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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
84,960 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 40.238.0.0/16 | 65.5k | ARIN |  US | 4th Dec 2023 |
| 40.239.0.0/16 | 65.5k | ARIN | US | 28th Sept 2022 |
| 40.24.0.0/16 | 65.5k | ARIN | US | 23rd Apr 1991 |
| 40.240.0.0/16 | 65.5k | ARIN | US | 23rd Apr 1991 |
| 40.241.0.0/16 | 65.5k | ARIN | US | 28th Jul 2022 |
| 40.242.0.0/16 | 65.5k | ARIN | US | 28th Jul 2022 |
| 40.243.0.0/16 | 65.5k | ARIN | US | 23rd Apr 1991 |
| 40.244.0.0/14 | 262k | ARIN | US | 23rd Apr 1991 |
| 40.25.0.0/16 | 65.5k | RIPE NCC |  GB | 23rd Apr 1991 |
| 40.26.0.0/16 | 65.5k | ARIN | US | 23rd Apr 1991 |
| 40.36.0.0/15 | 131k | ARIN | US | 23rd Apr 1991 |
| 40.40.0.0/14 | 262k | ARIN | US | 23rd Apr 1991 |
| 40.57.0.0/16 | 65.5k | ARIN | US | 23rd Apr 1991 |
| 41.139.64.0/18 | 16.4k | AFRINIC |  CI | 28th Feb 2020 |
| 41.188.192.0/18 | 16.4k | AFRINIC |  ZA | 27th Jan 2009 |
| 41.189.128.0/19 | 8.2k | AFRINIC | CI | 28th Feb 2020 |
| 41.189.96.0/19 | 8.2k | AFRINIC | CI | 28th Feb 2020 |
| 41.190.160.0/19 | 8.2k | AFRINIC | CI | 28th Feb 2020 |
| 41.190.192.0/19 | 8.2k | AFRINIC | CI | 28th Feb 2020 |
| 41.190.240.0/22 | 1k | AFRINIC | CI | 28th Feb 2020 |
| 41.190.252.0/22 | 1k | AFRINIC | CI | 28th Feb 2020 |
| 41.191.0.0/18 | 16.4k | AFRINIC | CI | 28th Feb 2020 |
| 41.191.108.0/22 | 1k | AFRINIC | CI | 28th Feb 2020 |
| 41.191.112.0/22 | 1k | AFRINIC | CI | 28th Feb 2020 |
| 41.191.124.0/22 | 1k | AFRINIC | ZA | 6th Nov 2008 |
| 41.191.128.0/19 | 8.2k | AFRINIC | ZA | 2nd Oct 2008 |
| 41.191.208.0/22 | 1k | AFRINIC | CI | 28th Feb 2020 |
| 41.191.92.0/22 | 1k | AFRINIC | CI | 28th Feb 2020 |
| 41.198.0.0/20 | 4.1k | AFRINIC |  MU | 14th May 2007 |
| 41.202.160.0/19 | 8.2k | AFRINIC |  SD | 16th Feb 2010 |
| 41.202.96.0/19 | 8.2k | AFRINIC | CI | 20th May 2010 |
| 41.205.160.0/19 | 8.2k | AFRINIC | CI | 28th Feb 2020 |
| 41.206.224.0/19 | 8.2k | AFRINIC | CI | 28th Feb 2020 |
| 41.206.64.0/19 | 8.2k | AFRINIC | CI | 8th Mar 2007 |
| 41.207.224.0/22 | 1k | AFRINIC | CI | 28th Feb 2020 |
| 41.209.128.0/18 | 16.4k | AFRINIC | CI | 28th Feb 2020 |
| 41.211.192.0/18 | 16.4k | AFRINIC | CI | 28th Feb 2020 |
| 41.215.192.0/20 | 4.1k | AFRINIC | CI | 28th Feb 2020 |
| 41.215.224.0/21 | 2k | AFRINIC | CI | 28th Feb 2020 |
| 41.216.0.0/19 | 8.2k | AFRINIC | CI | 28th Feb 2020 |
| 41.216.240.0/20 | 4.1k | AFRINIC | CI | 28th Feb 2020 |
| 41.217.196.0/22 | 1k | AFRINIC | CI | 28th Feb 2020 |
| 41.217.208.0/22 | 1k | AFRINIC | CI | 28th Feb 2020 |
| 41.217.248.0/21 | 2k | AFRINIC | CI | 28th Feb 2020 |
| 41.219.192.0/18 | 16.4k | AFRINIC | CI | 28th Feb 2020 |
| 41.221.112.0/20 | 4.1k | AFRINIC | CI | 28th Feb 2020 |
| 41.222.144.0/21 | 2k | AFRINIC |  NG | 11th Nov 2020 |
| 41.222.160.0/21 | 2k | AFRINIC | ZA | 11th Jul 2008 |
| 41.222.40.0/21 | 2k | AFRINIC | NG | 18th Oct 2006 |
| 41.222.80.0/21 | 2k | AFRINIC | CI | 28th Feb 2020 |