Robtex

Up: 177.37.52.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 177.37.52.0/24
Down right: 177.37.53.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
177.37.52.10	PTR	server52.com.br
177.37.52.10	A	ns1.servidor52.com.br
177.37.52.10	A	servidor52.com.br
177.37.52.11	A+PTR	mx1.servidor52.com.br
177.37.52.11	A	ns2.servidor52.com.br
177.37.52.60	PTR	socianet.info
177.37.52.60	A	mx50.servidor52.com.br
177.37.53.10	A+PTR	makebelieve.com.br
177.37.53.10	A	mta40.speed.eco.br
177.37.53.10	A	speed.eco.br
177.37.53.11	PTR	mail1.makebelieve.com.br
177.37.53.11	A	ns2.makebelieve.com.br
177.37.53.12	A	mta1.speed.eco.br
177.37.53.13	A+PTR	mta2.speed.eco.br
177.37.53.14	A+PTR	mta3.speed.eco.br
177.37.53.15	A+PTR	mta4.speed.eco.br
177.37.53.16	A+PTR	mta5.speed.eco.br
177.37.53.17	A+PTR	mta6.speed.eco.br
177.37.53.19	A	mta8.speed.eco.br
177.37.53.20	A	mta9.speed.eco.br
177.37.53.21	A	mta10.speed.eco.br
177.37.53.22	A	mta11.speed.eco.br
177.37.53.23	A	mta12.speed.eco.br
177.37.53.24	A+PTR	mta13.speed.eco.br
177.37.53.25	A	mta14.speed.eco.br
177.37.53.26	A	mta15.speed.eco.br
177.37.53.27	A	mta16.speed.eco.br
177.37.53.28	A	mta17.speed.eco.br
177.37.53.30	A	mta19.speed.eco.br
177.37.53.31	A	mta20.speed.eco.br
177.37.53.32	A+PTR	mta21.speed.eco.br
177.37.53.33	A	mta22.speed.eco.br
177.37.53.34	A	mta23.speed.eco.br
177.37.53.35	A	mta24.speed.eco.br
177.37.53.36	A+PTR	mta25.speed.eco.br
177.37.53.37	A	mta26.speed.eco.br
177.37.53.38	A	mta27.speed.eco.br
177.37.53.39	A	mta28.speed.eco.br
177.37.53.40	A	mta29.speed.eco.br
177.37.53.41	A	mta30.speed.eco.br
177.37.53.42	A	mta31.speed.eco.br
177.37.53.44	A	mta33.speed.eco.br
177.37.53.45	A	mta34.speed.eco.br
177.37.53.46	A	mta35.speed.eco.br
177.37.53.47	A	mta36.speed.eco.br
177.37.53.48	A+PTR	mta37.speed.eco.br
177.37.53.49	A	mta38.speed.eco.br
177.37.53.50	A	mta39.speed.eco.br
177.37.53.62	A	opcaoplanos.com.br
177.37.53.62	A	ns1.gruposulamerica.med.br
177.37.53.62	A	ns1.opcaoplanos.com.br
177.37.53.64	A	dc-22a362ddf7dc.healthfort.com.br
177.37.53.64	A	dc-4811ac575cab.sulamericaup.com.br