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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,285 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 199.184.210.0/24 | 256 | ARIN |  US | 15th Apr 1994 |
| 199.184.212.0/24 | 256 | ARIN | US | 15th Apr 1994 |
| 199.184.213.0/24 | 256 | ARIN | US | 15th Apr 1994 |
| 199.184.216.0/24 | 256 | ARIN | US | 18th Apr 1994 |
| 199.184.217.0/24 | 256 | ARIN | US | 18th Apr 1994 |
| 199.184.218.0/24 | 256 | ARIN | US | 14th Mar 1997 |
| 199.184.219.0/24 | 256 | ARIN | US | 19th Apr 1994 |
| 199.184.220.0/24 | 256 | ARIN | US | 19th Apr 1994 |
| 199.184.221.0/24 | 256 | ARIN | US | 19th Apr 1994 |
| 199.184.223.0/24 | 256 | ARIN | US | 19th Apr 1994 |
| 199.184.224.0/24 | 256 | ARIN | US | 19th Apr 1994 |
| 199.184.225.0/24 | 256 | ARIN | US | 19th Apr 1994 |
| 199.184.226.0/24 | 256 | ARIN | US | 19th Apr 1994 |
| 199.184.229.0/24 | 256 | ARIN | US | 19th Apr 1994 |
| 199.184.230.0/24 | 256 | ARIN | US | 19th Apr 1994 |
| 199.184.231.0/24 | 256 | ARIN | US | 19th Apr 1994 |
| 199.184.239.0/24 | 256 | ARIN | US | 19th Apr 1994 |
| 199.184.242.0/24 | 256 | ARIN | US | 19th Apr 1994 |
| 199.184.243.0/24 | 256 | ARIN | US | 19th Apr 1994 |
| 199.184.244.0/24 | 256 | ARIN | US | 19th Apr 1994 |
| 199.184.245.0/24 | 256 | ARIN | US | 19th Apr 1994 |
| 199.184.248.0/24 | 256 | ARIN | US | 19th Apr 1994 |
| 199.184.249.0/24 | 256 | ARIN | US | 19th Apr 1994 |
| 199.184.250.0/24 | 256 | ARIN | US | 19th Apr 1994 |
| 199.184.251.0/24 | 256 | ARIN | US | 19th Apr 1994 |
| 199.184.252.0/24 | 256 | ARIN | US | 19th Apr 1994 |
| 199.184.254.0/24 | 256 | ARIN | US | 19th Apr 1994 |
| 199.184.69.0/24 | 256 | ARIN | US | 27th Jul 1994 |
| 199.184.70.0/23 | 512 | ARIN | US | 27th Jul 1994 |
| 199.184.72.0/23 | 512 | ARIN | US | 27th Jul 1994 |
| 199.184.74.0/24 | 256 | ARIN | US | 27th Jul 1994 |
| 199.184.75.0/24 | 256 | ARIN | US | 27th Jul 1994 |
| 199.184.76.0/24 | 256 | ARIN | US | 27th Jul 1994 |
| 199.184.77.0/24 | 256 | ARIN | US | 27th Jul 1994 |
| 199.184.78.0/23 | 512 | ARIN | US | 27th Jul 1994 |
| 199.184.8.0/22 | 1k | ARIN | US | 8th Mar 1994 |
| 199.184.82.0/24 | 256 | ARIN | US | 27th Jul 1994 |
| 199.184.84.0/24 | 256 | ARIN | US | 28th Jul 1994 |
| 199.184.86.0/24 | 256 | ARIN | US | 28th Jul 1994 |
| 199.184.87.0/24 | 256 | ARIN | US | 28th Jul 1994 |
| 199.184.90.0/24 | 256 | ARIN | US | 28th Jul 1994 |
| 199.185.110.0/24 | 256 | ARIN |  CA | 22nd Feb 1994 |
| 199.185.114.0/23 | 512 | ARIN | CA | 22nd Feb 1994 |
| 199.185.118.0/24 | 256 | ARIN | CA | 22nd Feb 1994 |
| 199.185.119.0/24 | 256 | ARIN | CA | 22nd Feb 1994 |
| 199.185.12.0/24 | 256 | ARIN | CA | 22nd Feb 1994 |
| 199.185.127.0/24 | 256 | ARIN | CA | 22nd Feb 1994 |
| 199.185.128.0/23 | 512 | ARIN | CA | 22nd Feb 1994 |
| 199.185.13.0/24 | 256 | ARIN | US | 15th Jul 2022 |
| 199.185.140.0/22 | 1k | ARIN | CA | 22nd Feb 1994 |