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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 199.245.32.0/20 | 4.1k | ARIN |  US | 2nd Jun 1994 |
| 199.245.48.0/22 | 1k | ARIN | US | 2nd Jun 1994 |
| 199.245.64.0/24 | 256 | ARIN | US | 15th Jul 1994 |
| 199.245.65.0/24 | 256 | ARIN | US | 15th Jul 1994 |
| 199.245.66.0/23 | 512 | ARIN | US | 15th Jul 1994 |
| 199.245.68.0/24 | 256 | ARIN | US | 15th Jul 1994 |
| 199.245.69.0/24 | 256 | ARIN | US | 15th Jul 1994 |
| 199.245.70.0/24 | 256 | ARIN | US | 18th Jul 1994 |
| 199.245.71.0/24 | 256 | ARIN | US | 6th Jul 2026 |
| 199.245.72.0/24 | 256 | ARIN | US | 18th Jul 1994 |
| 199.245.73.0/24 | 256 | ARIN | US | 26th Dec 2024 |
| 199.245.74.0/23 | 512 | ARIN | US | 18th Jul 1994 |
| 199.245.76.0/22 | 1k | ARIN | US | 18th Jul 1994 |
| 199.245.80.0/24 | 256 | ARIN | US | 18th Jul 1994 |
| 199.245.81.0/24 | 256 | ARIN | US | 18th Jul 1994 |
| 199.245.82.0/24 | 256 | ARIN | US | 18th Jul 1994 |
| 199.245.83.0/24 | 256 | ARIN | US | 18th Jul 1994 |
| 199.245.84.0/24 | 256 | ARIN | US | 18th Jul 1994 |
| 199.245.85.0/24 | 256 | ARIN | US | 18th Jul 1994 |
| 199.245.92.0/24 | 256 | ARIN | US | 18th Jul 1994 |
| 199.245.93.0/24 | 256 | ARIN | US | 18th Jul 1994 |
| 199.245.94.0/24 | 256 | ARIN | US | 18th Jul 1994 |
| 199.245.95.0/24 | 256 | ARIN | US | 18th Jul 1994 |
| 199.245.96.0/24 | 256 | ARIN | US | 18th Jul 1994 |
| 199.246.0.0/24 | 256 | ARIN | US | 13th Mar 2012 |
| 199.246.1.0/24 | 256 | ARIN |  CA | 14th May 1994 |
| 199.246.10.0/23 | 512 | ARIN | CA | 14th May 1994 |
| 199.246.104.0/23 | 512 | ARIN | CA | 14th May 1994 |
| 199.246.108.0/24 | 256 | ARIN | CA | 24th Jun 1994 |
| 199.246.109.0/24 | 256 | ARIN | CA | 24th Jun 1994 |
| 199.246.112.0/24 | 256 | ARIN | CA | 3rd Jun 1994 |
| 199.246.117.0/24 | 256 | ARIN | CA | 3rd Jun 1994 |
| 199.246.118.0/23 | 512 | ARIN | CA | 1st Jun 1994 |
| 199.246.12.0/22 | 1k | ARIN | CA | 14th May 1994 |
| 199.246.132.0/24 | 256 | ARIN | CA | 14th May 1994 |
| 199.246.133.0/24 | 256 | ARIN | CA | 14th May 1994 |
| 199.246.134.0/24 | 256 | ARIN | CA | 14th May 1994 |
| 199.246.135.0/24 | 256 | ARIN | CA | 14th May 1994 |
| 199.246.136.0/24 | 256 | ARIN | CA | 14th May 1994 |
| 199.246.138.0/24 | 256 | ARIN | CA | 14th May 1994 |
| 199.246.150.0/23 | 512 | ARIN | CA | 23rd May 1994 |
| 199.246.152.0/23 | 512 | ARIN | CA | 23rd May 1994 |
| 199.246.154.0/24 | 256 | ARIN | CA | 23rd May 1994 |
| 199.246.155.0/24 | 256 | ARIN | CA | 23rd May 1994 |
| 199.246.16.0/21 | 2k | ARIN | CA | 14th May 1994 |
| 199.246.180.0/22 | 1k | ARIN | CA | 17th May 1994 |
| 199.246.184.0/21 | 2k | ARIN | CA | 17th May 1994 |
| 199.246.192.0/21 | 2k | ARIN | CA | 17th May 1994 |
| 199.246.200.0/21 | 2k | ARIN | CA | 23rd May 1994 |
| 199.246.208.0/23 | 512 | ARIN | CA | 23rd May 1994 |