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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through ARIN, largest first.
Unannounced blocks registered through ARIN
30,479 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 206.130.72.0/24 | 256 | ARIN |  US | 1st Jul 2026 |
| 206.130.73.0/24 | 256 | ARIN |  CA | 4th Jan 1996 |
| 206.130.74.0/24 | 256 | ARIN | CA | 5th Jan 1996 |
| 206.130.76.0/24 | 256 | ARIN | CA | 18th Jan 1996 |
| 206.130.77.0/24 | 256 | ARIN | CA | 18th Jan 1996 |
| 206.130.78.0/24 | 256 | ARIN | CA | 25th Jan 1996 |
| 206.130.79.0/24 | 256 | ARIN | CA | 24th Jan 1996 |
| 206.130.92.0/24 | 256 | ARIN | CA | 27th Feb 1996 |
| 206.131.160.0/19 | 8.2k | ARIN | US | 2nd Mar 1999 |
| 206.143.128.0/17 | 32.8k | ARIN | US | 9th Oct 1995 |
| 206.15.129.0/24 | 256 | ARIN | US | 25th May 1995 |
| 206.151.48.0/20 | 4.1k | ARIN | US | 6th Oct 1995 |
| 206.153.0.0/18 | 16.4k | ARIN | US | 6th Oct 1995 |
| 206.153.128.0/17 | 32.8k | ARIN | US | 6th Oct 1995 |
| 206.153.64.0/19 | 8.2k | ARIN | US | 6th Oct 1995 |
| 206.153.96.0/19 | 8.2k | ARIN | US | 6th Oct 1995 |
| 206.154.0.0/19 | 8.2k | ARIN | US | 6th Oct 1995 |
| 206.154.128.0/17 | 32.8k | ARIN | US | 6th Oct 1995 |
| 206.154.32.0/20 | 4.1k | ARIN | US | 6th Oct 1995 |
| 206.154.48.0/21 | 2k | ARIN | US | 6th Oct 1995 |
| 206.154.56.0/21 | 2k | ARIN | US | 6th Oct 1995 |
| 206.154.64.0/18 | 16.4k | ARIN | US | 6th Oct 1995 |
| 206.166.200.0/24 | 256 | ARIN | US | 6th Dec 2019 |
| 206.166.201.0/24 | 256 | ARIN | US | 3rd Apr 2025 |
| 206.166.221.0/24 | 256 | ARIN | US | 14th Dec 2018 |
| 206.167.1.0/24 | 256 | ARIN | US | 6th Mar 2009 |
| 206.167.2.0/24 | 256 | ARIN | CA | 28th Nov 1995 |
| 206.167.21.0/24 | 256 | ARIN | CA | 1st Dec 1995 |
| 206.167.22.0/24 | 256 | ARIN | US | 22nd Dec 1995 |
| 206.167.3.0/24 | 256 | ARIN | CA | 28th Nov 1995 |
| 206.167.30.0/24 | 256 | ARIN | CA | 16th Jan 1996 |
| 206.167.31.0/24 | 256 | ARIN | CA | 11th Jan 1996 |
| 206.167.34.0/24 | 256 | ARIN | CA | 11th Jan 1996 |
| 206.167.35.0/24 | 256 | ARIN | CA | 16th Jan 1996 |
| 206.167.4.0/22 | 1k | ARIN | CA | 17th Oct 1995 |
| 206.167.48.0/24 | 256 | ARIN | US | 16th Jan 1996 |
| 206.167.51.0/24 | 256 | ARIN | CA | 5th Feb 1996 |
| 206.167.53.0/24 | 256 | ARIN | CA | 29th Jan 1996 |
| 206.167.54.0/24 | 256 | ARIN | CA | 3rd May 1996 |
| 206.167.55.0/24 | 256 | ARIN | CA | 29th Jan 1996 |
| 206.167.56.0/24 | 256 | ARIN | CA | 15th Feb 1996 |
| 206.167.58.0/23 | 512 | ARIN | CA | 5th Feb 1996 |
| 206.167.60.0/24 | 256 | ARIN | CA | 5th Feb 1996 |
| 206.167.61.0/24 | 256 | ARIN | CA | 14th Feb 1996 |
| 206.167.62.0/24 | 256 | ARIN | CA | 13th Feb 1996 |
| 206.167.63.0/24 | 256 | ARIN | CA | 13th Feb 1996 |
| 206.167.78.0/24 | 256 | ARIN | CA | 17th Oct 1995 |
| 206.167.79.0/24 | 256 | ARIN | CA | 28th Feb 1996 |
| 206.168.113.0/24 | 256 | ARIN | CA | 23rd Mar 2023 |
| 206.168.115.0/24 | 256 | ARIN | US | 14th Nov 2023 |