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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 193.8.251.0/24 | 256 | RIPE NCC |  CH | 1st Sept 1993 |
| 193.8.254.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 193.8.52.0/23 | 512 | RIPE NCC | CH | 1st Sept 1993 |
| 193.8.54.0/23 | 512 | RIPE NCC |  PL | 4th Oct 2019 |
| 193.8.62.0/23 | 512 | RIPE NCC |  AZ | 4th Oct 2019 |
| 193.8.9.0/24 | 256 | RIPE NCC |  FR | 1st Sept 1993 |
| 193.84.10.0/24 | 256 | RIPE NCC |  NO | 11th Sept 2023 |
| 193.84.176.0/24 | 256 | RIPE NCC |  NL | 17th Feb 2006 |
| 193.84.188.0/22 | 1k | RIPE NCC | NL | 3rd May 2018 |
| 193.84.224.0/20 | 4.1k | RIPE NCC |  GB | 14th Nov 1997 |
| 193.84.240.0/22 | 1k | RIPE NCC |  DE | 3rd May 2018 |
| 193.84.248.0/23 | 512 | RIPE NCC |  HK | 10th Oct 2019 |
| 193.84.250.0/24 | 256 | RIPE NCC | NL | 15th Nov 2019 |
| 193.84.27.0/24 | 256 | RIPE NCC |  DK | 7th Feb 2006 |
| 193.84.66.0/24 | 256 | RIPE NCC | DE | 13th Feb 2006 |
| 193.84.75.0/24 | 256 | RIPE NCC |  SE | 15th Feb 2006 |
| 193.84.79.0/24 | 256 | RIPE NCC | PL | 16th Feb 2006 |
| 193.84.84.0/24 | 256 | RIPE NCC |  IT | 23rd Jul 2025 |
| 193.84.95.0/24 | 256 | RIPE NCC | NL | 6th May 2026 |
| 193.9.0.0/24 | 256 | RIPE NCC | GB | 3rd Dec 2004 |
| 193.9.1.0/24 | 256 | RIPE NCC | GB | 1st Sept 1993 |
| 193.9.12.0/24 | 256 | RIPE NCC | SE | 1st Sept 1993 |
| 193.9.128.0/20 | 4.1k | RIPE NCC |  LU | 4th Nov 1992 |
| 193.9.13.0/24 | 256 | RIPE NCC | SE | 1st Sept 1993 |
| 193.9.148.0/22 | 1k | RIPE NCC | SE | 1st Sept 1993 |
| 193.9.152.0/22 | 1k | RIPE NCC |  RO | 24th Apr 2018 |
| 193.9.159.0/24 | 256 | RIPE NCC | DK | 21st Dec 2004 |
| 193.9.18.0/24 | 256 | RIPE NCC | IT | 24th Feb 2009 |
| 193.9.192.0/19 | 8.2k | RIPE NCC | DK | 1st Sept 1993 |
| 193.9.2.0/23 | 512 | RIPE NCC | GB | 1st Sept 1993 |
| 193.9.254.0/24 | 256 | RIPE NCC | DK | 1st Sept 1993 |
| 193.9.26.0/24 | 256 | RIPE NCC | GB | 14th May 2024 |
| 193.9.64.0/19 | 8.2k | RIPE NCC |  FI | 13th Nov 1992 |
| 193.9.96.0/20 | 4.1k | RIPE NCC | FI | 13th Nov 1992 |
| 193.91.0.0/24 | 256 | RIPE NCC |  ES | 24th Oct 1995 |
| 193.93.144.0/22 | 1k | RIPE NCC | PL | 6th Apr 2006 |
| 193.93.148.0/22 | 1k | RIPE NCC | GB | 6th Apr 2006 |
| 193.93.170.0/24 | 256 | RIPE NCC |  AE | 13th Feb 2026 |
| 193.93.182.0/24 | 256 | RIPE NCC |  IR | 5th Jul 2023 |
| 193.93.192.0/22 | 1k | RIPE NCC |  RU | 26th Mar 2010 |
| 193.93.61.0/24 | 256 | RIPE NCC | RU | 27th Feb 2006 |
| 193.93.62.0/24 | 256 | RIPE NCC |  LV | 27th Feb 2006 |
| 193.93.80.0/22 | 1k | RIPE NCC | GB | 3rd May 2018 |
| 193.96.226.0/24 | 256 | RIPE NCC | DE | 15th Feb 1994 |
| 193.98.104.0/22 | 1k | RIPE NCC | DE | 15th Feb 1994 |
| 193.98.108.0/23 | 512 | RIPE NCC | DE | 15th Feb 1994 |
| 193.98.128.0/20 | 4.1k | RIPE NCC | DE | 15th Feb 1994 |
| 193.98.235.0/24 | 256 | RIPE NCC | DE | 15th Feb 1994 |
| 193.98.44.0/22 | 1k | RIPE NCC | DE | 15th Feb 1994 |
| 193.98.96.0/21 | 2k | RIPE NCC | DE | 15th Feb 1994 |