
177.20.166.199	PTR	network-ppp177-166-199.prtelecom.com.br
177.20.166.226	PTR	network-ppp177-166-226.prtelecom.com.br
177.20.167.1	PTR	network-ppp177-167-1.prtelecom.com.br
177.20.167.1	A	sdr.appr.org.br
177.20.167.1	A	appr.org.br
177.20.167.6	PTR	network-ppp177-167-6.prtelecom.com.br
177.20.167.78	PTR	network-ppp177-167-78.prtelecom.com.br