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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in United States
27,014 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 208.90.248.0/21 | 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 |
| 208.92.124.0/22 | 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 |
| 208.94.192.0/22 | 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 |
| 208.95.208.0/21 | 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 |
| 208.99.24.0/22 | 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 |
| 208.99.50.0/24 | 256 | ARIN | US | 8th Oct 2021 |
| 208.99.55.0/24 | 256 | ARIN | US | 13th Oct 2021 |
| 208.99.60.0/24 | 256 | ARIN | US | 30th Nov 2021 |
| 208.99.61.0/24 | 256 | ARIN | US | 4th Oct 2021 |
| 209.102.0.0/17 | 32.8k | ARIN | US | 9th Jul 1997 |
| 209.103.64.0/18 | 16.4k | ARIN | US | 11th Jul 1997 |
| 209.107.128.0/21 | 2k | ARIN | US | 5th Mar 2019 |
| 209.107.136.0/22 | 1k | ARIN | US | 5th Mar 2019 |
| 209.107.204.0/24 | 256 | ARIN | US | 16th Apr 2009 |
| 209.109.128.0/17 | 32.8k | ARIN | US | 3rd Sept 2003 |
| 209.110.0.0/18 | 16.4k | ARIN | US | 3rd Sept 2003 |
| 209.110.128.0/17 | 32.8k | ARIN | US | 15th Jul 1997 |
| 209.110.96.0/19 | 8.2k | ARIN | US | 15th Jul 1997 |
| 209.113.0.0/17 | 32.8k | ARIN | US | 31st Jul 1997 |
| 209.120.0.0/17 | 32.8k | ARIN | US | 31st Jul 1997 |