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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in United States
27,014 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 23.160.20.0/24 | 256 | ARIN |  US | 15th Jun 2026 |
| 23.160.200.0/24 | 256 | ARIN | US | 17th Aug 2023 |
| 23.160.201.0/24 | 256 | ARIN | US | 22nd Mar 2024 |
| 23.160.220.0/24 | 256 | ARIN | US | 1st Jul 2026 |
| 23.160.252.0/24 | 256 | ARIN | US | 9th Jul 2026 |
| 23.160.28.0/24 | 256 | ARIN | US | 18th Jun 2026 |
| 23.160.36.0/24 | 256 | ARIN | US | 18th Jun 2026 |
| 23.160.44.0/24 | 256 | ARIN | US | 18th Jun 2026 |
| 23.160.76.0/24 | 256 | ARIN | US | 18th Jun 2026 |
| 23.160.80.0/24 | 256 | ARIN | US | 28th Jan 2026 |
| 23.160.84.0/24 | 256 | ARIN | US | 23rd Jun 2026 |
| 23.161.100.0/24 | 256 | ARIN | US | 17th Jul 2026 |
| 23.161.108.0/24 | 256 | ARIN | US | 17th Jul 2026 |
| 23.161.12.0/24 | 256 | ARIN | US | 9th Jul 2026 |
| 23.161.140.0/24 | 256 | ARIN | US | 21st Jul 2026 |
| 23.161.148.0/24 | 256 | ARIN | US | 21st Jul 2026 |
| 23.161.156.0/24 | 256 | ARIN | US | 22nd Jul 2026 |
| 23.161.188.0/24 | 256 | ARIN | US | 24th Jul 2026 |
| 23.161.204.0/24 | 256 | ARIN | US | 24th Jul 2026 |
| 23.161.208.0/24 | 256 | ARIN | US | 20th Jul 2020 |
| 23.161.212.0/24 | 256 | ARIN | US | 27th Jul 2026 |
| 23.161.220.0/24 | 256 | ARIN | US | 27th Jul 2026 |
| 23.161.33.0/24 | 256 | ARIN | US | 15th Oct 2019 |
| 23.161.34.0/24 | 256 | ARIN | US | 14th Nov 2023 |
| 23.161.4.0/24 | 256 | ARIN | US | 10th Jul 2026 |
| 23.161.44.0/24 | 256 | ARIN | US | 10th Jul 2026 |
| 23.161.56.0/24 | 256 | ARIN | US | 30th Aug 2023 |
| 23.161.68.0/24 | 256 | ARIN | US | 15th Jul 2026 |
| 23.161.76.0/24 | 256 | ARIN | US | 15th Jul 2026 |
| 23.161.84.0/24 | 256 | ARIN | US | 16th Jul 2026 |
| 23.162.12.0/24 | 256 | ARIN | US | 31st Jul 2026 |
| 23.162.124.0/24 | 256 | ARIN | US | 14th Aug 2026 |
| 23.162.128.0/24 | 256 | ARIN | US | 28th Apr 2017 |
| 23.162.148.0/24 | 256 | ARIN | US | 18th Aug 2026 |
| 23.162.156.0/24 | 256 | ARIN | US | 17th Aug 2026 |
| 23.162.192.0/24 | 256 | ARIN | US | 27th Dec 2017 |
| 23.162.196.0/24 | 256 | ARIN | US | 24th Aug 2026 |
| 23.162.20.0/24 | 256 | ARIN | US | 5th Aug 2026 |
| 23.162.204.0/24 | 256 | ARIN | US | 19th Aug 2026 |
| 23.162.212.0/24 | 256 | ARIN | US | 25th Aug 2026 |
| 23.162.220.0/24 | 256 | ARIN | US | 25th Aug 2026 |
| 23.162.228.0/24 | 256 | ARIN | US | 25th Aug 2026 |
| 23.162.248.0/24 | 256 | ARIN | US | 5th Oct 2023 |
| 23.162.36.0/24 | 256 | ARIN | US | 7th Aug 2026 |
| 23.162.4.0/24 | 256 | ARIN | US | 3rd Aug 2026 |
| 23.162.44.0/24 | 256 | ARIN | US | 6th Aug 2026 |
| 23.162.52.0/24 | 256 | ARIN | US | 10th Aug 2026 |
| 23.162.68.0/24 | 256 | ARIN | US | 11th Aug 2026 |
| 23.162.8.0/24 | 256 | ARIN | US | 19th Sept 2023 |
| 23.162.92.0/24 | 256 | ARIN | US | 13th Aug 2026 |