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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,124 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.124.99.0/24 | 256 | ARIN |  US | 16th Sept 1991 |
| 192.126.2.0/23 | 512 | RIPE NCC |  FI | 17th Sept 1991 |
| 192.126.4.0/22 | 1k | RIPE NCC | FI | 17th Sept 1991 |
| 192.126.65.0/24 | 256 | ARIN | US | 25th Sept 1991 |
| 192.126.66.0/24 | 256 | ARIN | US | 25th Sept 1991 |
| 192.126.8.0/21 | 2k | RIPE NCC | FI | 17th Sept 1991 |
| 192.128.0.0/16 | 65.5k | ARIN | US | 23rd Sept 1991 |
| 192.129.100.0/24 | 256 | ARIN | US | 30th Sept 1991 |
| 192.129.101.0/24 | 256 | ARIN | US | 30th Sept 1991 |
| 192.129.102.0/24 | 256 | ARIN | US | 30th Sept 1991 |
| 192.129.103.0/24 | 256 | ARIN | US | 30th Sept 1991 |
| 192.129.104.0/24 | 256 | ARIN | US | 30th Sept 1991 |
| 192.129.105.0/24 | 256 | ARIN | US | 30th Sept 1991 |
| 192.129.106.0/24 | 256 | ARIN | US | 30th Sept 1991 |
| 192.129.107.0/24 | 256 | ARIN | US | 30th Sept 1991 |
| 192.129.108.0/24 | 256 | ARIN | US | 30th Sept 1991 |
| 192.129.109.0/24 | 256 | ARIN | US | 30th Sept 1991 |
| 192.129.110.0/24 | 256 | ARIN | US | 30th Sept 1991 |
| 192.129.19.0/24 | 256 | RIPE NCC |  DE | 1st May 1991 |
| 192.129.20.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.129.21.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.129.22.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.129.34.0/24 | 256 | RIPE NCC | DE | 15th Jun 1992 |
| 192.129.35.0/24 | 256 | RIPE NCC | DE | 15th Jun 1992 |
| 192.129.37.0/24 | 256 | RIPE NCC | DE | 15th Jun 1992 |
| 192.129.38.0/24 | 256 | RIPE NCC | DE | 15th Jun 1992 |
| 192.129.39.0/24 | 256 | RIPE NCC | DE | 15th Jun 1992 |
| 192.129.40.0/24 | 256 | RIPE NCC | DE | 15th Jun 1992 |
| 192.129.41.0/24 | 256 | RIPE NCC | DE | 15th Jun 1992 |
| 192.129.42.0/24 | 256 | RIPE NCC | DE | 15th Jun 1992 |
| 192.129.50.0/24 | 256 | RIPE NCC | DE | 15th Jun 1992 |
| 192.129.52.0/24 | 256 | RIPE NCC | DE | 15th Jun 1992 |
| 192.129.53.0/24 | 256 | RIPE NCC | DE | 15th Jun 1992 |
| 192.129.58.0/24 | 256 | RIPE NCC | DE | 15th Jun 1992 |
| 192.129.59.0/24 | 256 | RIPE NCC | DE | 15th Jun 1992 |
| 192.129.6.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.129.60.0/24 | 256 | RIPE NCC | DE | 15th Jun 1992 |
| 192.129.61.0/24 | 256 | RIPE NCC | DE | 15th Jun 1992 |
| 192.129.71.0/24 | 256 | ARIN | US | 24th Sept 1991 |
| 192.129.72.0/23 | 512 | ARIN | US | 24th Sept 1991 |
| 192.129.74.0/24 | 256 | ARIN | US | 24th Sept 1991 |
| 192.129.75.0/24 | 256 | ARIN | US | 24th Sept 1991 |
| 192.129.77.0/24 | 256 | ARIN | US | 24th Sept 1991 |
| 192.129.79.0/24 | 256 | ARIN | US | 24th Sept 1991 |
| 192.129.80.0/24 | 256 | RIPE NCC |  AT | 24th Sept 1991 |
| 192.129.81.0/24 | 256 | ARIN | US | 24th Sept 1991 |
| 192.129.82.0/24 | 256 | ARIN | US | 24th Sept 1991 |
| 192.129.83.0/24 | 256 | ARIN | US | 24th Sept 1991 |
| 192.129.84.0/24 | 256 | RIPE NCC |  GB | 24th Sept 1991 |
| 192.129.86.0/24 | 256 | ARIN | US | 24th Sept 1991 |