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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 131.0.152.0/22 | 1k | LACNIC |  BR | 14th Jul 2014 |
| 131.0.36.0/22 | 1k | LACNIC | BR | 10th Jul 2014 |
| 131.100.112.0/22 | 1k | LACNIC | BR | 26th Aug 2014 |
| 131.100.32.0/22 | 1k | LACNIC | BR | 8th Aug 2014 |
| 131.108.96.0/22 | 1k | LACNIC | BR | 1st Sept 2014 |
| 131.221.152.0/22 | 1k | LACNIC | BR | 30th Apr 2026 |
| 138.121.68.0/22 | 1k | LACNIC | BR | 3rd Jun 2015 |
| 138.185.228.0/22 | 1k | LACNIC | BR | 7th Jul 2015 |
| 138.97.172.0/22 | 1k | LACNIC | BR | 30th Mar 2015 |
| 138.99.24.0/22 | 1k | LACNIC | BR | 13th Mar 2015 |
| 152.237.0.0/18 | 16.4k | LACNIC | BR | 15th May 2014 |
| 152.237.128.0/18 | 16.4k | LACNIC | BR | 15th May 2014 |
| 152.237.192.0/20 | 4.1k | LACNIC | BR | 13th Mar 2025 |
| 152.237.96.0/19 | 8.2k | LACNIC | BR | 15th May 2014 |
| 155.211.0.0/16 | 65.5k | LACNIC | BR | 26th Nov 1991 |
| 160.238.148.0/22 | 1k | LACNIC | BR | 16th May 2017 |
| 167.250.84.0/22 | 1k | LACNIC | BR | 14th Dec 2015 |
| 168.0.252.0/22 | 1k | LACNIC | BR | 11th Jan 2016 |
| 168.121.164.0/22 | 1k | LACNIC | BR | 5th Feb 2016 |
| 168.121.244.0/22 | 1k | LACNIC | BR | 5th Mar 2021 |
| 168.194.44.0/22 | 1k | LACNIC | BR | 28th Jul 2016 |
| 168.197.156.0/22 | 1k | LACNIC | BR | 14th Sept 2016 |
| 168.197.20.0/22 | 1k | LACNIC | BR | 6th Sept 2016 |
| 168.205.144.0/22 | 1k | LACNIC | BR | 7th Mar 2016 |
| 168.227.240.0/22 | 1k | LACNIC | BR | 31st Mar 2016 |
| 168.228.190.0/23 | 512 | LACNIC | BR | 14th Apr 2016 |
| 168.90.116.0/22 | 1k | LACNIC | BR | 15th Jan 2016 |
| 170.238.225.0/24 | 256 | LACNIC | BR | 6th Dec 2016 |
| 170.245.140.0/22 | 1k | LACNIC | BR | 20th Jan 2017 |
| 170.247.232.0/22 | 1k | LACNIC | BR | 17th Feb 2017 |
| 170.79.212.0/22 | 1k | LACNIC | BR | 17th Oct 2016 |
| 170.83.56.0/23 | 512 | LACNIC | BR | 10th Jan 2017 |
| 170.84.32.0/22 | 1k | LACNIC | BR | 20th May 2016 |
| 177.105.96.0/20 | 4.1k | LACNIC | BR | 11th Nov 2011 |
| 177.11.88.0/22 | 1k | LACNIC | BR | 28th Dec 2010 |
| 177.125.0.0/21 | 2k | LACNIC | BR | 22nd Dec 2011 |
| 177.125.181.0/24 | 256 | LACNIC | BR | 24th Mar 2023 |
| 177.125.183.0/24 | 256 | LACNIC | BR | 7th Mar 2012 |
| 177.126.12.0/24 | 256 | LACNIC | BR | 2nd Jan 2012 |
| 177.128.132.0/22 | 1k | LACNIC | BR | 3rd May 2013 |
| 177.136.48.0/20 | 4.1k | LACNIC | BR | 31st Jan 2012 |
| 177.154.16.0/22 | 1k | LACNIC | BR | 18th Jun 2013 |
| 177.154.94.0/24 | 256 | LACNIC | BR | 26th Jul 2013 |
| 177.2.192.0/18 | 16.4k | LACNIC | BR | 4th Nov 2010 |
| 177.21.152.0/23 | 512 | LACNIC | BR | 5th May 2025 |
| 177.3.128.0/20 | 4.1k | LACNIC | BR | 4th Nov 2010 |
| 177.39.4.0/22 | 1k | LACNIC | BR | 4th Mar 2011 |
| 177.52.38.0/23 | 512 | LACNIC | BR | 23rd Jul 2020 |
| 177.52.56.0/22 | 1k | LACNIC | BR | 19th Sept 2012 |
| 177.53.188.0/24 | 256 | LACNIC | BR | 26th Dec 2011 |