Robtex

Up: 177.11.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 177.11.16.0/23
Down right: 177.11.18.0/23

IP	Type	Hostname
177.11.16.1	PTR	router.g1telecom.net
177.11.16.6	PTR	prx1.g1telecom.net
177.11.16.7	A+PTR	sip.g1telecom.net
177.11.16.9	PTR	g1net-fx-177-11-16-9.g1telecom.net
177.11.16.10	PTR	177-11-16-10.g1telecom.net
177.11.16.12	PTR	g1net-fx-177-11-16-12.g1telecom.net
177.11.16.13	PTR	g1net-fx-177-11-16-13.g1telecom.net
177.11.16.17	PTR	177-11-16-17.g1telecom.net
177.11.16.53	PTR	177-11-16-53.g1telecom.net
177.11.16.75	A+PTR	srv1.g1telecom.net.br
177.11.16.144	PTR	177-11-16-144.g1telecom.net
177.11.16.245	PTR	177-11-16-245.g1telecom.net
177.11.16.249	PTR	g1net-fx-177-11-16-249.g1telecom.net
177.11.17.5	PTR	177-11-17-5.g1telecom.net
177.11.17.6	PTR	177-11-17-6.g1telecom.net
177.11.17.46	PTR	177-11-17-46.g1telecom.net
177.11.17.55	PTR	177-11-17-55.g1telecom.net
177.11.17.60	PTR	177-11-17-60.g1telecom.net
177.11.17.70	PTR	177-11-17-70.dynamic.g1telecom.net
177.11.17.185	PTR	177-11-17-185.dynamic.g1telecom.net
177.11.17.195	PTR	177-11-17-195.dynamic.g1telecom.net
177.11.17.195	A	guiapiresdorio.com.br
177.11.17.230	PTR	177-11-17-230.dynamic.g1telecom.net
177.11.19.218	PTR	177-11-19-218.g1telecom.net
177.11.19.221	PTR	177-11-19-221.g1telecom.net