Allocated but unannounced space
Every block here was allocated or assigned by a regional internet registry, and none of them appeared in any routing table we collected at our last snapshot — neither as a route of their own, nor covered by a larger announcement, nor carved up into more specifics.
“Unannounced” does not mean “unused”
Plenty of allocated space is deliberately kept off the public internet: private interconnects, lab and lawful-intercept ranges, networks reachable only inside one operator, and space held in reserve. Some of it is announced somewhere our collectors cannot see, which is a limit of our vantage points rather than a fact about the block.
It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today. Nothing on this page means a block is unallocated, available, or free to announce.
Browse by registry
Browse by country
Countries with unannounced space registered through LACNIC, largest first.
Unannounced blocks registered through LACNIC
4,651 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 179.237.42.0/23 | 512 | LACNIC |  BR | 10th Dec 2012 |
| 179.237.44.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.46.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.48.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.50.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.52.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.54.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.56.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.58.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.60.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.62.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.49.240.0/22 | 1k | LACNIC | BR | 17th Aug 2020 |
| 179.51.252.0/22 | 1k | LACNIC |  BZ | 7th Nov 2013 |
| 179.61.0.0/21 | 2k | LACNIC |  AR | 6th Dec 2013 |
| 179.61.32.0/19 | 8.2k | LACNIC |  AW | 10th Dec 2013 |
| 179.63.232.0/22 | 1k | LACNIC |  CL | 28th May 2013 |
| 181.189.48.0/22 | 1k | LACNIC | BR | 7th Dec 2021 |
| 181.189.84.0/22 | 1k | LACNIC | BR | 8th Dec 2021 |
| 181.199.172.0/22 | 1k | LACNIC | AR | 22nd Jul 2013 |
| 181.199.192.0/20 | 4.1k | LACNIC |  MX | 23rd Jul 2013 |
| 181.224.160.0/22 | 1k | LACNIC |  CO | 2nd May 2013 |
| 181.224.164.0/23 | 512 | LACNIC |  UY | 11th Apr 2013 |
| 181.232.0.0/17 | 32.8k | LACNIC | CO | 21st Nov 2012 |
| 181.233.158.0/24 | 256 | LACNIC |  PY | 14th Dec 2021 |
| 181.233.192.0/18 | 16.4k | LACNIC |  PE | 6th Dec 2012 |
| 186.121.154.0/23 | 512 | LACNIC | AR | 16th Mar 2012 |
| 186.121.156.0/22 | 1k | LACNIC | AR | 16th Mar 2012 |
| 186.121.188.0/23 | 512 | LACNIC | AR | 16th Mar 2012 |
| 186.121.190.0/24 | 256 | LACNIC | AR | 16th Mar 2012 |
| 186.189.252.0/22 | 1k | LACNIC | AR | 13th Jun 2014 |
| 186.195.172.0/22 | 1k | LACNIC | BR | 10th May 2010 |
| 186.195.176.0/20 | 4.1k | LACNIC | BR | 28th Mar 2012 |
| 186.195.246.0/24 | 256 | LACNIC | AR | 30th Jun 2020 |
| 186.195.248.0/22 | 1k | LACNIC |  TT | 24th Jun 2020 |
| 186.196.15.0/24 | 256 | LACNIC | BR | 29th Mar 2010 |
| 186.196.16.0/20 | 4.1k | LACNIC | BR | 29th Mar 2010 |
| 186.196.32.0/20 | 4.1k | LACNIC | BR | 29th Mar 2010 |
| 186.196.64.0/22 | 1k | LACNIC | BR | 29th Mar 2010 |
| 186.196.68.0/22 | 1k | LACNIC | BR | 29th Mar 2010 |
| 186.196.72.0/23 | 512 | LACNIC | BR | 29th Mar 2010 |
| 186.196.74.0/24 | 256 | LACNIC | BR | 29th Mar 2010 |
| 186.196.75.0/24 | 256 | LACNIC | BR | 29th Mar 2010 |
| 186.196.77.0/24 | 256 | LACNIC | BR | 29th Mar 2010 |
| 186.196.80.0/20 | 4.1k | LACNIC | BR | 29th Mar 2010 |
| 186.196.96.0/19 | 8.2k | LACNIC | BR | 29th Mar 2010 |
| 186.208.92.0/22 | 1k | LACNIC | BR | 2nd Jul 2026 |
| 186.232.244.0/24 | 256 | LACNIC | BR | 9th Sept 2010 |
| 186.233.140.0/24 | 256 | LACNIC | BR | 2nd May 2012 |
| 186.233.232.0/22 | 1k | LACNIC | BR | 1st Oct 2010 |
| 186.233.248.0/22 | 1k | LACNIC | BR | 23rd Apr 2012 |