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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,244 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.140.246.0/23 | 512 | ARIN |  US | 15th Jul 1993 |
| 198.140.248.0/23 | 512 | ARIN | US | 15th Jul 1993 |
| 198.140.250.0/23 | 512 | ARIN | US | 22nd Jun 1993 |
| 198.140.252.0/23 | 512 | ARIN | US | 22nd Jun 1993 |
| 198.140.254.0/24 | 256 | ARIN | US | 22nd Jun 1993 |
| 198.140.48.0/22 | 1k | ARIN | US | 16th Apr 1993 |
| 198.140.52.0/23 | 512 | ARIN | US | 16th Apr 1993 |
| 198.140.54.0/24 | 256 | ARIN | US | 16th Apr 1993 |
| 198.140.55.0/24 | 256 | ARIN | US | 16th Apr 1993 |
| 198.140.56.0/24 | 256 | ARIN | US | 16th Apr 1993 |
| 198.140.57.0/24 | 256 | ARIN | US | 16th Apr 1993 |
| 198.140.58.0/23 | 512 | ARIN | US | 16th Apr 1993 |
| 198.140.64.0/19 | 8.2k | ARIN | US | 13th Sept 1993 |
| 198.140.96.0/20 | 4.1k | ARIN | US | 13th Sept 1993 |
| 198.145.35.0/24 | 256 | ARIN | US | 28th May 1996 |
| 198.145.37.0/24 | 256 | ARIN | US | 28th May 1996 |
| 198.145.44.0/23 | 512 | ARIN | US | 20th Jul 2023 |
| 198.147.128.0/24 | 256 | ARIN | US | 25th May 1993 |
| 198.147.129.0/24 | 256 | ARIN | US | 25th May 1993 |
| 198.147.130.0/23 | 512 | ARIN | US | 25th May 1993 |
| 198.147.132.0/23 | 512 | ARIN | US | 25th May 1993 |
| 198.147.134.0/24 | 256 | ARIN | US | 28th May 1993 |
| 198.147.135.0/24 | 256 | ARIN | US | 28th May 1993 |
| 198.147.136.0/24 | 256 | ARIN | US | 24th Jan 2014 |
| 198.147.137.0/24 | 256 | ARIN | US | 28th May 1993 |
| 198.147.142.0/23 | 512 | ARIN | US | 28th May 1993 |
| 198.147.144.0/24 | 256 | ARIN | US | 28th May 1993 |
| 198.147.145.0/24 | 256 | ARIN | US | 28th May 1993 |
| 198.147.147.0/24 | 256 | ARIN | US | 19th Dec 2023 |
| 198.147.148.0/24 | 256 | ARIN | US | 28th May 1993 |
| 198.147.149.0/24 | 256 | ARIN | US | 28th May 1993 |
| 198.147.150.0/24 | 256 | ARIN | US | 28th May 1993 |
| 198.147.151.0/24 | 256 | ARIN | US | 28th May 1993 |
| 198.147.153.0/24 | 256 | ARIN | US | 28th May 1993 |
| 198.147.154.0/24 | 256 | ARIN | US | 1st Jun 1993 |
| 198.147.155.0/24 | 256 | ARIN | US | 1st Jun 1993 |
| 198.147.157.0/24 | 256 | ARIN | US | 1st Jun 1993 |
| 198.147.159.0/24 | 256 | ARIN | US | 1st Jun 1993 |
| 198.147.163.0/24 | 256 | ARIN | US | 2nd Jun 1993 |
| 198.147.164.0/24 | 256 | ARIN | US | 2nd Jun 1993 |
| 198.147.165.0/24 | 256 | ARIN | US | 2nd Jun 1993 |
| 198.147.166.0/24 | 256 | ARIN | US | 2nd Jun 1993 |
| 198.147.167.0/24 | 256 | ARIN | US | 2nd Jun 1993 |
| 198.147.170.0/23 | 512 | ARIN | US | 4th Jun 1993 |
| 198.147.172.0/23 | 512 | ARIN | US | 4th Jun 1993 |
| 198.147.174.0/24 | 256 | ARIN | US | 4th Jun 1993 |
| 198.147.177.0/24 | 256 | ARIN | US | 7th Jun 1993 |
| 198.147.178.0/24 | 256 | ARIN | US | 7th Jun 1993 |
| 198.147.179.0/24 | 256 | ARIN | US | 7th Jun 1993 |
| 198.147.180.0/24 | 256 | ARIN | US | 7th Jun 1993 |