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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 199.201.162.0/23 | 512 | ARIN |  US | 28th Apr 1994 |
| 199.201.164.0/22 | 1k | ARIN | US | 28th Apr 1994 |
| 199.201.168.0/24 | 256 | ARIN | US | 28th Apr 1994 |
| 199.201.169.0/24 | 256 | ARIN | US | 29th Apr 1994 |
| 199.201.170.0/23 | 512 | ARIN | US | 29th Apr 1994 |
| 199.201.172.0/23 | 512 | ARIN | US | 29th Apr 1994 |
| 199.201.175.0/24 | 256 | ARIN | US | 29th Apr 1994 |
| 199.201.176.0/23 | 512 | ARIN | US | 29th Apr 1994 |
| 199.201.178.0/23 | 512 | ARIN | US | 29th Apr 1994 |
| 199.201.180.0/24 | 256 | ARIN | US | 29th Apr 1994 |
| 199.201.181.0/24 | 256 | ARIN | US | 29th Apr 1994 |
| 199.201.182.0/24 | 256 | ARIN | US | 29th Apr 1994 |
| 199.201.183.0/24 | 256 | ARIN | US | 29th Apr 1994 |
| 199.201.185.0/24 | 256 | ARIN | US | 29th Apr 1994 |
| 199.201.187.0/24 | 256 | ARIN | US | 29th Apr 1994 |
| 199.201.188.0/24 | 256 | ARIN | US | 29th Apr 1994 |
| 199.201.189.0/24 | 256 | ARIN | US | 29th Apr 1994 |
| 199.201.192.0/24 | 256 | ARIN | US | 29th Apr 1994 |
| 199.201.194.0/24 | 256 | ARIN | US | 29th Apr 1994 |
| 199.201.195.0/24 | 256 | ARIN | US | 29th Apr 1994 |
| 199.201.196.0/24 | 256 | ARIN | US | 29th Apr 1994 |
| 199.201.197.0/24 | 256 | ARIN | US | 29th Apr 1994 |
| 199.201.198.0/24 | 256 | ARIN | US | 29th Apr 1994 |
| 199.201.199.0/24 | 256 | ARIN | US | 29th Apr 1994 |
| 199.201.20.0/22 | 1k | ARIN | US | 18th Mar 1994 |
| 199.201.200.0/23 | 512 | ARIN | US | 29th Apr 1994 |
| 199.201.202.0/24 | 256 | ARIN | US | 29th Apr 1994 |
| 199.201.204.0/24 | 256 | ARIN | US | 2nd May 1994 |
| 199.201.205.0/24 | 256 | ARIN | US | 2nd May 1994 |
| 199.201.206.0/23 | 512 | ARIN | US | 2nd May 1994 |
| 199.201.208.0/22 | 1k | ARIN | US | 2nd May 1994 |
| 199.201.213.0/24 | 256 | ARIN | US | 3rd May 1994 |
| 199.201.214.0/24 | 256 | ARIN | US | 3rd May 1994 |
| 199.201.215.0/24 | 256 | ARIN | US | 3rd May 1994 |
| 199.201.217.0/24 | 256 | ARIN | US | 3rd May 1994 |
| 199.201.218.0/24 | 256 | ARIN | US | 3rd May 1994 |
| 199.201.219.0/24 | 256 | ARIN | US | 3rd May 1994 |
| 199.201.220.0/24 | 256 | ARIN | US | 3rd May 1994 |
| 199.201.224.0/24 | 256 | ARIN | US | 5th May 1994 |
| 199.201.226.0/23 | 512 | ARIN |  CA | 5th May 1994 |
| 199.201.228.0/23 | 512 | ARIN | CA | 5th May 1994 |
| 199.201.230.0/24 | 256 | ARIN | US | 5th May 1994 |
| 199.201.231.0/24 | 256 | ARIN | US | 5th May 1994 |
| 199.201.232.0/22 | 1k | ARIN | US | 5th May 1994 |
| 199.201.238.0/24 | 256 | ARIN | US | 2nd May 1994 |
| 199.201.239.0/24 | 256 | ARIN | US | 2nd May 1994 |
| 199.201.24.0/23 | 512 | ARIN | US | 18th Mar 1994 |
| 199.201.240.0/24 | 256 | ARIN | US | 5th May 1994 |
| 199.201.241.0/24 | 256 | ARIN | US | 5th May 1994 |
| 199.201.244.0/24 | 256 | ARIN | US | 5th May 1994 |