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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 194.5.144.0/24 | 256 | RIPE NCC |  CH | 6th Jan 1995 |
| 194.5.164.0/23 | 512 | RIPE NCC |  DE | 18th Oct 2019 |
| 194.5.168.0/23 | 512 | RIPE NCC | DE | 18th Oct 2019 |
| 194.5.17.0/24 | 256 | RIPE NCC |  FR | 24th Aug 1994 |
| 194.5.174.0/24 | 256 | RIPE NCC | FR | 31st Jan 1995 |
| 194.5.18.0/23 | 512 | RIPE NCC | FR | 24th Aug 1994 |
| 194.5.184.0/22 | 1k | RIPE NCC |  AT | 14th May 2018 |
| 194.5.194.0/24 | 256 | RIPE NCC | FR | 20th Feb 1995 |
| 194.5.20.0/22 | 1k | RIPE NCC | FR | 24th Aug 1994 |
| 194.5.204.0/24 | 256 | RIPE NCC | FR | 1st Mar 1995 |
| 194.5.253.0/24 | 256 | RIPE NCC | DE | 8th Jun 1995 |
| 194.5.34.0/24 | 256 | RIPE NCC | FR | 29th Sept 1994 |
| 194.5.35.0/24 | 256 | RIPE NCC | FR | 29th Sept 1994 |
| 194.5.36.0/22 | 1k | RIPE NCC |  CY | 29th Sept 1994 |
| 194.5.40.0/22 | 1k | RIPE NCC |  IR | 20th Jul 2018 |
| 194.5.51.0/24 | 256 | RIPE NCC | DE | 17th Oct 1994 |
| 194.5.55.0/24 | 256 | RIPE NCC | FR | 21st Oct 1994 |
| 194.5.56.0/22 | 1k | RIPE NCC |  ES | 14th May 2018 |
| 194.5.86.0/24 | 256 | RIPE NCC |  US | 20th Nov 2019 |
| 194.50.100.0/24 | 256 | RIPE NCC |  CZ | 1st Sept 1993 |
| 194.50.102.0/24 | 256 | RIPE NCC |  DK | 31st Mar 2006 |
| 194.50.104.0/24 | 256 | RIPE NCC |  RU | 31st Mar 2006 |
| 194.50.140.0/24 | 256 | RIPE NCC |  SE | 21st Feb 2012 |
| 194.50.165.0/24 | 256 | RIPE NCC |  GB | 13th Apr 2006 |
| 194.50.182.0/24 | 256 | RIPE NCC | DE | 21st Apr 2006 |
| 194.50.203.0/24 | 256 | RIPE NCC | CZ | 1st Sept 1993 |
| 194.50.210.0/23 | 512 | RIPE NCC | GB | 1st Sept 1993 |
| 194.50.212.0/23 | 512 | RIPE NCC |  NO | 23rd Oct 2019 |
| 194.50.217.0/24 | 256 | RIPE NCC | DE | 1st Sept 1993 |
| 194.50.220.0/23 | 512 | RIPE NCC | NO | 23rd Oct 2019 |
| 194.50.225.0/24 | 256 | RIPE NCC | DE | 1st Sept 1993 |
| 194.50.232.0/24 | 256 | RIPE NCC | CZ | 1st Sept 1993 |
| 194.50.242.0/24 | 256 | RIPE NCC | CZ | 1st Sept 1993 |
| 194.50.250.0/23 | 512 | RIPE NCC | GB | 23rd Oct 2019 |
| 194.50.26.0/23 | 512 | RIPE NCC | CZ | 1st Sept 1993 |
| 194.50.3.0/24 | 256 | RIPE NCC |  NL | 21st Nov 2019 |
| 194.50.34.0/24 | 256 | RIPE NCC | CH | 7th Mar 2006 |
| 194.50.41.0/24 | 256 | RIPE NCC | GB | 10th Mar 2006 |
| 194.50.52.0/24 | 256 | RIPE NCC |  IT | 21st Nov 2019 |
| 194.50.68.0/23 | 512 | RIPE NCC | DE | 21st Mar 2006 |
| 194.50.70.0/24 | 256 | RIPE NCC | DE | 21st Mar 2006 |
| 194.50.75.0/24 | 256 | RIPE NCC |  PL | 21st Mar 2006 |
| 194.50.77.0/24 | 256 | RIPE NCC |  QA | 12th May 2025 |
| 194.50.82.0/24 | 256 | RIPE NCC | IT | 21st Nov 2019 |
| 194.50.89.0/24 | 256 | RIPE NCC |  IL | 15th Apr 2026 |
| 194.53.108.0/22 | 1k | RIPE NCC | DE | 30th Jul 2018 |
| 194.53.113.0/24 | 256 | RIPE NCC | NL | 23rd Sept 1994 |
| 194.53.121.0/24 | 256 | RIPE NCC | GB | 18th Oct 1994 |
| 194.53.144.0/22 | 1k | RIPE NCC | NL | 21st Sept 2018 |
| 194.53.172.0/24 | 256 | RIPE NCC |  BE | 3rd Feb 1997 |