Robtex

Up: 186.12.0.0/16
Can't show all results, try to descend to a more specific CIDR
Down left: 186.12.128.0/18
Down right: 186.12.192.0/18
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
186.12.129.1	PTR	host1.186-12-129.telmex.net.ar
186.12.129.2	PTR	host2.186-12-129.telmex.net.ar
186.12.131.1	PTR	host1.186-12-131.telmex.net.ar
186.12.131.3	PTR	host3.186-12-131.telmex.net.ar
186.12.131.128	PTR	host128.186-12-131.telmex.net.ar
186.12.131.129	PTR	host129.186-12-131.telmex.net.ar
186.12.131.130	PTR	host130.186-12-131.telmex.net.ar
186.12.131.131	PTR	host131.186-12-131.telmex.net.ar
186.12.136.2	PTR	host2.186-12-136.telmex.net.ar
186.12.136.129	PTR	host129.186-12-136.telmex.net.ar
186.12.139.1	PTR	host1.186-12-139.telmex.net.ar
186.12.139.2	PTR	host2.186-12-139.telmex.net.ar
186.12.139.3	PTR	host3.186-12-139.telmex.net.ar
186.12.143.4	PTR	host4.186-12-143.telmex.net.ar
186.12.143.5	PTR	host5.186-12-143.telmex.net.ar
186.12.143.136	PTR	host136.186-12-143.telmex.net.ar
186.12.148.2	PTR	host2.186-12-148.telmex.net.ar
186.12.148.4	PTR	host4.186-12-148.telmex.net.ar
186.12.148.129	PTR	host129.186-12-148.telmex.net.ar
186.12.151.103	PTR	host103.186-12-151.telmex.net.ar
186.12.151.103	A	eoimjnze.com
186.12.160.102	PTR	host102.186-12-160.telmex.net.ar
186.12.160.102	A	www.pueyrredon2679.com.ar
186.12.160.102	A	pueyrredon2679.com.ar
186.12.166.108	PTR	host108.186-12-166.telmex.net.ar
186.12.170.1	PTR	host1.186-12-170.telmex.net.ar
186.12.170.3	PTR	host3.186-12-170.telmex.net.ar
186.12.179.2	PTR	host2.186-12-179.telmex.net.ar
186.12.179.130	PTR	host130.186-12-179.telmex.net.ar
186.12.183.2	PTR	host2.186-12-183.telmex.net.ar
186.12.183.3	PTR	host3.186-12-183.telmex.net.ar
186.12.184.1	PTR	host1.186-12-184.telmex.net.ar
186.12.199.37	PTR	host37.186-12-199.telmex.net.ar
186.12.199.181	PTR	host181.186-12-199.telmex.net.ar
186.12.212.99	PTR	host99.186-12-212.telmex.net.ar
186.12.213.123	PTR	host123.186-12-213.telmex.net.ar
186.12.213.169	PTR	host169.186-12-213.telmex.net.ar
186.12.219.192	PTR	host192.186-12-219.telmex.net.ar
186.12.219.252	PTR	host252.186-12-219.telmex.net.ar
186.12.221.4	PTR	host4.186-12-221.telmex.net.ar
186.12.221.128	PTR	host128.186-12-221.telmex.net.ar
186.12.231.1	PTR	host1.186-12-231.telmex.net.ar
186.12.234.32	A	conslear.ddns.net
186.12.237.128	PTR	host128.186-12-237.telmex.net.ar
186.12.238.1	PTR	host1.186-12-238.telmex.net.ar
186.12.238.3	PTR	host3.186-12-238.telmex.net.ar
186.12.238.54	A	vpnmovil.claro.com.py
186.12.239.32	A	initial-ipsecrouter.sc.claro.com.ar
186.12.248.4	PTR	host4.186-12-248.telmex.net.ar
186.12.251.2	PTR	host2.186-12-251.telmex.net.ar
186.12.251.3	PTR	host3.186-12-251.telmex.net.ar
186.12.251.6	A	dns1.armada.mil.ar
186.12.252.36	PTR	host36.186-12-252.telmex.net.ar
186.12.252.167	PTR	host167.186-12-252.telmex.net.ar
186.12.254.10	PTR	host10.186-12-254.telmex.net.ar
186.12.254.10	A	ns2.claro.com.ar