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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 193.228.159.0/24 | 256 | RIPE NCC |  RU | 20th Jul 2007 |
| 193.228.170.0/23 | 512 | RIPE NCC |  AT | 27th Jun 1995 |
| 193.228.172.0/23 | 512 | RIPE NCC |  BG | 16th Oct 2019 |
| 193.228.182.0/23 | 512 | RIPE NCC | BG | 16th Oct 2019 |
| 193.228.187.0/24 | 256 | RIPE NCC |  DE | 18th Sept 1995 |
| 193.228.192.0/24 | 256 | RIPE NCC | AT | 26th Sept 1995 |
| 193.228.203.0/24 | 256 | RIPE NCC | AT | 9th Nov 1995 |
| 193.228.207.0/24 | 256 | RIPE NCC | AT | 14th Nov 1995 |
| 193.228.240.0/20 | 4.1k | RIPE NCC | DE | 19th Dec 1995 |
| 193.228.63.0/24 | 256 | RIPE NCC | AT | 20th Apr 1995 |
| 193.228.64.0/21 | 2k | RIPE NCC | AT | 13th Apr 1995 |
| 193.228.88.0/23 | 512 | RIPE NCC | AT | 2nd May 1995 |
| 193.228.92.0/24 | 256 | RIPE NCC | AT | 8th May 1995 |
| 193.23.120.0/24 | 256 | RIPE NCC |  US | 29th Jun 2004 |
| 193.23.136.0/24 | 256 | RIPE NCC |  TR | 28th Apr 2026 |
| 193.23.140.0/24 | 256 | RIPE NCC |  UA | 19th Feb 2009 |
| 193.23.158.0/24 | 256 | RIPE NCC |  PL | 11th Jul 2024 |
| 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 |