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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,248 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.179.186.0/24 | 256 | ARIN |  US | 27th Oct 1993 |
| 198.179.187.0/24 | 256 | ARIN | US | 28th Oct 1993 |
| 198.179.188.0/24 | 256 | ARIN | US | 28th Oct 1993 |
| 198.179.19.0/24 | 256 | ARIN | US | 28th Jun 1993 |
| 198.179.190.0/24 | 256 | ARIN | US | 28th Oct 1993 |
| 198.179.191.0/24 | 256 | ARIN | US | 28th Oct 1993 |
| 198.179.193.0/24 | 256 | ARIN | US | 28th Oct 1993 |
| 198.179.194.0/24 | 256 | ARIN | US | 28th Oct 1993 |
| 198.179.195.0/24 | 256 | ARIN | US | 28th Oct 1993 |
| 198.179.196.0/24 | 256 | ARIN | US | 30th Jul 2019 |
| 198.179.197.0/24 | 256 | ARIN | US | 28th Oct 1993 |
| 198.179.198.0/24 | 256 | ARIN | US | 31st Oct 2024 |
| 198.179.199.0/24 | 256 | ARIN | US | 1st Nov 1993 |
| 198.179.20.0/24 | 256 | ARIN | US | 28th Jun 1993 |
| 198.179.200.0/24 | 256 | ARIN | US | 1st Nov 1993 |
| 198.179.201.0/24 | 256 | ARIN | US | 1st Nov 1993 |
| 198.179.202.0/24 | 256 | ARIN | US | 1st Nov 1993 |
| 198.179.203.0/24 | 256 | ARIN | US | 1st Nov 1993 |
| 198.179.204.0/24 | 256 | ARIN | US | 1st Nov 1993 |
| 198.179.205.0/24 | 256 | ARIN | US | 1st Nov 1993 |
| 198.179.206.0/23 | 512 | ARIN | US | 1st Nov 1993 |
| 198.179.208.0/24 | 256 | ARIN | US | 1st Nov 1993 |
| 198.179.209.0/24 | 256 | ARIN | US | 2nd Nov 1993 |
| 198.179.21.0/24 | 256 | ARIN | US | 28th Jun 1993 |
| 198.179.210.0/24 | 256 | ARIN | US | 2nd Nov 1993 |
| 198.179.211.0/24 | 256 | ARIN | US | 2nd Nov 1993 |
| 198.179.212.0/24 | 256 | ARIN | US | 3rd Nov 1993 |
| 198.179.213.0/24 | 256 | ARIN | US | 3rd Nov 1993 |
| 198.179.215.0/24 | 256 | ARIN | US | 4th Nov 1993 |
| 198.179.216.0/23 | 512 | ARIN | US | 4th Nov 1993 |
| 198.179.218.0/24 | 256 | ARIN | US | 4th Nov 1993 |
| 198.179.22.0/24 | 256 | ARIN | US | 28th Jun 1993 |
| 198.179.222.0/23 | 512 | ARIN | US | 4th Nov 1993 |
| 198.179.224.0/24 | 256 | ARIN | US | 1st Jul 2026 |
| 198.179.23.0/24 | 256 | ARIN | US | 28th Jun 1993 |
| 198.179.230.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.179.231.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.179.233.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.179.235.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.179.236.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.179.238.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.179.239.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.179.24.0/24 | 256 | ARIN | US | 25th May 1993 |
| 198.179.240.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.179.241.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.179.242.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.179.245.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.179.246.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.179.247.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.179.25.0/24 | 256 | ARIN | US | 28th Jun 1993 |