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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
Browse by country
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 |
|---|---|---|---|---|
| 208.79.96.0/22 | 1k | ARIN |  GP | 15th Jun 2007 |
| 208.80.108.0/22 | 1k | ARIN |  US | 18th Jul 2007 |
| 208.80.112.0/22 | 1k | ARIN | US | 6th Apr 2026 |
| 208.80.48.0/22 | 1k | ARIN | US | 10th Jul 2007 |
| 208.80.56.0/22 | 1k | ARIN | US | 10th Jul 2007 |
| 208.80.92.0/22 | 1k | ARIN | US | 27th Mar 2020 |
| 208.81.124.0/22 | 1k | ARIN | US | 17th Aug 2007 |
| 208.81.144.0/22 | 1k | ARIN |  CA | 17th Aug 2007 |
| 208.81.184.0/23 | 512 | ARIN | US | 22nd Aug 2007 |
| 208.81.186.0/23 | 512 | ARIN | CA | 27th Oct 2022 |
| 208.81.208.0/24 | 256 | ARIN | US | 6th Aug 2018 |
| 208.81.210.0/23 | 512 | ARIN | US | 27th Aug 2007 |
| 208.81.232.0/24 | 256 | ARIN | US | 30th Aug 2007 |
| 208.81.233.0/24 | 256 | ARIN | US | 30th Aug 2007 |
| 208.81.234.0/23 | 512 | ARIN | US | 30th Aug 2007 |
| 208.81.240.0/21 | 2k | ARIN | US | 7th Jun 2019 |
| 208.82.172.0/22 | 1k | ARIN | US | 9th Nov 2020 |
| 208.82.176.0/22 | 1k | ARIN | US | 21st Sept 2007 |
| 208.82.32.0/22 | 1k | ARIN | US | 10th Sept 2007 |
| 208.82.4.0/22 | 1k | ARIN | US | 6th Sept 2007 |
| 208.82.80.0/22 | 1k | ARIN | US | 13th Sept 2007 |
| 208.83.110.0/24 | 256 | ARIN | US | 29th Apr 2025 |
| 208.83.209.0/24 | 256 | ARIN | CA | 18th Oct 2007 |
| 208.83.210.0/23 | 512 | ARIN | CA | 18th Oct 2007 |
| 208.83.213.0/24 | 256 | ARIN | CA | 18th Oct 2007 |
| 208.83.214.0/23 | 512 | ARIN | CA | 18th Oct 2007 |
| 208.83.32.0/22 | 1k | ARIN | US | 23rd Apr 2026 |
| 208.83.52.0/22 | 1k | ARIN | US | 1st Jul 2025 |
| 208.84.140.0/22 | 1k | ARIN | US | 15th Nov 2007 |
| 208.84.176.0/22 | 1k | ARIN | US | 20th Nov 2007 |
| 208.84.220.0/22 | 1k | ARIN | US | 28th Nov 2007 |
| 208.84.240.0/21 | 2k | ARIN | US | 30th Nov 2007 |
| 208.84.28.0/22 | 1k | ARIN | US | 30th Oct 2007 |
| 208.84.36.0/22 | 1k | ARIN | CA | 17th Dec 2019 |
| 208.85.108.0/22 | 1k | ARIN | US | 13th Dec 2007 |
| 208.85.144.0/21 | 2k | ARIN | US | 19th Dec 2007 |
| 208.85.152.0/22 | 1k | ARIN | US | 19th Dec 2007 |
| 208.85.56.0/22 | 1k | ARIN | US | 3rd Dec 2007 |
| 208.85.84.0/22 | 1k | ARIN | CA | 6th Dec 2007 |
| 208.86.128.0/21 | 2k | ARIN | US | 22nd Jan 2008 |
| 208.86.184.0/21 | 2k | ARIN | US | 28th Jan 2008 |
| 208.86.206.0/23 | 512 | ARIN | CA | 31st Jan 2008 |
| 208.86.72.0/21 | 2k | ARIN | US | 14th Jan 2008 |
| 208.87.172.0/22 | 1k | ARIN | US | 26th Feb 2008 |
| 208.87.184.0/21 | 2k | ARIN | US | 26th Feb 2008 |
| 208.87.208.0/21 | 2k | ARIN | US | 27th Feb 2008 |
| 208.87.8.0/22 | 1k | ARIN | US | 11th Feb 2008 |
| 208.88.144.0/22 | 1k | ARIN | US | 18th Mar 2008 |
| 208.88.184.0/21 | 2k | ARIN | CA | 24th Mar 2008 |
| 208.88.204.0/22 | 1k | ARIN | US | 26th Mar 2008 |