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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 the most unannounced blocks, largest first.
Unannounced blocks
85,356 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 206.168.115.0/24 | 256 | ARIN |  US | 14th Nov 2023 |
| 206.168.143.0/24 | 256 | ARIN | US | 5th Jul 2023 |
| 206.168.192.0/24 | 256 | ARIN | US | 4th Apr 2023 |
| 206.168.221.0/24 | 256 | ARIN | US | 3rd Apr 2023 |
| 206.168.240.0/22 | 1k | ARIN | US | 3rd Apr 2023 |
| 206.168.248.0/24 | 256 | ARIN | US | 7th Apr 2023 |
| 206.168.250.0/23 | 512 | ARIN |  PR | 6th Apr 2023 |
| 206.168.4.0/22 | 1k | LACNIC |  CO | 16th Apr 2024 |
| 206.174.224.0/19 | 8.2k | ARIN | US | 10th Nov 2006 |
| 206.175.0.0/16 | 65.5k | ARIN | US | 26th Oct 1995 |
| 206.179.0.0/16 | 65.5k | ARIN |  CA | 30th Oct 1995 |
| 206.183.100.0/22 | 1k | ARIN | US | 20th Nov 2008 |
| 206.183.132.0/22 | 1k | ARIN | CA | 2nd Apr 2024 |
| 206.183.140.0/22 | 1k | ARIN | US | 2nd Apr 2024 |
| 206.183.152.0/24 | 256 | ARIN | US | 2nd Apr 2024 |
| 206.183.155.0/24 | 256 | ARIN | CA | 4th Apr 2024 |
| 206.183.158.0/24 | 256 | ARIN | US | 1st Jul 2026 |
| 206.183.159.0/24 | 256 | ARIN | US | 13th Jan 2026 |
| 206.183.160.0/21 | 2k | ARIN | US | 15th Nov 1995 |
| 206.183.32.0/19 | 8.2k | ARIN | US | 1st Nov 1995 |
| 206.188.203.0/24 | 256 | ARIN | US | 28th Apr 2021 |
| 206.190.128.0/19 | 8.2k | ARIN | US | 21st Dec 1995 |
| 206.190.160.0/19 | 8.2k | ARIN | US | 3rd Jan 1996 |
| 206.190.224.0/22 | 1k | ARIN | US | 17th Jan 1996 |
| 206.190.96.0/19 | 8.2k | ARIN | US | 21st Dec 1995 |
| 206.191.160.0/21 | 2k | ARIN | US | 1st Apr 1997 |
| 206.196.100.0/24 | 256 | ARIN | US | 31st Jul 2026 |
| 206.196.124.0/24 | 256 | ARIN | US | 31st Aug 2026 |
| 206.196.125.0/24 | 256 | ARIN | US | 19th Jul 1995 |
| 206.196.192.0/19 | 8.2k | ARIN | US | 3rd Aug 1995 |
| 206.197.0.0/24 | 256 | ARIN | US | 13th Jun 1995 |
| 206.197.10.0/24 | 256 | ARIN | US | 19th Jun 1995 |
| 206.197.100.0/24 | 256 | ARIN | US | 20th Jul 1995 |
| 206.197.101.0/24 | 256 | ARIN | US | 20th Jul 1995 |
| 206.197.102.0/24 | 256 | ARIN | US | 24th Jul 1995 |
| 206.197.104.0/24 | 256 | ARIN | US | 24th Jul 1995 |
| 206.197.105.0/24 | 256 | ARIN | US | 24th Jul 1995 |
| 206.197.106.0/24 | 256 | ARIN | US | 24th Jul 1995 |
| 206.197.107.0/24 | 256 | ARIN | US | 24th Jul 1995 |
| 206.197.108.0/24 | 256 | ARIN | US | 24th Jul 1995 |
| 206.197.109.0/24 | 256 | ARIN | US | 1st Jul 2026 |
| 206.197.11.0/24 | 256 | ARIN | US | 19th Jun 1995 |
| 206.197.110.0/24 | 256 | ARIN | US | 25th Jul 1995 |
| 206.197.112.0/24 | 256 | ARIN | US | 25th Jul 1995 |
| 206.197.113.0/24 | 256 | ARIN | US | 25th Jul 1995 |
| 206.197.114.0/24 | 256 | ARIN | US | 26th Jul 1995 |
| 206.197.115.0/24 | 256 | ARIN | US | 27th Jul 1995 |
| 206.197.116.0/24 | 256 | ARIN | US | 27th Jul 1995 |
| 206.197.117.0/24 | 256 | ARIN | US | 27th Jul 1995 |
| 206.197.118.0/24 | 256 | ARIN | US | 27th Jul 1995 |