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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.245.228.0/24 | 256 | ARIN |  CA | 27th Nov 1992 |
| 192.245.229.0/24 | 256 | ARIN |  US | 27th Nov 1992 |
| 192.245.232.0/24 | 256 | ARIN | US | 27th Nov 1992 |
| 192.245.233.0/24 | 256 | ARIN | US | 27th Nov 1992 |
| 192.245.234.0/24 | 256 | ARIN | US | 27th Nov 1992 |
| 192.245.235.0/24 | 256 | ARIN | US | 22nd Apr 1997 |
| 192.245.236.0/24 | 256 | ARIN | US | 27th Nov 1992 |
| 192.245.238.0/24 | 256 | ARIN | US | 27th Nov 1992 |
| 192.245.239.0/24 | 256 | ARIN | US | 27th Nov 1992 |
| 192.245.24.0/24 | 256 | ARIN | CA | 27th Oct 1992 |
| 192.245.240.0/22 | 1k | ARIN | US | 27th Nov 1992 |
| 192.245.244.0/22 | 1k | ARIN | US | 27th Nov 1992 |
| 192.245.248.0/24 | 256 | ARIN | US | 27th Nov 1992 |
| 192.245.253.0/24 | 256 | ARIN | US | 27th Nov 1992 |
| 192.245.3.0/24 | 256 | ARIN | US | 26th Oct 1992 |
| 192.245.31.0/24 | 256 | ARIN | US | 27th Oct 1992 |
| 192.245.32.0/24 | 256 | ARIN | US | 27th Oct 1992 |
| 192.245.33.0/24 | 256 | ARIN | US | 27th Oct 1992 |
| 192.245.37.0/24 | 256 | ARIN | US | 30th Oct 1992 |
| 192.245.38.0/24 | 256 | ARIN | US | 30th Oct 1992 |
| 192.245.39.0/24 | 256 | ARIN | US | 30th Oct 1992 |
| 192.245.4.0/24 | 256 | ARIN | US | 26th Oct 1992 |
| 192.245.40.0/24 | 256 | ARIN | US | 30th Oct 1992 |
| 192.245.41.0/24 | 256 | ARIN | US | 30th Oct 1992 |
| 192.245.45.0/24 | 256 | ARIN | US | 30th Oct 1992 |
| 192.245.46.0/23 | 512 | ARIN | US | 30th Oct 1992 |
| 192.245.48.0/23 | 512 | ARIN | US | 30th Oct 1992 |
| 192.245.5.0/24 | 256 | ARIN | US | 26th Oct 1992 |
| 192.245.52.0/24 | 256 | ARIN | US | 30th Oct 1992 |
| 192.245.53.0/24 | 256 | ARIN | US | 30th Oct 1992 |
| 192.245.54.0/23 | 512 | ARIN | US | 30th Oct 1992 |
| 192.245.56.0/24 | 256 | ARIN | US | 30th Oct 1992 |
| 192.245.58.0/23 | 512 | APNIC |  SG | 30th Oct 1992 |
| 192.245.62.0/24 | 256 | ARIN | US | 30th Oct 1992 |
| 192.245.63.0/24 | 256 | ARIN | US | 30th Oct 1992 |
| 192.245.65.0/24 | 256 | ARIN | US | 2nd Nov 1992 |
| 192.245.81.0/24 | 256 | ARIN | US | 2nd Nov 1992 |
| 192.245.82.0/23 | 512 | ARIN | US | 2nd Nov 1992 |
| 192.245.84.0/23 | 512 | ARIN | US | 2nd Nov 1992 |
| 192.245.90.0/24 | 256 | ARIN | US | 2nd Nov 1992 |
| 192.245.92.0/24 | 256 | ARIN | US | 2nd Nov 1992 |
| 192.245.93.0/24 | 256 | ARIN | US | 2nd Nov 1992 |
| 192.245.95.0/24 | 256 | ARIN | US | 2nd Nov 1992 |
| 192.245.96.0/24 | 256 | ARIN | US | 2nd Nov 1992 |
| 192.245.97.0/24 | 256 | RIPE NCC |  SE | 2nd Nov 1992 |
| 192.245.99.0/24 | 256 | ARIN | US | 2nd Nov 1992 |
| 192.247.1.0/24 | 256 | RIPE NCC |  GB | 26th Oct 1992 |
| 192.247.10.0/24 | 256 | RIPE NCC | GB | 26th Oct 1992 |
| 192.247.11.0/24 | 256 | ARIN | US | 14th Nov 2017 |
| 192.247.2.0/23 | 512 | RIPE NCC | GB | 26th Oct 1992 |