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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through ARIN, largest first.
Unannounced blocks in United States
26,251 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 75.127.111.0/24 | 256 | ARIN |  US | 18th Jun 2007 |
| 75.127.113.0/24 | 256 | ARIN | US | 18th Jun 2007 |
| 75.127.119.0/24 | 256 | ARIN | US | 18th Jun 2007 |
| 75.127.71.0/24 | 256 | ARIN | US | 18th Jun 2007 |
| 75.127.72.0/24 | 256 | ARIN | US | 26th Nov 2018 |
| 75.127.76.0/24 | 256 | ARIN | US | 18th Jun 2007 |
| 75.127.77.0/24 | 256 | ARIN | US | 26th Nov 2018 |
| 75.127.78.0/23 | 512 | ARIN | US | 18th Jun 2007 |
| 75.127.91.0/24 | 256 | ARIN | US | 18th Jun 2007 |
| 75.127.93.0/24 | 256 | ARIN | US | 18th Jun 2007 |
| 75.127.96.0/23 | 512 | ARIN | US | 26th Nov 2018 |
| 75.127.98.0/23 | 512 | ARIN | US | 18th Jun 2007 |
| 75.76.160.0/24 | 256 | ARIN | US | 13th Feb 2008 |
| 75.76.175.0/24 | 256 | ARIN | US | 13th Feb 2008 |
| 75.79.0.0/16 | 65.5k | ARIN | US | 20th Dec 2018 |
| 76.164.230.0/24 | 256 | ARIN | US | 20th Sept 2019 |
| 76.164.231.0/24 | 256 | ARIN | US | 1st Jul 2021 |
| 76.188.0.0/15 | 131k | ARIN | US | 26th Jul 2006 |
| 76.191.0.0/20 | 4.1k | ARIN | US | 12th Dec 2007 |
| 76.75.192.0/20 | 4.1k | ARIN | US | 21st May 2024 |
| 76.75.208.0/20 | 4.1k | ARIN | US | 3rd May 2007 |
| 76.76.11.0/24 | 256 | ARIN | US | 6th Oct 2020 |
| 76.76.24.0/24 | 256 | ARIN | US | 9th Feb 2021 |
| 76.76.29.0/24 | 256 | ARIN | US | 24th Jun 2019 |
| 76.76.5.0/24 | 256 | ARIN | US | 4th Nov 2020 |
| 76.76.9.0/24 | 256 | ARIN | US | 22nd Feb 2019 |
| 80.44.0.0/16 | 65.5k | ARIN | US | 12th Oct 2026 |
| 80.46.160.0/19 | 8.2k | ARIN | US | 21st Sept 2026 |
| 80.47.240.0/20 | 4.1k | ARIN | US | 9th Sept 2026 |
| 80.73.134.0/24 | 256 | ARIN | US | 15th Feb 2024 |
| 81.199.144.0/23 | 512 | ARIN | US | 13th Jan 2022 |
| 81.199.36.0/22 | 1k | ARIN | US | 13th Jan 2022 |
| 81.92.244.0/22 | 1k | ARIN | US | 4th Apr 2022 |
| 83.151.208.0/20 | 4.1k | ARIN | US | 18th Jun 2024 |
| 87.120.48.0/21 | 2k | ARIN | US | 22nd May 2024 |
| 88.104.0.0/13 | 524k | ARIN | US | 20th Dec 2023 |
| 89.41.224.0/20 | 4.1k | ARIN | US | 21st Jun 2021 |
| 89.48.0.0/13 | 524k | ARIN | US | 4th Dec 2024 |
| 9.0.0.0/13 | 524k | ARIN | US | 16th Dec 1988 |
| 9.10.0.0/15 | 131k | ARIN | US | 16th Dec 1988 |
| 9.12.0.0/14 | 262k | ARIN | US | 16th Dec 1988 |
| 9.147.0.0/16 | 65.5k | ARIN | US | 16th Dec 1988 |
| 9.150.0.0/16 | 65.5k | ARIN | US | 16th Dec 1988 |
| 9.16.0.0/12 | 1M | ARIN | US | 16th Dec 1988 |
| 9.172.0.0/16 | 65.5k | ARIN | US | 16th Dec 1988 |
| 9.180.0.0/14 | 262k | ARIN | US | 16th Dec 1988 |
| 9.184.0.0/16 | 65.5k | ARIN | US | 16th Dec 1988 |
| 9.186.0.0/16 | 65.5k | ARIN | US | 16th Dec 1988 |
| 9.189.0.0/16 | 65.5k | ARIN | US | 16th Dec 1988 |
| 9.194.0.0/16 | 65.5k | ARIN | US | 16th Dec 1988 |