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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
30,461 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 208.88.40.0/22 | 1k | ARIN |  US | 10th Mar 2008 |
| 208.88.64.0/24 | 256 | ARIN | US | 28th Jan 2026 |
| 208.88.80.0/22 | 1k | ARIN | US | 12th Mar 2008 |
| 208.89.11.0/24 | 256 | ARIN | US | 3rd Apr 2008 |
| 208.89.136.0/22 | 1k | ARIN | US | 22nd Apr 2008 |
| 208.89.184.0/22 | 1k | ARIN | US | 24th Apr 2008 |
| 208.89.188.0/22 | 1k | ARIN | US | 24th Apr 2008 |
| 208.89.192.0/21 | 2k | ARIN | US | 25th Apr 2008 |
| 208.89.4.0/22 | 1k | ARIN | US | 3rd Apr 2008 |
| 208.89.56.0/22 | 1k | ARIN | US | 10th Apr 2008 |
| 208.89.68.0/23 | 512 | ARIN | US | 11th Apr 2008 |
| 208.89.71.0/24 | 256 | ARIN | US | 11th Apr 2008 |
| 208.89.80.0/22 | 1k | ARIN | US | 14th Apr 2008 |
| 208.89.88.0/22 | 1k | ARIN | US | 14th Apr 2008 |
| 208.89.9.0/24 | 256 | ARIN | US | 3rd Apr 2008 |
| 208.90.208.0/22 | 1k | ARIN | US | 16th May 2008 |
| 208.90.232.0/22 | 1k | ARIN |  CA | 20th May 2008 |
| 208.90.248.0/21 | 2k | ARIN | US | 22nd May 2008 |
| 208.90.44.0/22 | 1k | ARIN | US | 1st May 2008 |
| 208.91.0.0/22 | 1k | ARIN | US | 22nd May 2008 |
| 208.91.168.0/21 | 2k | ARIN | US | 11th Jun 2008 |
| 208.91.40.0/22 | 1k | ARIN | US | 29th May 2008 |
| 208.91.90.0/24 | 256 | ARIN | US | 14th Oct 2015 |
| 208.91.91.0/24 | 256 | ARIN | US | 2nd Jun 2008 |
| 208.92.112.0/21 | 2k | ARIN | CA | 2nd Jul 2008 |
| 208.92.124.0/22 | 1k | ARIN | US | 2nd Jul 2008 |
| 208.92.180.0/22 | 1k | ARIN | US | 9th Jul 2008 |
| 208.92.200.0/22 | 1k | ARIN | US | 10th Jul 2008 |
| 208.92.204.0/22 | 1k | ARIN | US | 14th Jul 2008 |
| 208.92.32.0/22 | 1k | ARIN | US | 25th Jun 2008 |
| 208.93.162.0/24 | 256 | ARIN | US | 7th Jun 2018 |
| 208.93.208.0/22 | 1k | ARIN | US | 8th Aug 2008 |
| 208.93.36.0/22 | 1k | ARIN | US | 24th Jul 2008 |
| 208.94.120.0/21 | 2k | ARIN | US | 29th Aug 2008 |
| 208.94.156.0/22 | 1k | ARIN | US | 4th Sept 2008 |
| 208.94.168.0/22 | 1k | ARIN |  GP | 8th Sept 2008 |
| 208.94.192.0/22 | 1k | ARIN | US | 8th Sept 2008 |
| 208.94.211.0/24 | 256 | ARIN | US | 20th Nov 2025 |
| 208.94.215.0/24 | 256 | ARIN | US | 26th Jan 2026 |
| 208.94.24.0/22 | 1k | ARIN | US | 21st Aug 2008 |
| 208.95.172.0/22 | 1k | ARIN | CA | 25th Sept 2008 |
| 208.95.208.0/21 | 2k | ARIN | US | 26th Sept 2008 |
| 208.95.32.0/22 | 1k | ARIN | US | 16th Sept 2008 |
| 208.95.40.0/21 | 2k | ARIN | US | 16th Sept 2008 |
| 208.96.184.0/22 | 1k | ARIN | US | 24th Jul 2019 |
| 208.99.128.0/19 | 8.2k | ARIN | CA | 14th Feb 2006 |
| 208.99.24.0/22 | 1k | ARIN | US | 5th Oct 2021 |
| 208.99.32.0/22 | 1k | ARIN | US | 5th Oct 2021 |
| 208.99.4.0/22 | 1k | ARIN | US | 4th Oct 2021 |
| 208.99.44.0/24 | 256 | ARIN | US | 21st Oct 2021 |