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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in United States
27,019 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.82.240.0/24 | 256 | ARIN |  US | 26th Mar 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 |
| 192.83.158.0/24 | 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 |
| 192.83.204.0/24 | 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 |
| 192.83.225.0/24 | 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 |
| 192.83.233.0/24 | 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 |
| 192.83.250.0/24 | 256 | ARIN | US | 8th 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 |
| 192.84.117.0/24 | 256 | ARIN | US | 30th Oct 1990 |
| 192.84.118.0/24 | 256 | ARIN | US | 30th Oct 1990 |
| 192.84.119.0/24 | 256 | ARIN | US | 30th Oct 1990 |
| 192.84.126.0/24 | 256 | ARIN | US | 15th Jan 2015 |
| 192.84.159.0/24 | 256 | ARIN | US | 2nd Aug 2011 |
| 192.84.162.0/24 | 256 | ARIN | US | 31st Oct 1990 |
| 192.84.163.0/24 | 256 | ARIN | US | 31st Oct 1990 |
| 192.84.164.0/24 | 256 | ARIN | US | 31st Oct 1990 |
| 192.84.165.0/24 | 256 | ARIN | US | 31st Oct 1990 |
| 192.84.167.0/24 | 256 | ARIN | US | 31st Oct 1990 |
| 192.84.169.0/24 | 256 | ARIN | US | 31st Oct 1990 |
| 192.84.170.0/24 | 256 | ARIN | US | 31st Oct 1990 |
| 192.84.172.0/24 | 256 | ARIN | US | 6th Nov 1990 |