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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 193.23.162.0/24 | 256 | RIPE NCC |  DE | 29th Jul 1992 |
| 193.23.166.0/24 | 256 | RIPE NCC |  ES | 13th Nov 2019 |
| 193.23.172.0/24 | 256 | RIPE NCC |  SC | 17th Mar 2025 |
| 193.23.173.0/24 | 256 | RIPE NCC | ES | 13th Nov 2019 |
| 193.23.183.0/24 | 256 | RIPE NCC |  UA | 19th Dec 2003 |
| 193.23.232.0/21 | 2k | RIPE NCC | DE | 29th Jul 1992 |
| 193.23.240.0/23 | 512 | RIPE NCC | DE | 29th Jul 1992 |
| 193.23.242.0/24 | 256 | RIPE NCC | ES | 13th Nov 2019 |
| 193.23.245.0/24 | 256 | RIPE NCC | SC | 13th Nov 2019 |
| 193.23.252.0/24 | 256 | RIPE NCC | DE | 29th Jul 1992 |
| 193.23.255.0/24 | 256 | RIPE NCC |  CH | 7th Nov 2003 |
| 193.23.3.0/24 | 256 | RIPE NCC |  RU | 13th Nov 2019 |
| 193.23.8.0/21 | 2k | RIPE NCC | DE | 29th Jul 1992 |
| 193.232.135.0/24 | 256 | RIPE NCC | RU | 9th Jun 1993 |
| 193.232.136.0/24 | 256 | RIPE NCC | RU | 9th Jun 1993 |
| 193.232.181.0/24 | 256 | RIPE NCC | RU | 9th Jun 1993 |
| 193.232.190.0/23 | 512 | RIPE NCC | RU | 9th Jun 1993 |
| 193.232.232.0/23 | 512 | RIPE NCC | RU | 9th Jun 1993 |
| 193.232.242.0/24 | 256 | RIPE NCC | RU | 9th Jun 1993 |
| 193.232.244.0/24 | 256 | RIPE NCC | RU | 9th Jun 1993 |
| 193.232.71.0/24 | 256 | RIPE NCC | RU | 9th Jun 1993 |
| 193.232.76.0/24 | 256 | RIPE NCC | RU | 9th Jun 1993 |
| 193.232.78.0/24 | 256 | RIPE NCC | RU | 9th Jun 1993 |
| 193.232.87.0/24 | 256 | RIPE NCC | RU | 9th Jun 1993 |
| 193.232.92.0/24 | 256 | RIPE NCC | RU | 9th Jun 1993 |
| 193.236.144.0/21 | 2k | RIPE NCC |  PT | 15th Mar 1995 |
| 193.236.176.0/23 | 512 | RIPE NCC | PT | 15th Mar 1995 |
| 193.238.112.0/22 | 1k | RIPE NCC |  GR | 10th Mar 2005 |
| 193.238.116.0/24 | 256 | RIPE NCC | RU | 11th Mar 2005 |
| 193.238.161.0/24 | 256 | RIPE NCC |  NL | 6th Apr 2005 |
| 193.238.184.0/24 | 256 | RIPE NCC |  DK | 18th Apr 2005 |
| 193.238.185.0/24 | 256 | RIPE NCC | DK | 18th Apr 2005 |
| 193.238.186.0/23 | 512 | RIPE NCC | DK | 18th Apr 2005 |
| 193.238.40.0/22 | 1k | RIPE NCC |  PL | 17th Feb 2005 |
| 193.238.45.0/24 | 256 | RIPE NCC | RU | 11th May 2018 |
| 193.238.96.0/22 | 1k | RIPE NCC | UA | 4th Mar 2005 |
| 193.239.112.0/22 | 1k | RIPE NCC |  GB | 4th Jul 2005 |
| 193.239.116.0/22 | 1k | RIPE NCC | NL | 11th Jul 2005 |
| 193.239.138.0/23 | 512 | RIPE NCC |  RO | 8th Apr 2008 |
| 193.239.148.0/23 | 512 | RIPE NCC |  HU | 8th Jun 2005 |
| 193.239.156.0/23 | 512 | RIPE NCC | DE | 10th Jun 2005 |
| 193.239.196.0/24 | 256 | RIPE NCC | ES | 17th Oct 2019 |
| 193.239.224.0/23 | 512 | RIPE NCC | PL | 13th Jul 2005 |
| 193.239.229.0/24 | 256 | RIPE NCC | RU | 27th Nov 2024 |
| 193.239.250.0/23 | 512 | RIPE NCC | UA | 2nd Aug 2005 |
| 193.24.103.0/24 | 256 | RIPE NCC |  IR | 2nd Jul 2024 |
| 193.24.104.0/24 | 256 | RIPE NCC | GR | 2nd Jul 2024 |
| 193.24.112.0/24 | 256 | RIPE NCC | NL | 2nd Jul 2024 |
| 193.24.113.0/24 | 256 | RIPE NCC | GB | 2nd Jul 2024 |
| 193.24.115.0/24 | 256 | RIPE NCC |  SE | 2nd Jul 2024 |