Robtex

Up: 143.255.136.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 143.255.140.0/23
Down right: 143.255.142.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
143.255.140.2	PTR	dns.giganet.net.py
143.255.140.2	A	webmail.jhstelecom.com.br
143.255.140.2	A	www.giganet.com.py
143.255.140.3	PTR	cpanel.giganet.com.py
143.255.140.4	PTR	143-255-140-4.giganet.net.py
143.255.140.4	A	ns2.giganet.net.py
143.255.140.4	A	ns1.giganet.com.py
143.255.140.5	PTR	5.140.255.143.giganet.net.py
143.255.140.5	A	painelcspp.dyndns.tv
143.255.140.170	PTR	170.140.255.143.giganet.net.py
143.255.140.174	PTR	174.140.255.143.giganet.net.py
143.255.140.194	PTR	194.140.255.143.giganet.net.py
143.255.140.208	PTR	208.140.255.143.giganet.net.py
143.255.140.247	PTR	247.140.255.143.giganet.net.py
143.255.140.247	A	ofiplusweb.com
143.255.140.247	A	evolucionsrl.com
143.255.141.88	PTR	88.141.255.143.giganet.net.py
143.255.142.139	PTR	139.142.255.143.giganet.net.py
143.255.142.202	PTR	202.142.255.143.giganet.net.py
143.255.142.202	A	ruta7transportes.com
143.255.142.254	PTR	254.142.255.143.giganet.net.py
143.255.143.44	PTR	44.143.255.143.giganet.net.py
143.255.143.44	A	mail.visaovipgamer.com
143.255.143.96	PTR	96.143.255.143.giganet.net.py
143.255.143.96	A	instagram.fagt1-1.fna.fbcdn.net
143.255.143.202	PTR	202.143.255.143.giganet.net.py
143.255.143.226	PTR	143-255-143-226.giganet.net.py