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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,279 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.206.179.0/24 | 256 | ARIN |  US | 27th Oct 1993 |
| 198.206.189.0/24 | 256 | ARIN | US | 27th Oct 1993 |
| 198.206.190.0/24 | 256 | ARIN | US | 27th Oct 1993 |
| 198.206.192.0/24 | 256 | ARIN | US | 27th Oct 1993 |
| 198.206.195.0/24 | 256 | ARIN | US | 28th Oct 1993 |
| 198.206.196.0/24 | 256 | ARIN | US | 28th Oct 1993 |
| 198.206.197.0/24 | 256 | RIPE NCC |  CH | 1st Sept 1993 |
| 198.206.198.0/23 | 512 | ARIN | US | 28th Oct 1993 |
| 198.206.200.0/23 | 512 | RIPE NCC | CH | 1st Sept 1993 |
| 198.206.202.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 198.206.203.0/24 | 256 | ARIN | US | 28th Oct 1993 |
| 198.206.205.0/24 | 256 | ARIN | US | 28th Oct 1993 |
| 198.206.206.0/23 | 512 | ARIN | US | 28th Oct 1993 |
| 198.206.208.0/24 | 256 | ARIN | US | 28th Oct 1993 |
| 198.206.209.0/24 | 256 | ARIN | US | 28th Oct 1993 |
| 198.206.210.0/23 | 512 | ARIN | US | 29th Oct 1993 |
| 198.206.212.0/23 | 512 | ARIN | US | 29th Oct 1993 |
| 198.206.214.0/24 | 256 | ARIN | US | 29th Oct 1993 |
| 198.206.215.0/24 | 256 | ARIN | US | 30th Oct 1993 |
| 198.206.216.0/24 | 256 | ARIN | US | 30th Oct 1993 |
| 198.206.217.0/24 | 256 | ARIN | US | 30th Oct 1993 |
| 198.206.218.0/24 | 256 | ARIN | US | 30th Oct 1993 |
| 198.206.220.0/24 | 256 | ARIN | US | 30th Oct 1993 |
| 198.206.225.0/24 | 256 | ARIN | US | 1st Nov 1993 |
| 198.206.227.0/24 | 256 | ARIN | US | 1st Nov 1993 |
| 198.206.230.0/23 | 512 | ARIN | US | 1st Nov 1993 |
| 198.206.232.0/23 | 512 | ARIN | US | 1st Nov 1993 |
| 198.206.234.0/23 | 512 | ARIN | US | 1st Nov 1993 |
| 198.206.236.0/24 | 256 | ARIN | US | 1st Nov 1993 |
| 198.206.244.0/24 | 256 | ARIN | US | 1st Nov 1993 |
| 198.206.245.0/24 | 256 | ARIN |  CA | 3rd Jan 2018 |
| 198.206.247.0/24 | 256 | ARIN | US | 1st Nov 1993 |
| 198.206.252.0/24 | 256 | ARIN | US | 2nd Nov 1993 |
| 198.206.253.0/24 | 256 | ARIN | US | 2nd Nov 1993 |
| 198.206.254.0/24 | 256 | ARIN | US | 2nd Nov 1993 |
| 198.206.64.0/18 | 16.4k | ARIN | US | 12th Oct 1993 |
| 198.207.0.0/21 | 2k | ARIN | US | 12th Jul 1993 |
| 198.207.12.0/22 | 1k | ARIN | US | 30th Dec 2020 |
| 198.207.128.0/24 | 256 | ARIN | US | 2nd Nov 1993 |
| 198.207.130.0/23 | 512 | ARIN | US | 2nd Nov 1993 |
| 198.207.132.0/22 | 1k | ARIN | US | 2nd Nov 1993 |
| 198.207.137.0/24 | 256 | ARIN | US | 2nd Nov 1993 |
| 198.207.138.0/23 | 512 | ARIN | US | 2nd Nov 1993 |
| 198.207.141.0/24 | 256 | ARIN | US | 3rd Nov 1993 |
| 198.207.142.0/23 | 512 | ARIN | US | 3rd Nov 1993 |
| 198.207.144.0/24 | 256 | ARIN | US | 3rd Nov 1993 |
| 198.207.153.0/24 | 256 | ARIN | US | 3rd Nov 1993 |
| 198.207.156.0/24 | 256 | ARIN | US | 3rd Nov 1993 |
| 198.207.158.0/24 | 256 | ARIN | US | 3rd Nov 1993 |
| 198.207.159.0/24 | 256 | ARIN | US | 3rd Nov 1993 |