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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,285 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 199.201.246.0/24 | 256 | ARIN |  US | 5th May 1994 |
| 199.201.247.0/24 | 256 | ARIN | US | 5th May 1994 |
| 199.201.250.0/24 | 256 | ARIN | US | 5th May 1994 |
| 199.201.251.0/24 | 256 | ARIN | US | 5th May 1994 |
| 199.201.252.0/24 | 256 | ARIN | US | 5th May 1994 |
| 199.201.253.0/24 | 256 | ARIN | US | 5th May 1994 |
| 199.201.254.0/24 | 256 | ARIN | US | 5th May 1994 |
| 199.201.26.0/24 | 256 | ARIN | US | 18th Mar 1994 |
| 199.201.27.0/24 | 256 | ARIN | US | 18th Mar 1994 |
| 199.201.28.0/22 | 1k | ARIN | US | 18th Mar 1994 |
| 199.201.8.0/21 | 2k | ARIN | US | 28th Apr 1994 |
| 199.202.102.0/23 | 512 | ARIN |  CA | 18th Mar 1994 |
| 199.202.112.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.113.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.136.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.140.0/22 | 1k | ARIN | CA | 18th Mar 1994 |
| 199.202.149.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.150.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.151.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.152.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.155.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.156.0/22 | 1k | ARIN | CA | 18th Mar 1994 |
| 199.202.160.0/21 | 2k | ARIN | CA | 18th Mar 1994 |
| 199.202.168.0/23 | 512 | ARIN | CA | 18th Mar 1994 |
| 199.202.170.0/23 | 512 | ARIN | CA | 18th Mar 1994 |
| 199.202.172.0/22 | 1k | ARIN | CA | 18th Mar 1994 |
| 199.202.176.0/22 | 1k | ARIN | CA | 18th Mar 1994 |
| 199.202.180.0/22 | 1k | ARIN | CA | 18th Mar 1994 |
| 199.202.184.0/21 | 2k | ARIN | CA | 18th Mar 1994 |
| 199.202.192.0/23 | 512 | ARIN | CA | 18th Mar 1994 |
| 199.202.194.0/23 | 512 | ARIN | CA | 18th Mar 1994 |
| 199.202.196.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.197.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.199.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.201.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.202.0/23 | 512 | ARIN | CA | 18th Mar 1994 |
| 199.202.205.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.206.0/23 | 512 | ARIN | CA | 18th Mar 1994 |
| 199.202.208.0/22 | 1k | ARIN | CA | 18th Mar 1994 |
| 199.202.240.0/20 | 4.1k | ARIN | US | 14th Jun 1994 |
| 199.202.65.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.66.0/23 | 512 | ARIN | CA | 18th May 1994 |
| 199.202.68.0/22 | 1k | ARIN | CA | 18th May 1994 |
| 199.202.89.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.90.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.92.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.93.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.94.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.204.104.0/22 | 1k | ARIN | US | 19th Apr 2010 |
| 199.204.144.0/21 | 2k | ARIN | US | 22nd Apr 2010 |