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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,248 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.176.218.0/24 | 256 | ARIN |  US | 29th Sept 1993 |
| 198.176.220.0/24 | 256 | ARIN | US | 29th Sept 1993 |
| 198.176.221.0/24 | 256 | ARIN | US | 30th Sept 1993 |
| 198.176.222.0/24 | 256 | ARIN | US | 30th Sept 1993 |
| 198.176.223.0/24 | 256 | ARIN |  DE | 30th Sept 1993 |
| 198.176.224.0/22 | 1k | ARIN | DE | 30th Sept 1993 |
| 198.176.228.0/24 | 256 | ARIN | US | 30th Sept 1993 |
| 198.176.230.0/24 | 256 | ARIN | US | 30th Sept 1993 |
| 198.176.231.0/24 | 256 | ARIN | US | 30th Sept 1993 |
| 198.176.232.0/24 | 256 | ARIN |  CA | 27th Jun 2024 |
| 198.176.233.0/24 | 256 | ARIN | US | 30th Sept 1993 |
| 198.176.234.0/24 | 256 | ARIN | US | 30th Sept 1993 |
| 198.176.235.0/24 | 256 | ARIN | US | 1st Oct 1993 |
| 198.176.236.0/22 | 1k | ARIN | US | 1st Oct 1993 |
| 198.176.246.0/24 | 256 | ARIN | US | 4th Oct 1993 |
| 198.176.249.0/24 | 256 | ARIN | US | 4th Oct 1993 |
| 198.176.251.0/24 | 256 | ARIN | US | 5th Oct 1993 |
| 198.176.252.0/24 | 256 | ARIN | US | 5th Oct 1993 |
| 198.176.253.0/24 | 256 | ARIN | US | 5th Oct 1993 |
| 198.176.255.0/24 | 256 | ARIN | US | 18th Mar 2013 |
| 198.176.26.0/23 | 512 | ARIN | US | 27th Nov 2013 |
| 198.176.40.0/23 | 512 | ARIN | US | 12th May 1993 |
| 198.176.42.0/24 | 256 | ARIN | US | 12th May 1993 |
| 198.176.43.0/24 | 256 | ARIN | US | 11th Mar 2013 |
| 198.176.8.0/21 | 2k | ARIN | US | 11th May 1993 |
| 198.177.112.0/23 | 512 | ARIN | US | 22nd Feb 1994 |
| 198.177.114.0/24 | 256 | ARIN | US | 3rd Sept 2019 |
| 198.177.128.0/24 | 256 | ARIN | US | 7th Oct 1993 |
| 198.177.129.0/24 | 256 | ARIN | US | 7th Oct 1993 |
| 198.177.130.0/24 | 256 | ARIN | US | 7th Oct 1993 |
| 198.177.131.0/24 | 256 | ARIN | US | 7th Oct 1993 |
| 198.177.132.0/24 | 256 | ARIN | US | 7th Oct 1993 |
| 198.177.133.0/24 | 256 | ARIN | US | 7th Oct 1993 |
| 198.177.134.0/24 | 256 | ARIN | US | 7th Oct 1993 |
| 198.177.135.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 198.177.138.0/24 | 256 | ARIN | US | 7th Oct 1993 |
| 198.177.139.0/24 | 256 | ARIN | US | 7th Oct 1993 |
| 198.177.140.0/24 | 256 | ARIN | US | 7th Oct 1993 |
| 198.177.141.0/24 | 256 | ARIN | US | 8th Oct 1993 |
| 198.177.142.0/23 | 512 | ARIN | US | 8th Oct 1993 |
| 198.177.144.0/24 | 256 | ARIN | US | 8th Oct 1993 |
| 198.177.145.0/24 | 256 | ARIN | US | 8th Oct 1993 |
| 198.177.146.0/24 | 256 | ARIN | US | 8th Oct 1993 |
| 198.177.149.0/24 | 256 | ARIN | US | 8th Oct 1993 |
| 198.177.155.0/24 | 256 | ARIN | US | 12th Oct 1993 |
| 198.177.156.0/24 | 256 | ARIN | US | 12th Oct 1993 |
| 198.177.157.0/24 | 256 | ARIN | US | 12th Oct 1993 |
| 198.177.162.0/24 | 256 | ARIN | US | 12th Oct 1993 |
| 198.177.163.0/24 | 256 | ARIN | US | 12th Oct 1993 |
| 198.177.164.0/22 | 1k | ARIN | US | 12th Oct 1993 |