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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,221 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.82.240.0/24 | 256 | ARIN |  US | 26th Mar 1990 |
| 192.83.101.0/24 | 256 | ARIN |  CA | 7th Sept 1990 |
| 192.83.102.0/24 | 256 | RIPE NCC |  GB | 7th Sept 1990 |
| 192.83.103.0/24 | 256 | ARIN | US | 9th Jan 2015 |
| 192.83.105.0/24 | 256 | ARIN | US | 7th Sept 1990 |
| 192.83.106.0/24 | 256 | ARIN | US | 7th Sept 1990 |
| 192.83.108.0/24 | 256 | ARIN | US | 7th Sept 1990 |
| 192.83.109.0/24 | 256 | ARIN | US | 7th Sept 1990 |
| 192.83.115.0/24 | 256 | ARIN | US | 17th Sept 1990 |
| 192.83.116.0/24 | 256 | ARIN | US | 17th Sept 1990 |
| 192.83.117.0/24 | 256 | ARIN | US | 17th Sept 1990 |
| 192.83.118.0/24 | 256 | APNIC |  AU | 17th Sept 1990 |
| 192.83.121.0/24 | 256 | ARIN | CA | 17th Sept 1990 |
| 192.83.158.0/24 | 256 | ARIN | US | 17th Sept 1990 |
| 192.83.159.0/24 | 256 | ARIN | US | 17th Sept 1990 |
| 192.83.162.0/24 | 256 | ARIN | US | 17th Sept 1990 |
| 192.83.163.0/24 | 256 | ARIN | US | 17th Sept 1990 |
| 192.83.197.0/24 | 256 | ARIN | US | 19th Sept 1990 |
| 192.83.198.0/24 | 256 | APNIC | AU | 19th Sept 1990 |
| 192.83.200.0/24 | 256 | RIPE NCC | GB | 1st Apr 2005 |
| 192.83.202.0/24 | 256 | RIPE NCC | GB | 19th Sept 1990 |
| 192.83.204.0/24 | 256 | ARIN | US | 19th Sept 1990 |
| 192.83.206.0/24 | 256 | ARIN | US | 19th Sept 1990 |
| 192.83.216.0/24 | 256 | RIPE NCC | US | 12th Nov 2019 |
| 192.83.222.0/24 | 256 | ARIN | US | 19th Jun 2015 |
| 192.83.224.0/24 | 256 | APNIC | AU | 26th Sept 1990 |
| 192.83.225.0/24 | 256 | ARIN | US | 5th Dec 1990 |
| 192.83.226.0/24 | 256 | ARIN | US | 1st Oct 1990 |
| 192.83.227.0/24 | 256 | ARIN | US | 1st Oct 1990 |
| 192.83.229.0/24 | 256 | RIPE NCC |  DE | 1st Oct 1990 |
| 192.83.233.0/24 | 256 | ARIN | US | 1st Oct 1990 |
| 192.83.234.0/24 | 256 | ARIN | US | 1st Oct 1990 |
| 192.83.235.0/24 | 256 | ARIN | US | 1st Oct 1990 |
| 192.83.236.0/24 | 256 | ARIN | US | 1st Oct 1990 |
| 192.83.239.0/24 | 256 | ARIN | US | 30th Jun 1990 |
| 192.83.240.0/24 | 256 | ARIN | US | 30th Jun 1990 |
| 192.83.241.0/24 | 256 | ARIN | US | 30th Jun 1990 |
| 192.83.244.0/24 | 256 | ARIN | US | 8th Oct 1990 |
| 192.83.246.0/24 | 256 | ARIN | US | 8th Oct 1990 |
| 192.83.247.0/24 | 256 | ARIN | CA | 8th Oct 1990 |
| 192.83.250.0/24 | 256 | ARIN | US | 8th Oct 1990 |
| 192.84.102.0/24 | 256 | RIPE NCC |  SI | 26th Oct 1990 |
| 192.84.103.0/24 | 256 | RIPE NCC | SI | 26th Oct 1990 |
| 192.84.108.0/24 | 256 | RIPE NCC |  HR | 26th Oct 1990 |
| 192.84.11.0/24 | 256 | ARIN | US | 30th Jun 1990 |
| 192.84.111.0/24 | 256 | ARIN | US | 26th Oct 1990 |
| 192.84.112.0/24 | 256 | ARIN | US | 30th Oct 1990 |
| 192.84.114.0/24 | 256 | ARIN | US | 30th Oct 1990 |
| 192.84.115.0/24 | 256 | ARIN | US | 30th Oct 1990 |
| 192.84.116.0/24 | 256 | ARIN | US | 30th Oct 1990 |