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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through RIPE NCC, largest first.
Unannounced blocks registered through RIPE NCC
25,283 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 193.169.90.0/23 | 512 | RIPE NCC |  GB | 18th Jun 2009 |
| 193.17.128.0/19 | 8.2k | RIPE NCC | GB | 29th Jul 1992 |
| 193.17.160.0/21 | 2k | RIPE NCC | GB | 29th Jul 1992 |
| 193.17.168.0/23 | 512 | RIPE NCC | GB | 29th Jul 1992 |
| 193.17.17.0/24 | 256 | RIPE NCC |  DE | 29th Jul 1992 |
| 193.17.171.0/24 | 256 | RIPE NCC | DE | 21st Jan 2004 |
| 193.17.195.0/24 | 256 | RIPE NCC |  RO | 1st Oct 2004 |
| 193.17.198.0/24 | 256 | RIPE NCC | GB | 7th Oct 2004 |
| 193.17.201.0/24 | 256 | RIPE NCC |  CH | 8th Oct 2004 |
| 193.17.218.0/24 | 256 | RIPE NCC |  SE | 18th Oct 2004 |
| 193.17.220.0/24 | 256 | RIPE NCC |  HU | 13th Nov 2019 |
| 193.17.254.0/24 | 256 | RIPE NCC | DE | 2nd Dec 2003 |
| 193.17.34.0/24 | 256 | RIPE NCC |  FI | 7th Jan 2025 |
| 193.17.4.0/22 | 1k | RIPE NCC |  TR | 24th Apr 2018 |
| 193.17.52.0/24 | 256 | RIPE NCC |  RU | 15th Dec 2003 |
| 193.17.62.0/23 | 512 | RIPE NCC | DE | 16th Dec 1992 |
| 193.17.64.0/24 | 256 | RIPE NCC | CH | 13th Nov 2019 |
| 193.17.69.0/24 | 256 | RIPE NCC |  UA | 9th Jun 2004 |
| 193.17.71.0/24 | 256 | RIPE NCC |  PL | 14th Jun 2004 |
| 193.17.77.0/24 | 256 | RIPE NCC | DE | 15th Jun 2004 |
| 193.17.78.0/24 | 256 | RIPE NCC |  MD | 15th Jun 2004 |
| 193.17.88.0/24 | 256 | RIPE NCC |  CA | 14th Sept 2021 |
| 193.176.102.0/24 | 256 | RIPE NCC | HU | 12th Jul 2023 |
| 193.176.103.0/24 | 256 | RIPE NCC | HU | 17th Jul 2023 |
| 193.176.130.0/24 | 256 | RIPE NCC |  NL | 3rd Mar 1995 |
| 193.176.131.0/24 | 256 | RIPE NCC | NL | 3rd Mar 1995 |
| 193.176.148.0/22 | 1k | RIPE NCC | NL | 14th Apr 1993 |
| 193.176.152.0/24 | 256 | RIPE NCC | NL | 14th Apr 1993 |
| 193.176.153.0/24 | 256 | RIPE NCC | RU | 18th Nov 2019 |
| 193.176.158.0/24 | 256 | RIPE NCC | RU | 18th Nov 2019 |
| 193.176.179.0/24 | 256 | RIPE NCC | RU | 18th Nov 2019 |
| 193.176.188.0/23 | 512 | RIPE NCC | DE | 15th Apr 1993 |
| 193.176.190.0/24 | 256 | RIPE NCC | RU | 18th Nov 2019 |
| 193.176.218.0/23 | 512 | RIPE NCC | NL | 27th Jun 1993 |
| 193.176.226.0/24 | 256 | RIPE NCC | NL | 3rd May 1993 |
| 193.176.232.0/24 | 256 | RIPE NCC | GB | 5th Oct 2023 |
| 193.176.234.0/24 | 256 | RIPE NCC | NL | 13th Jul 1993 |
| 193.176.237.0/24 | 256 | RIPE NCC |  SC | 18th Nov 2019 |
| 193.176.24.0/22 | 1k | RIPE NCC | DE | 14th Sept 2018 |
| 193.176.255.0/24 | 256 | RIPE NCC | NL | 28th Nov 1994 |
| 193.176.3.0/24 | 256 | RIPE NCC | SE | 23rd Feb 1993 |
| 193.176.33.0/24 | 256 | RIPE NCC | GB | 6th Aug 2025 |
| 193.176.34.0/24 | 256 | RIPE NCC | NL | 6th Aug 2025 |
| 193.176.35.0/24 | 256 | RIPE NCC | RO | 6th Aug 2025 |
| 193.176.37.0/24 | 256 | RIPE NCC | PL | 6th Aug 2025 |
| 193.176.46.0/24 | 256 | RIPE NCC | NL | 18th Dec 1994 |
| 193.176.47.0/24 | 256 | RIPE NCC | FI | 29th Apr 1994 |
| 193.176.48.0/22 | 1k | RIPE NCC | NL | 14th Jun 1994 |
| 193.176.52.0/23 | 512 | RIPE NCC | NL | 14th Jun 1994 |
| 193.176.56.0/22 | 1k | RIPE NCC | GB | 23rd Feb 1993 |