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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 194.127.231.0/24 | 256 | RIPE NCC |  FR | 2nd Mar 1995 |
| 194.127.233.0/24 | 256 | RIPE NCC |  DE | 2nd Mar 1995 |
| 194.127.234.0/23 | 512 | RIPE NCC | FR | 31st Oct 2019 |
| 194.127.236.0/23 | 512 | RIPE NCC | FR | 31st Oct 2019 |
| 194.127.238.0/23 | 512 | RIPE NCC | DE | 2nd Mar 1995 |
| 194.127.252.0/23 | 512 | RIPE NCC | FR | 31st Oct 2019 |
| 194.13.0.0/24 | 256 | RIPE NCC |  BE | 10th Oct 1995 |
| 194.13.128.0/22 | 1k | RIPE NCC |  NL | 27th Dec 1993 |
| 194.13.132.0/24 | 256 | RIPE NCC | NL | 27th Dec 1993 |
| 194.13.143.0/24 | 256 | RIPE NCC |  RU | 5th Oct 2023 |
| 194.13.15.0/24 | 256 | RIPE NCC | FR | 26th May 1994 |
| 194.13.192.0/20 | 4.1k | RIPE NCC | NL | 10th Jan 1994 |
| 194.13.2.0/23 | 512 | RIPE NCC |  GB | 7th Apr 1994 |
| 194.13.208.0/20 | 4.1k | RIPE NCC | NL | 10th Jan 1994 |
| 194.13.232.0/22 | 1k | RIPE NCC | DE | 14th May 2018 |
| 194.13.240.0/20 | 4.1k | RIPE NCC | NL | 2nd Feb 1994 |
| 194.13.32.0/19 | 8.2k | RIPE NCC | NL | 8th Apr 1994 |
| 194.13.65.0/24 | 256 | RIPE NCC | DE | 3rd Mar 1994 |
| 194.13.88.0/21 | 2k | RIPE NCC | NL | 24th Feb 1994 |
| 194.13.96.0/21 | 2k | RIPE NCC | NL | 24th Feb 1994 |
| 194.135.106.0/23 | 512 | RIPE NCC |  SY | 6th Feb 1995 |
| 194.135.116.0/23 | 512 | RIPE NCC | SY | 6th Feb 1995 |
| 194.135.21.0/24 | 256 | RIPE NCC | RU | 6th Feb 1995 |
| 194.135.248.0/21 | 2k | RIPE NCC | SY | 6th Feb 1995 |
| 194.140.236.0/24 | 256 | RIPE NCC |  DK | 19th Jun 2006 |
| 194.140.240.0/24 | 256 | RIPE NCC |  SE | 20th Jun 2006 |
| 194.140.244.0/24 | 256 | RIPE NCC | SE | 21st Jun 2006 |
| 194.143.138.0/23 | 512 | RIPE NCC | RU | 10th Mar 2005 |
| 194.143.152.0/23 | 512 | RIPE NCC |  LV | 17th Mar 2005 |
| 194.143.158.0/23 | 512 | RIPE NCC | GB | 21st Mar 2005 |
| 194.145.112.0/23 | 512 | RIPE NCC | FR | 31st Oct 2019 |
| 194.145.120.0/24 | 256 | RIPE NCC |  RO | 1st Nov 2004 |
| 194.145.126.0/24 | 256 | RIPE NCC |  GG | 24th Oct 2008 |
| 194.145.142.0/23 | 512 | RIPE NCC |  AT | 31st Oct 2019 |
| 194.145.144.0/24 | 256 | RIPE NCC | FR | 28th Jul 1999 |
| 194.145.145.0/24 | 256 | RIPE NCC | SE | 5th Aug 1999 |
| 194.145.148.0/23 | 512 | RIPE NCC | GB | 27th Aug 1999 |
| 194.145.154.0/24 | 256 | RIPE NCC | GB | 2nd Nov 2004 |
| 194.145.160.0/22 | 1k | RIPE NCC |  BG | 24th Aug 2004 |
| 194.145.192.0/23 | 512 | RIPE NCC | DE | 18th Mar 2005 |
| 194.145.196.0/23 | 512 | RIPE NCC | AT | 31st Oct 2019 |
| 194.145.204.0/23 | 512 | RIPE NCC |  PL | 30th Mar 2005 |
| 194.145.210.0/23 | 512 | RIPE NCC | FR | 31st Oct 2019 |
| 194.145.212.0/23 | 512 | RIPE NCC | FR | 31st Oct 2019 |
| 194.145.228.0/24 | 256 | RIPE NCC | PL | 9th Nov 2004 |
| 194.145.252.0/22 | 1k | RIPE NCC | DE | 24th Mar 1999 |
| 194.145.59.0/24 | 256 | RIPE NCC | DE | 2nd Jun 1998 |
| 194.145.60.0/23 | 512 | RIPE NCC | DE | 2nd Jun 1998 |
| 194.145.62.0/24 | 256 | RIPE NCC | DE | 2nd Jun 1998 |
| 194.146.100.0/22 | 1k | RIPE NCC |  IT | 29th May 2018 |