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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 the most unannounced blocks, largest first.
Unannounced blocks in United States
26,963 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 148.95.0.0/16 | 65.5k | ARIN |  US | 12th Apr 1991 |
| 148.96.0.0/16 | 65.5k | ARIN | US | 12th Apr 1991 |
| 148.97.0.0/16 | 65.5k | ARIN | US | 28th Jan 2021 |
| 148.98.0.0/16 | 65.5k | ARIN | US | 12th Apr 1991 |
| 149.103.0.0/16 | 65.5k | ARIN | US | 28th Jan 1992 |
| 149.112.0.0/24 | 256 | ARIN | US | 20th May 2020 |
| 149.112.1.0/24 | 256 | ARIN | US | 3rd Jun 2020 |
| 149.112.101.0/24 | 256 | ARIN | US | 8th May 2024 |
| 149.112.103.0/24 | 256 | ARIN | US | 27th Jun 2024 |
| 149.112.104.0/23 | 512 | ARIN | US | 10th Jun 2024 |
| 149.112.107.0/24 | 256 | ARIN | US | 16th Jul 2024 |
| 149.112.108.0/24 | 256 | ARIN | US | 18th Jul 2024 |
| 149.112.109.0/24 | 256 | ARIN | US | 2nd Aug 2024 |
| 149.112.11.0/24 | 256 | ARIN | US | 14th Oct 2020 |
| 149.112.113.0/24 | 256 | ARIN | US | 3rd Sept 2024 |
| 149.112.114.0/24 | 256 | ARIN | US | 9th Sept 2024 |
| 149.112.117.0/24 | 256 | ARIN | US | 20th Nov 2024 |
| 149.112.118.0/24 | 256 | ARIN | US | 2nd Dec 2024 |
| 149.112.128.0/24 | 256 | ARIN | US | 31st Dec 2024 |
| 149.112.13.0/24 | 256 | ARIN | US | 25th Jan 2021 |
| 149.112.132.0/24 | 256 | ARIN | US | 29th Apr 2025 |
| 149.112.14.0/24 | 256 | ARIN | US | 26th Feb 2021 |
| 149.112.15.0/24 | 256 | ARIN | US | 26th Feb 2021 |
| 149.112.16.0/24 | 256 | ARIN | US | 4th Mar 2021 |
| 149.112.17.0/24 | 256 | ARIN | US | 19th Apr 2021 |
| 149.112.177.0/24 | 256 | ARIN | US | 29th Aug 2025 |
| 149.112.178.0/24 | 256 | ARIN | US | 8th Oct 2025 |
| 149.112.179.0/24 | 256 | ARIN | US | 13th Oct 2025 |
| 149.112.180.0/24 | 256 | ARIN | US | 24th Nov 2025 |
| 149.112.183.0/24 | 256 | ARIN | US | 9th Dec 2025 |
| 149.112.184.0/24 | 256 | ARIN | US | 8th Jan 2026 |
| 149.112.190.0/24 | 256 | ARIN | US | 9th Feb 2026 |
| 149.112.192.0/24 | 256 | ARIN | US | 17th Feb 2026 |
| 149.112.197.0/24 | 256 | ARIN | US | 27th Apr 2026 |
| 149.112.198.0/24 | 256 | ARIN | US | 5th May 2026 |
| 149.112.199.0/24 | 256 | ARIN | US | 5th May 2026 |
| 149.112.2.0/24 | 256 | ARIN | US | 16th Jun 2020 |
| 149.112.200.0/24 | 256 | ARIN | US | 8th Jun 2026 |
| 149.112.201.0/24 | 256 | ARIN | US | 16th Jul 2026 |
| 149.112.202.0/24 | 256 | ARIN | US | 28th Jul 2026 |
| 149.112.21.0/24 | 256 | ARIN | US | 3rd Jun 2021 |
| 149.112.23.0/24 | 256 | ARIN | US | 1st Jul 2021 |
| 149.112.24.0/24 | 256 | ARIN | US | 1st Jul 2021 |
| 149.112.25.0/24 | 256 | ARIN | US | 24th Sept 2021 |
| 149.112.27.0/24 | 256 | ARIN | US | 21st Dec 2021 |
| 149.112.29.0/24 | 256 | ARIN | US | 30th Mar 2022 |
| 149.112.3.0/24 | 256 | ARIN | US | 29th Jun 2020 |
| 149.112.31.0/24 | 256 | ARIN | US | 13th May 2022 |
| 149.112.33.0/24 | 256 | ARIN | US | 9th Jun 2022 |
| 149.112.34.0/24 | 256 | ARIN | US | 9th Jun 2022 |