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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,201 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.234.224.0/24 | 256 | ARIN |  CA | 5th Nov 1992 |
| 192.234.225.0/24 | 256 | ARIN | CA | 5th Nov 1992 |
| 192.234.228.0/24 | 256 | ARIN | CA | 5th Nov 1992 |
| 192.234.230.0/24 | 256 | ARIN |  US | 9th Nov 1992 |
| 192.234.232.0/24 | 256 | ARIN | US | 9th Nov 1992 |
| 192.234.233.0/24 | 256 | ARIN | US | 9th Nov 1992 |
| 192.234.236.0/24 | 256 | ARIN | US | 10th Nov 1992 |
| 192.234.237.0/24 | 256 | ARIN | US | 10th Nov 1992 |
| 192.234.238.0/24 | 256 | ARIN | US | 10th Nov 1992 |
| 192.234.239.0/24 | 256 | ARIN | US | 10th Nov 1992 |
| 192.234.24.0/24 | 256 | ARIN | US | 30th Sept 1992 |
| 192.234.240.0/24 | 256 | ARIN | US | 10th Nov 1992 |
| 192.234.242.0/24 | 256 | ARIN | US | 10th Nov 1992 |
| 192.234.243.0/24 | 256 | ARIN | US | 10th Nov 1992 |
| 192.234.244.0/24 | 256 | ARIN | US | 10th Nov 1992 |
| 192.234.246.0/24 | 256 | ARIN | US | 9th Nov 1992 |
| 192.234.248.0/24 | 256 | ARIN | US | 9th Nov 1992 |
| 192.234.25.0/24 | 256 | ARIN | US | 30th Sept 1992 |
| 192.234.250.0/24 | 256 | ARIN | US | 9th Nov 1992 |
| 192.234.251.0/24 | 256 | ARIN | US | 9th Nov 1992 |
| 192.234.252.0/24 | 256 | ARIN | US | 9th Nov 1992 |
| 192.234.26.0/24 | 256 | ARIN | US | 30th Sept 1992 |
| 192.234.27.0/24 | 256 | ARIN | US | 30th Sept 1992 |
| 192.234.28.0/24 | 256 | ARIN | US | 30th Sept 1992 |
| 192.234.29.0/24 | 256 | ARIN | US | 30th Sept 1992 |
| 192.234.30.0/24 | 256 | ARIN | US | 30th Sept 1992 |
| 192.234.31.0/24 | 256 | ARIN | US | 5th Jul 2023 |
| 192.234.35.0/24 | 256 | ARIN | US | 1st Oct 1992 |
| 192.234.43.0/24 | 256 | ARIN | US | 6th Oct 1992 |
| 192.234.44.0/24 | 256 | ARIN | US | 6th Oct 1992 |
| 192.234.45.0/24 | 256 | ARIN | US | 6th Oct 1992 |
| 192.234.46.0/24 | 256 | ARIN | US | 6th Oct 1992 |
| 192.234.47.0/24 | 256 | ARIN | US | 6th Oct 1992 |
| 192.234.48.0/24 | 256 | ARIN | US | 6th Oct 1992 |
| 192.234.49.0/24 | 256 | ARIN | US | 6th Oct 1992 |
| 192.234.51.0/24 | 256 | ARIN | US | 6th Oct 1992 |
| 192.234.52.0/24 | 256 | ARIN | US | 6th Oct 1992 |
| 192.234.53.0/24 | 256 | ARIN | US | 6th Oct 1992 |
| 192.234.54.0/24 | 256 | ARIN | US | 6th Oct 1992 |
| 192.234.55.0/24 | 256 | ARIN | US | 6th Oct 1992 |
| 192.234.57.0/24 | 256 | ARIN | US | 6th Oct 1992 |
| 192.234.59.0/24 | 256 | ARIN | US | 6th Oct 1992 |
| 192.234.6.0/24 | 256 | ARIN | US | 28th Sept 1992 |
| 192.234.60.0/24 | 256 | ARIN | US | 6th Oct 1992 |
| 192.234.61.0/24 | 256 | ARIN | US | 6th Oct 1992 |
| 192.234.62.0/24 | 256 | ARIN | US | 6th Oct 1992 |
| 192.234.63.0/24 | 256 | ARIN | US | 6th Oct 1992 |
| 192.234.64.0/24 | 256 | ARIN | US | 26th Oct 1992 |
| 192.234.65.0/24 | 256 | ARIN | US | 6th Oct 1992 |
| 192.234.66.0/24 | 256 | ARIN | US | 6th Oct 1992 |