Robtex

Up: 177.21.0.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 177.21.8.0/22
Down right: 177.21.12.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
177.21.8.1	PTR	1.8.21.177.teletalk.net.br
177.21.9.75	PTR	177.21.9.75.teletalk.net.br
177.21.10.5	A	sip2.teletalk.com.br
177.21.10.26	PTR	rt.qsttelecom.com.br
177.21.10.34	PTR	mail.cardiopulmonar.net.br
177.21.10.64	PTR	64.10.21.177.teletalk.net.br
177.21.10.75	PTR	75.10.21.177.teletalk.net.br
177.21.10.75	A	webmail.camadaquatro.com.br
177.21.10.90	PTR	90.10.21.177.teletalk.net.br
177.21.11.1	PTR	177-21-11-1.host.teletalk.net.br
177.21.11.3	PTR	177-21-11-3.host.teletalk.net.br
177.21.11.3	A	mail.icpnet.com.br
177.21.11.4	A+PTR	ns1.cardiopulmonar.net.br
177.21.11.10	PTR	177-21-11-10.host.teletalk.net.br
177.21.11.10	A	mail.cardiopulmonar.net.br
177.21.11.11	PTR	177-21-11-11.host.teletalk.net.br
177.21.11.26	PTR	correio.brasquimica.com.br
177.21.11.98	PTR	177-21-11-98.host.teletalk.net.br
177.21.11.114	PTR	114.11.21.177.teletalk.net.br
177.21.11.132	A	fapex.com.br
177.21.11.132	A	fapex.org.br
177.21.11.132	A	www.fapex.org.br
177.21.11.143	A	siea.adm.br
177.21.11.208	PTR	208.11.21.177.teletalk.net.br
177.21.12.2	PTR	177-21-12-2.host.teletalk.net.br
177.21.12.93	PTR	93.12.21.177.teletalk.net.br
177.21.12.113	PTR	113.12.21.177.teletalk.net.br
177.21.12.116	PTR	116.12.21.177.teletalk.net.br
177.21.12.125	PTR	125.12.21.177.teletalk.net.br
177.21.13.140	A	gisminer.com
177.21.13.210	PTR	177-21-13-210.host.teletalk.net.br
177.21.13.229	A	coaraci.ba.gov.br
177.21.13.230	A	doem.org.br
177.21.15.16	PTR	177-21-15-16.host.teletalk.net.br
177.21.15.42	PTR	42.15.21.177.teletalk.net.br
177.21.15.64	PTR	177-21-15-64.host.teletalk.net.br
177.21.15.72	PTR	72.15.21.177.teletalk.net.br
177.21.15.106	PTR	106.15.21.177.teletalk.net.br
177.21.15.114	PTR	114.15.21.177.teletalk.net.br
177.21.15.121	PTR	177-21-15-121.host.teletalk.net.br
177.21.15.122	PTR	122.15.21.177.teletalk.net.br
177.21.15.122	A	alcobaca.ba.gov.br
177.21.15.122	A	acessoinformacao.org.br