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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,954 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 57.178.0.0/15 | 131k | RIPE NCC |  US | 21st Jun 1993 |
| 57.186.0.0/15 | 131k | RIPE NCC |  CH | 21st Jun 1993 |
| 57.189.0.0/16 | 65.5k | RIPE NCC | CH | 21st Jun 1993 |
| 57.194.0.0/15 | 131k | RIPE NCC |  IE | 21st Jun 1993 |
| 57.197.0.0/16 | 65.5k | RIPE NCC | IE | 21st Jun 1993 |
| 57.199.0.0/16 | 65.5k | RIPE NCC | IE | 21st Jun 1993 |
| 57.2.0.0/15 | 131k | RIPE NCC | CH | 21st Jun 1993 |
| 57.20.0.0/16 | 65.5k | RIPE NCC | CH | 21st Jun 1993 |
| 57.200.0.0/16 | 65.5k | RIPE NCC | IE | 21st Jun 1993 |
| 57.202.0.0/15 | 131k | RIPE NCC | IE | 21st Jun 1993 |
| 57.205.0.0/16 | 65.5k | RIPE NCC | IE | 21st Jun 1993 |
| 57.206.128.0/17 | 32.8k | RIPE NCC | CH | 21st Jun 1993 |
| 57.206.16.0/20 | 4.1k | RIPE NCC | CH | 21st Jun 1993 |
| 57.206.2.0/23 | 512 | RIPE NCC | CH | 21st Jun 1993 |
| 57.206.32.0/19 | 8.2k | RIPE NCC | CH | 21st Jun 1993 |
| 57.206.4.0/22 | 1k | RIPE NCC | CH | 21st Jun 1993 |
| 57.206.64.0/18 | 16.4k | RIPE NCC | CH | 21st Jun 1993 |
| 57.206.8.0/21 | 2k | RIPE NCC | CH | 21st Jun 1993 |
| 57.207.0.0/16 | 65.5k | RIPE NCC | IE | 21st Jun 1993 |
| 57.208.0.0/12 | 1M | RIPE NCC | IE | 21st Jun 1993 |
| 57.21.0.0/16 | 65.5k | RIPE NCC | IE | 21st Jun 1993 |
| 57.22.0.0/15 | 131k | RIPE NCC | CH | 21st Jun 1993 |
| 57.224.0.0/15 | 131k | RIPE NCC | CH | 21st Jun 1993 |
| 57.227.0.0/16 | 65.5k | RIPE NCC | CH | 21st Jun 1993 |
| 57.228.0.0/15 | 131k | RIPE NCC | CH | 21st Jun 1993 |
| 57.230.0.0/16 | 65.5k | RIPE NCC |  BE | 21st Jun 1993 |
| 57.231.0.0/16 | 65.5k | RIPE NCC | CH | 21st Jun 1993 |
| 57.232.0.0/16 | 65.5k | RIPE NCC | CH | 21st Jun 1993 |
| 57.233.0.0/16 | 65.5k | RIPE NCC | BE | 21st Jun 1993 |
| 57.234.0.0/16 | 65.5k | RIPE NCC | BE | 21st Jun 1993 |
| 57.235.0.0/16 | 65.5k | RIPE NCC | CH | 21st Jun 1993 |
| 57.236.0.0/16 | 65.5k | RIPE NCC | BE | 21st Jun 1993 |
| 57.237.0.0/16 | 65.5k | RIPE NCC | CH | 21st Jun 1993 |
| 57.238.0.0/16 | 65.5k | RIPE NCC | BE | 21st Jun 1993 |
| 57.24.0.0/15 | 131k | RIPE NCC | CH | 21st Jun 1993 |
| 57.241.0.0/16 | 65.5k | RIPE NCC | BE | 21st Jun 1993 |
| 57.242.0.0/16 | 65.5k | RIPE NCC | BE | 21st Jun 1993 |
| 57.245.0.0/16 | 65.5k | RIPE NCC | CH | 21st Jun 1993 |
| 57.247.0.0/16 | 65.5k | RIPE NCC | CH | 21st Jun 1993 |
| 57.249.0.0/16 | 65.5k | RIPE NCC | CH | 21st Jun 1993 |
| 57.252.0.0/15 | 131k | RIPE NCC | CH | 21st Jun 1993 |
| 57.254.0.0/15 | 131k | RIPE NCC | BE | 21st Jun 1993 |
| 57.26.0.0/16 | 65.5k | RIPE NCC | CH | 21st Jun 1993 |
| 57.28.0.0/15 | 131k | RIPE NCC | CH | 21st Jun 1993 |
| 57.30.0.0/15 | 131k | RIPE NCC | BE | 21st Jun 1993 |
| 57.32.0.0/16 | 65.5k | RIPE NCC | CH | 21st Jun 1993 |
| 57.34.0.0/16 | 65.5k | RIPE NCC | CH | 21st Jun 1993 |
| 57.35.0.0/16 | 65.5k | RIPE NCC | IE | 21st Jun 1993 |
| 57.37.0.0/16 | 65.5k | RIPE NCC | CH | 21st Jun 1993 |
| 57.38.0.0/16 | 65.5k | RIPE NCC | BE | 21st Jun 1993 |