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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,221 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 193.164.64.0/20 | 4.1k | RIPE NCC |  CZ | 14th Mar 1996 |
| 193.168.132.0/22 | 1k | RIPE NCC |  IT | 11th Dec 2018 |
| 193.168.16.0/20 | 4.1k | RIPE NCC |  LU | 26th Nov 1992 |
| 193.168.165.0/24 | 256 | RIPE NCC |  CH | 5th May 2026 |
| 193.168.167.0/24 | 256 | RIPE NCC |  GB | 5th May 2026 |
| 193.168.180.0/22 | 1k | RIPE NCC |  BZ | 11th Dec 2018 |
| 193.168.2.0/24 | 256 | RIPE NCC | LU | 11th Nov 1994 |
| 193.168.217.0/24 | 256 | RIPE NCC |  RU | 6th May 2021 |
| 193.168.244.0/22 | 1k | RIPE NCC | CZ | 12th Dec 2018 |
| 193.169.10.0/23 | 512 | RIPE NCC |  DE | 8th May 2009 |
| 193.169.120.0/23 | 512 | RIPE NCC | GB | 1st Jul 2009 |
| 193.169.140.0/23 | 512 | RIPE NCC | GB | 14th Jul 2009 |
| 193.169.152.0/23 | 512 | RIPE NCC | CH | 20th Jul 2009 |
| 193.169.194.0/23 | 512 | RIPE NCC |  LV | 28th Jul 2009 |
| 193.169.198.0/23 | 512 | RIPE NCC |  BG | 30th Jul 2009 |
| 193.169.234.0/23 | 512 | RIPE NCC |  NL | 31st Mar 2011 |
| 193.169.236.0/23 | 512 | RIPE NCC | GB | 14th Jan 2011 |
| 193.169.242.0/23 | 512 | RIPE NCC | IT | 13th Aug 2009 |
| 193.169.252.0/22 | 1k | RIPE NCC |  PL | 8th May 2018 |
| 193.169.31.0/24 | 256 | RIPE NCC | BG | 22nd May 2009 |
| 193.169.58.0/24 | 256 | RIPE NCC | IT | 12th Sept 2022 |
| 193.169.84.0/23 | 512 | RIPE NCC |  FI | 18th Jun 2009 |
| 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 |
| 193.17.215.0/24 | 256 | AFRINIC |  CI | 28th Feb 2020 |
| 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 |