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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,239 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 194.102.110.0/23 | 512 | RIPE NCC |  RO | 8th Jul 1998 |
| 194.102.112.0/24 | 256 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.114.0/23 | 512 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.116.0/24 | 256 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.119.0/24 | 256 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.130.0/24 | 256 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.136.0/23 | 512 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.142.0/23 | 512 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.144.0/23 | 512 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.152.0/21 | 2k | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.163.0/24 | 256 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.164.0/22 | 1k | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.191.0/24 | 256 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.196.0/22 | 1k | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.205.0/24 | 256 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.206.0/23 | 512 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.209.0/24 | 256 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.210.0/23 | 512 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.212.0/23 | 512 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.214.0/24 | 256 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.222.0/24 | 256 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.232.0/23 | 512 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.236.0/23 | 512 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.242.0/24 | 256 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.244.0/22 | 1k | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.46.0/23 | 512 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.48.0/21 | 2k | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.65.0/24 | 256 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.68.0/24 | 256 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.69.0/24 | 256 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.71.0/24 | 256 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.75.0/24 | 256 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.76.0/24 | 256 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.78.0/23 | 512 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.82.0/23 | 512 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.84.0/24 | 256 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.87.0/24 | 256 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.92.0/24 | 256 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.94.0/23 | 512 | RIPE NCC | RO | 8th Jul 1998 |
| 194.102.96.0/23 | 512 | RIPE NCC | RO | 8th Jul 1998 |
| 194.104.12.0/22 | 1k | RIPE NCC |  LU | 1st Aug 2018 |
| 194.104.120.0/24 | 256 | RIPE NCC |  AE | 5th Oct 2023 |
| 194.104.127.0/24 | 256 | RIPE NCC |  DK | 6th Aug 2025 |
| 194.104.132.0/24 | 256 | RIPE NCC |  BG | 30th Sept 2021 |
| 194.104.134.0/24 | 256 | RIPE NCC |  DE | 27th Jan 2026 |
| 194.104.136.0/24 | 256 | RIPE NCC |  MD | 1st Oct 2021 |
| 194.104.137.0/24 | 256 | RIPE NCC |  TR | 1st Oct 2021 |
| 194.104.139.0/24 | 256 | RIPE NCC |  HK | 1st Oct 2021 |
| 194.104.140.0/24 | 256 | RIPE NCC | HK | 1st Oct 2021 |
| 194.104.141.0/24 | 256 | RIPE NCC |  ES | 1st Oct 2021 |