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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,248 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.185.204.0/24 | 256 | ARIN |  US | 22nd Jan 1994 |
| 198.185.205.0/24 | 256 | ARIN | US | 22nd Jan 1994 |
| 198.185.206.0/24 | 256 | ARIN | US | 22nd Jan 1994 |
| 198.185.208.0/24 | 256 | ARIN | US | 22nd Jan 1994 |
| 198.185.209.0/24 | 256 | ARIN | US | 22nd Jan 1994 |
| 198.185.213.0/24 | 256 | ARIN | US | 22nd Jan 1994 |
| 198.185.216.0/24 | 256 | ARIN | US | 22nd Jan 1994 |
| 198.185.220.0/24 | 256 | ARIN | US | 20th Sept 2019 |
| 198.185.221.0/24 | 256 | ARIN | US | 22nd Jan 1994 |
| 198.185.222.0/23 | 512 | ARIN | US | 22nd Jan 1994 |
| 198.185.224.0/24 | 256 | ARIN | US | 22nd Jan 1994 |
| 198.185.225.0/24 | 256 | ARIN | US | 22nd Jan 1994 |
| 198.185.226.0/24 | 256 | ARIN | US | 22nd Jan 1994 |
| 198.185.227.0/24 | 256 | ARIN | US | 22nd Jan 1994 |
| 198.185.229.0/24 | 256 | ARIN | US | 22nd Jan 1994 |
| 198.185.230.0/23 | 512 | ARIN | US | 22nd Jan 1994 |
| 198.185.232.0/23 | 512 | ARIN | US | 22nd Jan 1994 |
| 198.185.234.0/24 | 256 | ARIN | US | 22nd Jan 1994 |
| 198.185.235.0/24 | 256 | ARIN | US | 22nd Jan 1994 |
| 198.185.236.0/24 | 256 | ARIN | US | 22nd Jan 1994 |
| 198.185.237.0/24 | 256 | ARIN | US | 22nd Jan 1994 |
| 198.185.238.0/23 | 512 | ARIN | US | 22nd Jan 1994 |
| 198.185.240.0/24 | 256 | ARIN | US | 22nd Jan 1994 |
| 198.185.242.0/24 | 256 | ARIN | US | 24th Jan 1994 |
| 198.185.243.0/24 | 256 | ARIN | US | 24th Jan 1994 |
| 198.185.244.0/24 | 256 | ARIN | US | 24th Jan 1994 |
| 198.185.245.0/24 | 256 | ARIN | US | 24th Jan 1994 |
| 198.185.246.0/24 | 256 | ARIN | US | 24th Jan 1994 |
| 198.185.247.0/24 | 256 | ARIN | US | 1st Feb 1994 |
| 198.185.248.0/23 | 512 | ARIN | US | 1st Feb 1994 |
| 198.185.250.0/23 | 512 | ARIN | US | 1st Feb 1994 |
| 198.186.0.0/22 | 1k | ARIN | US | 7th Jun 1993 |
| 198.186.129.0/24 | 256 | ARIN | US | 5th Feb 2014 |
| 198.186.132.0/24 | 256 | ARIN | US | 13th Sept 1993 |
| 198.186.133.0/24 | 256 | ARIN | US | 13th Sept 1993 |
| 198.186.134.0/24 | 256 | ARIN | US | 13th Sept 1993 |
| 198.186.135.0/24 | 256 | ARIN | US | 14th Sept 1993 |
| 198.186.136.0/24 | 256 | ARIN | US | 14th Sept 1993 |
| 198.186.139.0/24 | 256 | ARIN | US | 14th Sept 1993 |
| 198.186.142.0/24 | 256 | ARIN | US | 14th Sept 1993 |
| 198.186.143.0/24 | 256 | ARIN | US | 1st Dec 2022 |
| 198.186.146.0/24 | 256 | ARIN | US | 14th Sept 1993 |
| 198.186.147.0/24 | 256 | ARIN | US | 14th Sept 1993 |
| 198.186.148.0/24 | 256 | ARIN | US | 14th Sept 1993 |
| 198.186.150.0/24 | 256 | ARIN | US | 14th Sept 1993 |
| 198.186.154.0/24 | 256 | ARIN | US | 15th Sept 1993 |
| 198.186.155.0/24 | 256 | ARIN | US | 15th Sept 1993 |
| 198.186.16.0/20 | 4.1k | ARIN | US | 21st Jun 1993 |
| 198.186.161.0/24 | 256 | ARIN | US | 15th Sept 1993 |
| 198.186.164.0/24 | 256 | ARIN | US | 15th Sept 1993 |