Robtex

Up: 170.231.152.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 170.231.156.0/23
Down right: 170.231.158.0/23

IP	Type	Hostname
170.231.156.1	A+PTR	170-231-156-1.netforcetelecom.com.br
170.231.156.1	A	www.netforcetelecom.com.br
170.231.156.1	A	netforcetelecom.com.br
170.231.156.122	A+PTR	170-231-156-122.netforcetelecom.com.br
170.231.156.122	A+PTR	dns1.netforcetelecom.com.br
170.231.156.123	A+PTR	dns2.netforcetelecom.com.br
170.231.156.123	A+PTR	170-231-156-123.netforcetelecom.com.br