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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
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Countries with the most unannounced blocks, largest first.
Unannounced blocks in Brazil
1,567 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 186.237.60.0/22 | 1k | LACNIC | BR | 17th Apr 2014 |
| 186.243.0.0/18 | 16.4k | LACNIC | BR | 22nd Sept 2010 |
| 186.250.148.0/22 | 1k | LACNIC | BR | 11th Jul 2012 |
| 186.251.236.0/22 | 1k | LACNIC | BR | 10th Dec 2010 |
| 186.251.36.0/23 | 512 | LACNIC | BR | 24th Oct 2025 |
| 187.16.192.0/19 | 8.2k | LACNIC | BR | 13th Dec 2010 |
| 187.19.64.0/20 | 4.1k | LACNIC | BR | 30th Dec 2008 |
| 187.94.48.0/24 | 256 | LACNIC | BR | 14th Sept 2009 |
| 187.94.50.0/23 | 512 | LACNIC | BR | 14th Sept 2009 |
| 187.94.52.0/23 | 512 | LACNIC | BR | 14th Sept 2009 |
| 187.94.54.0/24 | 256 | LACNIC | BR | 14th Sept 2009 |
| 187.94.57.0/24 | 256 | LACNIC | BR | 14th Sept 2009 |
| 187.94.58.0/23 | 512 | LACNIC | BR | 14th Sept 2009 |
| 187.94.60.0/22 | 1k | LACNIC | BR | 14th Sept 2009 |
| 187.95.192.0/20 | 4.1k | LACNIC | BR | 4th Nov 2009 |
| 189.12.208.0/20 | 4.1k | LACNIC | BR | 24th Oct 2006 |
| 189.89.254.0/24 | 256 | LACNIC | BR | 4th Mar 2008 |
| 190.109.88.0/22 | 1k | LACNIC | BR | 30th Apr 2015 |
| 190.111.102.0/23 | 512 | LACNIC | BR | 27th Feb 2020 |
| 190.112.128.0/22 | 1k | LACNIC | BR | 13th Jan 2020 |
| 190.83.92.0/22 | 1k | LACNIC | BR | 28th Feb 2020 |
| 191.0.96.0/19 | 8.2k | LACNIC | BR | 13th Jan 2014 |
| 191.128.29.0/24 | 256 | LACNIC | BR | 17th Mar 2014 |
| 191.128.30.0/23 | 512 | LACNIC | BR | 17th Mar 2014 |
| 191.128.96.0/20 | 4.1k | LACNIC | BR | 17th Mar 2014 |
| 191.160.32.0/22 | 1k | LACNIC | BR | 24th Oct 2013 |
| 191.215.0.0/19 | 8.2k | LACNIC | BR | 23rd Dec 2013 |
| 191.219.192.0/18 | 16.4k | LACNIC | BR | 11th Dec 2013 |
| 191.223.48.0/20 | 4.1k | LACNIC | BR | 11th Dec 2013 |
| 191.227.134.0/23 | 512 | LACNIC | BR | 4th Sept 2013 |
| 191.227.140.0/23 | 512 | LACNIC | BR | 4th Sept 2013 |
| 191.242.32.0/22 | 1k | LACNIC | BR | 17th Dec 2013 |
| 191.243.80.0/21 | 2k | LACNIC | BR | 23rd Dec 2013 |
| 191.253.128.0/18 | 16.4k | LACNIC | BR | 15th Jan 2014 |
| 191.253.80.0/20 | 4.1k | LACNIC | BR | 14th Jan 2014 |
| 191.36.238.0/24 | 256 | LACNIC | BR | 19th Mar 2014 |
| 191.7.128.0/21 | 2k | LACNIC | BR | 28th Feb 2014 |
| 191.7.35.0/24 | 256 | LACNIC | BR | 19th Feb 2014 |
| 192.100.214.0/23 | 512 | LACNIC | BR | 24th Oct 2025 |
| 192.146.157.0/24 | 256 | LACNIC | BR | 30th Jan 1992 |
| 192.80.209.0/24 | 256 | LACNIC | BR | 23rd May 1990 |
| 195.190.151.0/24 | 256 | RIPE NCC | BR | 13th Nov 2002 |
| 198.58.12.0/24 | 256 | LACNIC | BR | 2nd Mar 2015 |