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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 193.176.152.0/24 | 256 | RIPE NCC |  NL | 14th Apr 1993 |
| 193.176.153.0/24 | 256 | RIPE NCC |  RU | 18th Nov 2019 |
| 193.176.158.0/24 | 256 | RIPE NCC | RU | 18th Nov 2019 |
| 193.176.179.0/24 | 256 | RIPE NCC | RU | 18th Nov 2019 |
| 193.176.188.0/23 | 512 | RIPE NCC |  DE | 15th Apr 1993 |
| 193.176.190.0/24 | 256 | RIPE NCC | RU | 18th Nov 2019 |
| 193.176.218.0/23 | 512 | RIPE NCC | NL | 27th Jun 1993 |
| 193.176.226.0/24 | 256 | RIPE NCC | NL | 3rd May 1993 |
| 193.176.232.0/24 | 256 | RIPE NCC |  GB | 5th Oct 2023 |
| 193.176.234.0/24 | 256 | RIPE NCC | NL | 13th Jul 1993 |
| 193.176.237.0/24 | 256 | RIPE NCC |  SC | 18th Nov 2019 |
| 193.176.24.0/22 | 1k | RIPE NCC | DE | 14th Sept 2018 |
| 193.176.255.0/24 | 256 | RIPE NCC | NL | 28th Nov 1994 |
| 193.176.3.0/24 | 256 | RIPE NCC |  SE | 23rd Feb 1993 |
| 193.176.33.0/24 | 256 | RIPE NCC | GB | 6th Aug 2025 |
| 193.176.34.0/24 | 256 | RIPE NCC | NL | 6th Aug 2025 |
| 193.176.35.0/24 | 256 | RIPE NCC |  RO | 6th Aug 2025 |
| 193.176.37.0/24 | 256 | RIPE NCC |  PL | 6th Aug 2025 |
| 193.176.46.0/24 | 256 | RIPE NCC | NL | 18th Dec 1994 |
| 193.176.47.0/24 | 256 | RIPE NCC |  FI | 29th Apr 1994 |
| 193.176.48.0/22 | 1k | RIPE NCC | NL | 14th Jun 1994 |
| 193.176.52.0/23 | 512 | RIPE NCC | NL | 14th Jun 1994 |
| 193.176.56.0/22 | 1k | RIPE NCC | GB | 23rd Feb 1993 |
| 193.176.60.0/24 | 256 | RIPE NCC | GB | 23rd Feb 1993 |
| 193.176.63.0/24 | 256 | RIPE NCC | NL | 8th Dec 1993 |
| 193.177.0.0/24 | 256 | RIPE NCC |  FR | 18th Nov 2019 |
| 193.177.1.0/24 | 256 | RIPE NCC | NL | 3rd May 1993 |
| 193.177.136.0/22 | 1k | RIPE NCC | GB | 11th Oct 1993 |
| 193.177.148.0/22 | 1k | RIPE NCC | DE | 15th Apr 1993 |
| 193.177.152.0/21 | 2k | RIPE NCC | NL | 27th Jun 1993 |
| 193.177.16.0/20 | 4.1k | RIPE NCC | NL | 3rd May 1993 |
| 193.177.167.0/24 | 256 | RIPE NCC | NL | 9th Aug 1995 |
| 193.177.183.0/24 | 256 | RIPE NCC | NL | 8th Dec 1993 |
| 193.177.184.0/22 | 1k | RIPE NCC | NL | 4th Aug 1993 |
| 193.177.2.0/23 | 512 | RIPE NCC | NL | 3rd May 1993 |
| 193.177.216.0/22 | 1k | RIPE NCC |  AT | 17th Sept 2018 |
| 193.177.224.0/21 | 2k | RIPE NCC | NL | 2nd Nov 1993 |
| 193.177.243.0/24 | 256 | RIPE NCC |  BE | 4th Aug 2025 |
| 193.177.244.0/24 | 256 | RIPE NCC |  TR | 4th Aug 2025 |
| 193.177.245.0/24 | 256 | RIPE NCC |  IR | 5th Aug 2025 |
| 193.177.248.0/21 | 2k | RIPE NCC | NL | 30th Oct 1995 |
| 193.177.32.0/19 | 8.2k | RIPE NCC | NL | 3rd May 1993 |
| 193.177.4.0/22 | 1k | RIPE NCC | NL | 3rd May 1993 |
| 193.177.64.0/18 | 16.4k | RIPE NCC | NL | 3rd May 1993 |
| 193.177.8.0/21 | 2k | RIPE NCC | NL | 3rd May 1993 |
| 193.178.115.0/24 | 256 | RIPE NCC |  ES | 18th Nov 2019 |
| 193.178.116.0/24 | 256 | RIPE NCC | GB | 21st Apr 1995 |
| 193.178.117.0/24 | 256 | RIPE NCC | PL | 30th Mar 2005 |
| 193.178.133.0/24 | 256 | RIPE NCC | FI | 6th Feb 2001 |
| 193.178.140.0/24 | 256 | RIPE NCC | FR | 12th Feb 2001 |