Robtex

Up: 186.0.128.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 186.0.136.0/22
Down right: 186.0.140.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
186.0.136.2	A+PTR	ns1.nortech.com.ar
186.0.136.2	A	ns1.radiofmlibre.com
186.0.136.2	A	ns1.microlanoestenet.com.ar
186.0.136.3	PTR	ns2.nortech.com.ar
186.0.136.51	PTR	servidor.nortech.com.ar
186.0.136.51	A	mail.cuntari.com.ar
186.0.136.51	A	cuntari.com.ar
186.0.136.60	A	cuntari.com.ar
186.0.136.60	A	smtp.nortech.com.ar
186.0.136.60	A	mail.witcom.com.ar
186.0.136.202	A+PTR	186.0.136.202.nortech.com.ar
186.0.138.1	A+PTR	186.0.138.1.nortech.com.ar
186.0.138.2	A+PTR	186.0.138.2.nortech.com.ar
186.0.138.7	A	186.0.138.7.nortech.com.ar
186.0.138.10	A+PTR	186.0.138.10.nortech.com.ar
186.0.138.14	A	186.0.138.14.nortech.com.ar
186.0.138.16	A+PTR	186.0.138.16.nortech.com.ar
186.0.138.17	A+PTR	186.0.138.17.nortech.com.ar
186.0.138.18	A	186.0.138.18.nortech.com.ar
186.0.138.19	A	186.0.138.19.nortech.com.ar
186.0.138.29	A	186.0.138.29.nortech.com.ar
186.0.138.32	A+PTR	186.0.138.32.nortech.com.ar
186.0.138.33	A+PTR	186.0.138.33.nortech.com.ar
186.0.138.41	A+PTR	186.0.138.41.nortech.com.ar
186.0.138.44	A	186.0.138.44.nortech.com.ar
186.0.138.46	A	186.0.138.46.nortech.com.ar
186.0.138.47	A	186.0.138.47.nortech.com.ar
186.0.138.48	A+PTR	186.0.138.48.nortech.com.ar
186.0.138.50	A+PTR	186.0.138.50.nortech.com.ar
186.0.138.54	A	186.0.138.54.nortech.com.ar
186.0.138.55	A	186.0.138.55.nortech.com.ar
186.0.138.56	A+PTR	186.0.138.56.nortech.com.ar
186.0.138.58	A+PTR	186.0.138.58.nortech.com.ar
186.0.138.62	A	186.0.138.62.nortech.com.ar
186.0.138.74	A+PTR	186.0.138.74.nortech.com.ar
186.0.138.75	A+PTR	186.0.138.75.nortech.com.ar
186.0.138.79	A	186.0.138.79.nortech.com.ar
186.0.138.80	A+PTR	186.0.138.80.nortech.com.ar
186.0.138.84	A	186.0.138.84.nortech.com.ar
186.0.138.86	A	186.0.138.86.nortech.com.ar
186.0.138.100	A	186.0.138.100.nortech.com.ar
186.0.138.104	A+PTR	186.0.138.104.nortech.com.ar
186.0.138.106	A+PTR	186.0.138.106.nortech.com.ar
186.0.138.110	A	186.0.138.110.nortech.com.ar
186.0.138.123	A+PTR	186.0.138.123.nortech.com.ar
186.0.138.129	A+PTR	186.0.138.129.nortech.com.ar
186.0.138.136	A+PTR	186.0.138.136.nortech.com.ar
186.0.138.143	A	186.0.138.143.nortech.com.ar
186.0.138.145	A+PTR	186.0.138.145.nortech.com.ar
186.0.138.155	A+PTR	186.0.138.155.nortech.com.ar
186.0.138.157	A	186.0.138.157.nortech.com.ar
186.0.138.160	A+PTR	186.0.138.160.nortech.com.ar
186.0.138.162	A+PTR	186.0.138.162.nortech.com.ar
186.0.138.163	A+PTR	186.0.138.163.nortech.com.ar
186.0.138.164	A	186.0.138.164.nortech.com.ar
186.0.138.168	A+PTR	186.0.138.168.nortech.com.ar
186.0.138.169	A+PTR	186.0.138.169.nortech.com.ar
186.0.138.174	A	186.0.138.174.nortech.com.ar
186.0.138.176	A+PTR	186.0.138.176.nortech.com.ar
186.0.138.177	A+PTR	186.0.138.177.nortech.com.ar
186.0.138.179	A+PTR	186.0.138.179.nortech.com.ar
186.0.138.182	A	186.0.138.182.nortech.com.ar
186.0.138.193	A+PTR	186.0.138.193.nortech.com.ar
186.0.138.195	A+PTR	186.0.138.195.nortech.com.ar
186.0.138.197	A	186.0.138.197.nortech.com.ar
186.0.138.202	A+PTR	186.0.138.202.nortech.com.ar
186.0.138.203	A+PTR	186.0.138.203.nortech.com.ar
186.0.138.216	A+PTR	186.0.138.216.nortech.com.ar
186.0.138.222	A	186.0.138.222.nortech.com.ar
186.0.138.230	A	186.0.138.230.nortech.com.ar
186.0.138.231	A	186.0.138.231.nortech.com.ar
186.0.138.232	A+PTR	186.0.138.232.nortech.com.ar
186.0.138.235	A+PTR	186.0.138.235.nortech.com.ar
186.0.138.242	A+PTR	186.0.138.242.nortech.com.ar
186.0.138.244	A	186.0.138.244.nortech.com.ar
186.0.138.249	A+PTR	186.0.138.249.nortech.com.ar
186.0.138.253	A	186.0.138.253.nortech.com.ar
186.0.138.254	A	186.0.138.254.nortech.com.ar
186.0.139.250	A+PTR	186.0.139.250.nortech.com.ar
186.0.141.189	A	186.0.141.189.nortech.com.ar
186.0.141.202	A+PTR	186.0.141.202.nortech.com.ar
186.0.142.3	A+PTR	186.0.142.3.nortech.com.ar
186.0.142.14	A	186.0.142.14.nortech.com.ar
186.0.142.95	A	186.0.142.95.nortech.com.ar
186.0.142.156	A	186.0.142.156.nortech.com.ar
186.0.142.252	A	fmlibreradio.com
186.0.142.252	A	mail.radiofmlibre.com
186.0.142.252	A	estacionexilio.com.ar
186.0.143.48	A+PTR	186.0.143.48.nortech.com.ar
186.0.143.50	PTR	186.0.143.50.nortech.com.ar
186.0.143.69	A	186.0.143.69.nortech.com.ar
186.0.143.90	A+PTR	186.0.143.90.nortech.com.ar
186.0.143.129	A+PTR	186.0.143.129.nortech.com.ar
186.0.143.131	A+PTR	186.0.143.131.nortech.com.ar
186.0.143.230	A	186.0.143.230.nortech.com.ar