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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 193.53.42.0/23 | 512 | RIPE NCC |  SE | 18th Apr 1994 |
| 193.53.44.0/24 | 256 | RIPE NCC | SE | 18th Apr 1994 |
| 193.53.45.0/24 | 256 | RIPE NCC |  BE | 18th Apr 1994 |
| 193.53.46.0/24 | 256 | RIPE NCC | BE | 18th Apr 1994 |
| 193.53.47.0/24 | 256 | RIPE NCC | BE | 18th Apr 1994 |
| 193.53.6.0/24 | 256 | RIPE NCC |  GB | 18th Apr 1994 |
| 193.53.64.0/20 | 4.1k | RIPE NCC | BE | 18th Apr 1994 |
| 193.53.82.0/24 | 256 | RIPE NCC | SE | 14th Nov 2019 |
| 193.53.84.0/24 | 256 | RIPE NCC | SE | 25th Feb 2009 |
| 193.53.94.0/23 | 512 | RIPE NCC | GB | 18th Apr 1994 |
| 193.56.100.0/24 | 256 | RIPE NCC |  FR | 12th Oct 1992 |
| 193.56.101.0/24 | 256 | RIPE NCC | FR | 12th Oct 1992 |
| 193.56.102.0/24 | 256 | RIPE NCC | FR | 12th Oct 1992 |
| 193.56.104.0/23 | 512 | RIPE NCC |  PL | 10th Oct 2019 |
| 193.56.115.0/24 | 256 | RIPE NCC | FR | 10th Jun 1994 |
| 193.56.119.0/24 | 256 | RIPE NCC | FR | 25th Mar 1994 |
| 193.56.120.0/24 | 256 | RIPE NCC |  KZ | 22nd Jun 2026 |
| 193.56.121.0/24 | 256 | RIPE NCC |  EE | 22nd Jun 2026 |
| 193.56.122.0/24 | 256 | RIPE NCC | EE | 22nd Jun 2026 |
| 193.56.123.0/24 | 256 | RIPE NCC |  FI | 22nd Jun 2026 |
| 193.56.128.0/24 | 256 | RIPE NCC | FR | 3rd Nov 1992 |
| 193.56.158.0/23 | 512 | RIPE NCC |  DE | 10th Oct 2019 |
| 193.56.162.0/23 | 512 | RIPE NCC | DE | 10th Oct 2019 |
| 193.56.183.0/24 | 256 | RIPE NCC |  IT | 17th Dec 2025 |
| 193.56.187.0/24 | 256 | RIPE NCC | FR | 19th Apr 1994 |
| 193.56.188.0/24 | 256 | RIPE NCC |  RU | 15th Nov 2019 |
| 193.56.189.0/24 | 256 | RIPE NCC | FR | 19th Apr 1994 |
| 193.56.190.0/24 | 256 | RIPE NCC | RU | 15th Nov 2019 |
| 193.56.191.0/24 | 256 | RIPE NCC | FR | 19th Apr 1994 |
| 193.56.210.0/24 | 256 | RIPE NCC | FR | 18th Nov 1993 |
| 193.56.225.0/24 | 256 | RIPE NCC | FR | 26th Apr 1994 |
| 193.56.228.0/24 | 256 | RIPE NCC | FR | 25th May 1993 |
| 193.56.229.0/24 | 256 | RIPE NCC | FR | 25th May 1993 |
| 193.56.30.0/24 | 256 | RIPE NCC | RU | 4th Jul 2025 |
| 193.56.31.0/24 | 256 | RIPE NCC | BE | 4th Jul 2025 |
| 193.56.34.0/24 | 256 | RIPE NCC | FR | 27th Aug 1992 |
| 193.56.42.0/24 | 256 | RIPE NCC | FR | 27th Aug 1992 |
| 193.56.47.0/24 | 256 | RIPE NCC | FR | 10th Jun 1994 |
| 193.56.48.0/22 | 1k | RIPE NCC | FR | 18th Oct 1993 |
| 193.56.52.0/24 | 256 | RIPE NCC | FR | 18th Oct 1993 |
| 193.56.60.0/24 | 256 | RIPE NCC | FR | 7th Apr 1993 |
| 193.56.85.0/24 | 256 | RIPE NCC | FR | 12th Oct 1992 |
| 193.56.86.0/24 | 256 | RIPE NCC | FR | 12th Oct 1992 |
| 193.56.88.0/24 | 256 | RIPE NCC | FR | 12th Oct 1992 |
| 193.56.89.0/24 | 256 | RIPE NCC | FR | 12th Oct 1992 |
| 193.56.90.0/24 | 256 | RIPE NCC | FR | 12th Oct 1992 |
| 193.56.91.0/24 | 256 | RIPE NCC | FR | 12th Oct 1992 |
| 193.56.92.0/24 | 256 | RIPE NCC | FR | 12th Oct 1992 |
| 193.56.93.0/24 | 256 | RIPE NCC | FR | 12th Oct 1992 |
| 193.56.94.0/24 | 256 | RIPE NCC | FR | 12th Oct 1992 |