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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in United States
26,273 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 74.80.194.0/24 | 256 | ARIN |  US | 24th Jul 2023 |
| 74.80.196.0/24 | 256 | ARIN | US | 9th Jun 2023 |
| 74.80.199.0/24 | 256 | ARIN | US | 3rd Oct 2022 |
| 74.80.205.0/24 | 256 | ARIN | US | 20th May 2022 |
| 74.80.209.0/24 | 256 | ARIN | US | 3rd Oct 2024 |
| 74.80.224.0/24 | 256 | ARIN | US | 24th Apr 2023 |
| 74.80.229.0/24 | 256 | ARIN | US | 7th Jul 2022 |
| 74.81.171.0/24 | 256 | ARIN | US | 22nd Feb 2019 |
| 74.81.172.0/24 | 256 | ARIN | US | 22nd Feb 2019 |
| 74.81.78.0/24 | 256 | ARIN | US | 5th Aug 2008 |
| 74.81.85.0/24 | 256 | ARIN | US | 5th Aug 2008 |
| 74.81.87.0/24 | 256 | ARIN | US | 5th Aug 2008 |
| 74.82.224.0/19 | 8.2k | ARIN | US | 3rd Feb 2010 |
| 74.85.153.0/24 | 256 | ARIN | US | 7th Nov 2016 |
| 75.119.160.0/20 | 4.1k | ARIN | US | 5th Mar 2021 |
| 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 |
| 76.164.206.0/23 | 512 | ARIN | US | 27th Sept 2006 |
| 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 |
| 76.76.5.0/24 | 256 | ARIN | US | 4th Nov 2020 |
| 76.76.9.0/24 | 256 | ARIN | US | 22nd Feb 2019 |
| 79.66.0.0/15 | 131k | ARIN | US | 1st Aug 2023 |
| 79.68.0.0/14 | 262k | ARIN | US | 1st Aug 2023 |
| 79.75.0.0/16 | 65.5k | ARIN | US | 1st Aug 2023 |
| 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 |