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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 194.53.173.0/24 | 256 | RIPE NCC |  NL | 15th Feb 1995 |
| 194.53.174.0/24 | 256 | RIPE NCC |  SA | 6th Aug 2025 |
| 194.53.184.0/22 | 1k | RIPE NCC |  RU | 21st Sept 2018 |
| 194.53.212.0/23 | 512 | RIPE NCC | NL | 24th Oct 1994 |
| 194.53.48.0/22 | 1k | RIPE NCC |  US | 30th Jul 2018 |
| 194.53.62.0/23 | 512 | RIPE NCC | NL | 29th Apr 1994 |
| 194.53.80.0/22 | 1k | RIPE NCC | NL | 29th Apr 1994 |
| 194.53.84.0/24 | 256 | RIPE NCC | NL | 22nd Jul 1994 |
| 194.53.96.0/21 | 2k | RIPE NCC | NL | 29th Apr 1994 |
| 194.54.128.0/22 | 1k | RIPE NCC |  RO | 22nd Jun 2004 |
| 194.54.132.0/22 | 1k | RIPE NCC | RU | 24th Jun 2004 |
| 194.54.156.0/24 | 256 | RIPE NCC |  MD | 8th Jul 2004 |
| 194.54.157.0/24 | 256 | RIPE NCC | MD | 8th Jul 2004 |
| 194.54.158.0/24 | 256 | RIPE NCC | MD | 8th Jul 2004 |
| 194.54.159.0/24 | 256 | RIPE NCC | MD | 8th Jul 2004 |
| 194.54.168.0/22 | 1k | RIPE NCC |  IL | 2nd Feb 2006 |
| 194.54.4.0/22 | 1k | RIPE NCC |  DE | 26th Oct 2005 |
| 194.54.68.0/24 | 256 | RIPE NCC |  SC | 20th Feb 2026 |
| 194.54.69.0/24 | 256 | RIPE NCC | DE | 4th Mar 2026 |
| 194.54.70.0/24 | 256 | RIPE NCC |  FR | 9th Mar 2026 |
| 194.54.71.0/24 | 256 | RIPE NCC |  TR | 9th Mar 2026 |
| 194.54.8.0/22 | 1k | RIPE NCC |  GB | 7th Nov 2005 |
| 194.55.130.0/23 | 512 | RIPE NCC | DE | 21st May 1994 |
| 194.55.134.0/23 | 512 | RIPE NCC | DE | 21st May 1994 |
| 194.55.139.0/24 | 256 | RIPE NCC | DE | 21st May 1994 |
| 194.55.160.0/24 | 256 | RIPE NCC | DE | 2nd Jun 1994 |
| 194.55.172.0/22 | 1k | RIPE NCC | DE | 13th Jun 1994 |
| 194.55.176.0/22 | 1k | RIPE NCC | DE | 13th Jun 1994 |
| 194.55.190.0/23 | 512 | RIPE NCC | DE | 16th Jun 1994 |
| 194.55.246.0/23 | 512 | RIPE NCC | DE | 21st Jun 1994 |
| 194.55.252.0/23 | 512 | RIPE NCC | DE | 20th Jun 1994 |
| 194.55.254.0/24 | 256 | RIPE NCC | DE | 21st Jun 1994 |
| 194.55.41.0/24 | 256 | RIPE NCC | DE | 26th Apr 1994 |
| 194.55.64.0/20 | 4.1k | RIPE NCC | DE | 5th May 1994 |
| 194.55.80.0/22 | 1k | RIPE NCC | RO | 18th May 2018 |
| 194.56.112.0/21 | 2k | RIPE NCC |  CH | 1st Sept 1993 |
| 194.56.120.0/22 | 1k | RIPE NCC | CH | 1st Sept 1993 |
| 194.56.144.0/22 | 1k | RIPE NCC |  LI | 1st Sept 1993 |
| 194.56.154.0/23 | 512 | RIPE NCC | CH | 1st Sept 1993 |
| 194.56.156.0/22 | 1k | RIPE NCC | CH | 1st Sept 1993 |
| 194.56.181.0/24 | 256 | RIPE NCC | DE | 8th Jan 2025 |
| 194.56.200.0/22 | 1k | RIPE NCC | CH | 1st Sept 1993 |
| 194.56.204.0/23 | 512 | RIPE NCC | CH | 1st Sept 1993 |
| 194.56.206.0/23 | 512 | RIPE NCC | CH | 1st Sept 1993 |
| 194.56.208.0/23 | 512 | RIPE NCC | CH | 1st Sept 1993 |
| 194.56.214.0/24 | 256 | RIPE NCC |  KG | 9th Dec 2024 |
| 194.56.220.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 194.56.228.0/23 | 512 | RIPE NCC | CH | 1st Sept 1993 |
| 194.56.231.0/24 | 256 | RIPE NCC | FR | 1st Sept 1993 |
| 194.56.241.0/24 | 256 | RIPE NCC | FR | 1st Sept 1993 |