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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 193.163.0.0/24 | 256 | RIPE NCC |  DK | 10th Aug 1994 |
| 193.163.10.0/23 | 512 | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.103.0/24 | 256 | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.104.0/24 | 256 | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.109.0/24 | 256 | RIPE NCC |  BE | 16th Sept 2020 |
| 193.163.119.0/24 | 256 | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.120.0/23 | 512 | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.122.0/23 | 512 | RIPE NCC |  GB | 10th Aug 1994 |
| 193.163.129.0/24 | 256 | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.130.0/24 | 256 | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.146.0/23 | 512 | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.158.0/23 | 512 | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.171.0/24 | 256 | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.172.0/24 | 256 | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.173.0/24 | 256 | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.174.0/24 | 256 | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.176.0/23 | 512 | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.178.0/24 | 256 | RIPE NCC |  PL | 22nd Apr 2021 |
| 193.163.180.0/24 | 256 | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.183.0/24 | 256 | RIPE NCC |  FR | 22nd Feb 2021 |
| 193.163.188.0/23 | 512 | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.190.0/24 | 256 | RIPE NCC | GB | 21st Aug 2020 |
| 193.163.197.0/24 | 256 | RIPE NCC |  RU | 28th Sept 2021 |
| 193.163.216.0/22 | 1k | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.33.0/24 | 256 | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.50.0/23 | 512 | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.64.0/22 | 1k | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.68.0/24 | 256 | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.69.0/24 | 256 | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.73.0/24 | 256 | RIPE NCC |  IR | 16th Jun 2026 |
| 193.163.75.0/24 | 256 | RIPE NCC |  IL | 20th Aug 2020 |
| 193.163.9.0/24 | 256 | RIPE NCC | DK | 10th Aug 1994 |
| 193.163.94.0/24 | 256 | RIPE NCC | RU | 16th Sept 2021 |
| 193.164.1.0/24 | 256 | RIPE NCC |  LT | 18th Nov 2019 |
| 193.164.11.0/24 | 256 | RIPE NCC | GB | 18th Apr 2005 |
| 193.164.129.0/24 | 256 | RIPE NCC | PL | 15th Aug 2006 |
| 193.164.192.0/23 | 512 | RIPE NCC |  NL | 20th Aug 2009 |
| 193.164.194.0/23 | 512 | RIPE NCC | RU | 20th Aug 2009 |
| 193.164.199.0/24 | 256 | RIPE NCC |  SC | 10th Dec 2019 |
| 193.164.220.0/23 | 512 | RIPE NCC |  IE | 26th Aug 2009 |
| 193.164.226.0/23 | 512 | RIPE NCC |  ES | 8th Jun 2000 |
| 193.164.232.0/26 | 64 | RIPE NCC | FR | 26th Jun 2000 |
| 193.164.232.160/27 | 32 | RIPE NCC |  CY | 14th Sept 2012 |
| 193.164.232.192/27 | 32 | RIPE NCC | FR | 9th Mar 2006 |
| 193.164.232.64/27 | 32 | RIPE NCC | FR | 26th Jun 2000 |
| 193.164.233.0/24 | 256 | RIPE NCC | GB | 27th Jun 2000 |
| 193.164.234.0/23 | 512 | RIPE NCC |  AT | 6th Jul 2000 |
| 193.164.240.0/23 | 512 | RIPE NCC | AT | 6th Jul 2000 |
| 193.164.244.0/23 | 512 | RIPE NCC |  CH | 14th Jul 2000 |
| 193.164.32.0/19 | 8.2k | RIPE NCC |  CZ | 14th Mar 1996 |