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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 193.3.170.0/24 | 256 | RIPE NCC |  SC | 27th Oct 2021 |
| 193.3.190.0/24 | 256 | RIPE NCC |  FR | 28th Oct 2021 |
| 193.3.228.0/24 | 256 | RIPE NCC |  DK | 1st Sept 1993 |
| 193.3.229.0/24 | 256 | RIPE NCC | DK | 1st Sept 1993 |
| 193.3.247.0/24 | 256 | RIPE NCC | DK | 1st Sept 1993 |
| 193.3.248.0/22 | 1k | RIPE NCC | DK | 1st Sept 1993 |
| 193.3.25.0/24 | 256 | RIPE NCC | DK | 1st Sept 1993 |
| 193.3.26.0/24 | 256 | RIPE NCC |  GB | 17th May 2021 |
| 193.3.36.0/24 | 256 | RIPE NCC | DK | 1st Sept 1993 |
| 193.3.43.0/24 | 256 | RIPE NCC | GB | 1st Sept 1993 |
| 193.3.46.0/24 | 256 | RIPE NCC | GB | 3rd Sept 2020 |
| 193.3.47.0/24 | 256 | RIPE NCC | DK | 1st Sept 1993 |
| 193.3.54.0/24 | 256 | RIPE NCC |  US | 25th Mar 2021 |
| 193.3.63.0/24 | 256 | RIPE NCC |  BG | 2nd Sept 2020 |
| 193.30.108.0/24 | 256 | RIPE NCC |  RU | 23rd Mar 2022 |
| 193.30.142.0/24 | 256 | RIPE NCC |  SE | 8th Jan 2004 |
| 193.30.143.0/24 | 256 | RIPE NCC | DK | 8th Jan 2004 |
| 193.30.144.0/20 | 4.1k | RIPE NCC | FR | 21st Sept 1993 |
| 193.30.16.0/23 | 512 | RIPE NCC |  DE | 21st Sept 1993 |
| 193.30.176.0/20 | 4.1k | RIPE NCC | DE | 21st Sept 1993 |
| 193.30.232.0/22 | 1k | RIPE NCC | GB | 3rd Feb 2004 |
| 193.30.28.0/24 | 256 | RIPE NCC |  RO | 7th May 2012 |
| 193.30.31.0/24 | 256 | RIPE NCC |  ES | 10th Nov 2020 |
| 193.30.4.0/24 | 256 | RIPE NCC | DE | 21st Sept 1993 |
| 193.30.88.0/24 | 256 | ARIN | US | 19th Apr 2022 |
| 193.30.89.0/24 | 256 | RIPE NCC | DE | 21st Sept 1993 |
| 193.31.10.0/23 | 512 | RIPE NCC | DE | 9th Nov 1993 |
| 193.31.118.0/24 | 256 | RIPE NCC |  TR | 18th Oct 2018 |
| 193.31.12.0/24 | 256 | RIPE NCC |  CA | 7th Oct 2019 |
| 193.31.128.0/19 | 8.2k | RIPE NCC | DE | 9th Nov 1993 |
| 193.31.13.0/24 | 256 | RIPE NCC | SC | 7th Oct 2019 |
| 193.31.15.0/24 | 256 | RIPE NCC |  LT | 14th Nov 2019 |
| 193.31.20.0/22 | 1k | RIPE NCC | DE | 26th Apr 2018 |
| 193.31.224.0/20 | 4.1k | RIPE NCC | DE | 9th Nov 1993 |
| 193.31.254.0/23 | 512 | RIPE NCC |  HU | 7th Oct 2019 |
| 193.31.44.0/22 | 1k | RIPE NCC | DE | 10th Sept 2018 |
| 193.31.80.0/20 | 4.1k | RIPE NCC | DE | 9th Nov 1993 |
| 193.32.106.0/23 | 512 | RIPE NCC | GB | 21st Oct 1992 |
| 193.32.108.0/23 | 512 | RIPE NCC | GB | 21st Oct 1992 |
| 193.32.111.0/24 | 256 | RIPE NCC | GB | 21st Oct 1992 |
| 193.32.118.0/23 | 512 | RIPE NCC | US | 21st Oct 1992 |
| 193.32.120.0/22 | 1k | RIPE NCC | US | 21st Oct 1992 |
| 193.32.124.0/23 | 512 | RIPE NCC | US | 21st Oct 1992 |
| 193.32.144.0/22 | 1k | RIPE NCC |  CH | 27th Nov 2018 |
| 193.32.17.0/24 | 256 | RIPE NCC | GB | 21st Aug 1992 |
| 193.32.19.0/24 | 256 | RIPE NCC |  NL | 3rd Oct 2006 |
| 193.32.196.0/23 | 512 | RIPE NCC | RU | 18th Oct 2018 |
| 193.32.200.0/23 | 512 | RIPE NCC | RU | 18th Oct 2018 |
| 193.32.24.0/22 | 1k | RIPE NCC | GB | 21st Aug 1992 |
| 193.32.250.0/23 | 512 | RIPE NCC | GB | 27th Nov 1992 |