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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in United States
27,034 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 199.26.171.0/24 | 256 | ARIN |  US | 3rd Jan 1994 |
| 199.26.173.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.174.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.175.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.177.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.178.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.179.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.180.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.182.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.185.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.186.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 199.26.187.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 199.26.188.0/23 | 512 | ARIN | US | 4th Jan 1994 |
| 199.26.193.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 199.26.194.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 199.26.195.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 199.26.196.0/23 | 512 | ARIN | US | 4th Jan 1994 |
| 199.26.198.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 199.26.199.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 199.26.200.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 199.26.201.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 199.26.202.0/24 | 256 | ARIN | US | 10th Jun 1995 |
| 199.26.203.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 199.26.204.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 199.26.206.0/24 | 256 | ARIN | US | 5th Jan 1994 |
| 199.26.207.0/24 | 256 | ARIN | US | 5th Jan 1994 |
| 199.26.208.0/24 | 256 | ARIN | US | 5th Jan 1994 |
| 199.26.209.0/24 | 256 | ARIN | US | 5th Jan 1994 |
| 199.26.211.0/24 | 256 | ARIN | US | 5th Jan 1994 |
| 199.26.213.0/24 | 256 | ARIN | US | 6th Jan 1994 |
| 199.26.214.0/23 | 512 | ARIN | US | 6th Jan 1994 |
| 199.26.216.0/24 | 256 | ARIN | US | 6th Jan 1994 |
| 199.26.217.0/24 | 256 | ARIN | US | 6th Jan 1994 |
| 199.26.218.0/24 | 256 | ARIN | US | 6th Jan 1994 |
| 199.26.219.0/24 | 256 | ARIN | US | 1st Jul 2022 |
| 199.26.224.0/24 | 256 | ARIN | US | 6th Jan 1994 |
| 199.26.226.0/23 | 512 | ARIN | US | 6th Jan 1994 |
| 199.26.228.0/22 | 1k | ARIN | US | 6th Jan 1994 |
| 199.26.232.0/23 | 512 | ARIN | US | 6th Jan 1994 |
| 199.26.235.0/24 | 256 | ARIN | US | 6th Jan 1994 |
| 199.26.237.0/24 | 256 | ARIN | US | 6th Jan 1994 |
| 199.26.238.0/24 | 256 | ARIN | US | 6th Jan 1994 |
| 199.26.239.0/24 | 256 | ARIN | US | 6th Jan 1994 |
| 199.26.240.0/24 | 256 | ARIN | US | 6th Jan 1994 |
| 199.26.241.0/24 | 256 | ARIN | US | 6th Jan 1994 |
| 199.26.248.0/24 | 256 | ARIN | US | 6th Jan 1994 |
| 199.26.249.0/24 | 256 | ARIN | US | 6th Jan 1994 |
| 199.26.250.0/24 | 256 | ARIN | US | 6th Jan 1994 |
| 199.26.251.0/24 | 256 | ARIN | US | 6th Jan 1994 |
| 199.26.252.0/24 | 256 | ARIN | US | 7th Jan 1994 |