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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,346 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 23.160.136.0/24 | 256 | ARIN |  US | 15th Aug 2023 |
| 23.160.188.0/24 | 256 | ARIN | US | 29th Jun 2026 |
| 23.160.196.0/24 | 256 | ARIN |  CA | 29th Jun 2026 |
| 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 |
| 23.160.68.0/24 | 256 | ARIN |  MY | 23rd 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 |
| 23.162.116.0/24 | 256 | ARIN |  PH | 14th Aug 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 |
| 23.162.180.0/24 | 256 | ARIN | CA | 19th 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 |
| 23.162.241.0/24 | 256 | ARIN | CA | 13th Aug 2020 |
| 23.162.248.0/24 | 256 | ARIN | US | 5th Oct 2023 |