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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,968 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 149.112.68.0/24 | 256 | ARIN |  US | 10th May 2023 |
| 149.112.69.0/24 | 256 | ARIN | US | 11th Aug 2025 |
| 149.112.7.0/24 | 256 | ARIN | US | 20th Aug 2020 |
| 149.112.70.0/23 | 512 | ARIN | US | 21st Jul 2023 |
| 149.112.72.0/24 | 256 | ARIN | US | 7th Aug 2023 |
| 149.112.73.0/24 | 256 | ARIN | US | 30th Aug 2023 |
| 149.112.74.0/24 | 256 | ARIN |  CA | 29th Sept 2023 |
| 149.112.75.0/24 | 256 | ARIN | US | 9th Oct 2023 |
| 149.112.76.0/24 | 256 | ARIN | US | 9th Oct 2023 |
| 149.112.8.0/24 | 256 | ARIN | US | 16th Sept 2020 |
| 149.112.80.0/24 | 256 | ARIN | CA | 30th Nov 2023 |
| 149.112.81.0/24 | 256 | ARIN | US | 28th Dec 2023 |
| 149.112.82.0/24 | 256 | ARIN | US | 28th Dec 2023 |
| 149.112.83.0/24 | 256 | ARIN | US | 2nd Jan 2024 |
| 149.112.85.0/24 | 256 | ARIN | US | 8th Feb 2024 |
| 149.112.86.0/23 | 512 | ARIN | US | 15th Feb 2024 |
| 149.112.88.0/24 | 256 | ARIN | US | 27th Feb 2024 |
| 149.112.94.0/24 | 256 | ARIN | US | 19th Apr 2024 |
| 149.112.95.0/24 | 256 | ARIN | US | 22nd Apr 2024 |
| 149.112.96.0/22 | 1k | ARIN | US | 19th Apr 2024 |
| 149.121.0.0/16 | 65.5k | ARIN | US | 26th Nov 1997 |
| 149.122.0.0/16 | 65.5k | ARIN | US | 19th Feb 1993 |
| 149.124.0.0/16 | 65.5k | ARIN | US | 3rd Mar 1993 |
| 149.126.56.0/21 | 2k | RIPE NCC |  BE | 27th Jul 2011 |
| 149.126.64.0/21 | 2k | RIPE NCC |  DE | 27th Jul 2011 |
| 149.131.128.0/20 | 4.1k | ARIN | US | 16th Apr 1991 |
| 149.131.144.0/21 | 2k | ARIN | US | 16th Apr 1991 |
| 149.131.152.0/21 | 2k | ARIN | US | 16th Apr 1991 |
| 149.131.160.0/19 | 8.2k | ARIN | US | 16th Apr 1991 |
| 149.131.192.0/18 | 16.4k | ARIN | US | 16th Apr 1991 |
| 149.137.208.0/22 | 1k | ARIN | US | 6th Apr 2020 |
| 149.141.0.0/16 | 65.5k | ARIN | US | 24th Apr 1991 |
| 149.145.0.0/16 | 65.5k | ARIN | US | 26th Apr 1991 |
| 149.154.184.0/22 | 1k | RIPE NCC |  MD | 10th Aug 2011 |
| 149.170.144.0/24 | 256 | RIPE NCC | DE | 9th May 1991 |
| 149.170.145.0/24 | 256 | RIPE NCC |  GR | 9th May 1991 |
| 149.170.146.0/24 | 256 | RIPE NCC |  SC | 9th May 1991 |
| 149.170.147.0/24 | 256 | RIPE NCC |  GB | 9th May 1991 |
| 149.170.148.0/22 | 1k | RIPE NCC | GB | 9th May 1991 |
| 149.170.152.0/21 | 2k | RIPE NCC | GB | 9th May 1991 |
| 149.170.58.0/24 | 256 | RIPE NCC |  SI | 9th May 1991 |
| 149.170.59.0/24 | 256 | RIPE NCC |  IE | 9th May 1991 |
| 149.178.0.0/15 | 131k | RIPE NCC | GB | 13th May 1991 |
| 149.180.128.0/17 | 32.8k | RIPE NCC | GB | 13th May 1991 |
| 149.181.128.0/17 | 32.8k | RIPE NCC | GB | 13th May 1991 |
| 149.182.0.0/15 | 131k | RIPE NCC | GB | 13th May 1991 |
| 149.184.0.0/15 | 131k | RIPE NCC | GB | 13th May 1991 |
| 149.187.0.0/17 | 32.8k | RIPE NCC | GB | 13th May 1991 |
| 149.189.0.0/16 | 65.5k | RIPE NCC | GB | 13th May 1991 |
| 149.19.128.0/20 | 4.1k | RIPE NCC | DE | 1st Jun 1993 |