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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 193.142.119.0/24 | 256 | RIPE NCC |  GB | 16th Mar 2007 |
| 193.142.120.0/24 | 256 | RIPE NCC |  FI | 2nd Aug 1993 |
| 193.142.126.0/24 | 256 | RIPE NCC | FI | 18th Nov 2019 |
| 193.142.136.0/21 | 2k | RIPE NCC | FI | 29th Jun 1994 |
| 193.142.160.0/20 | 4.1k | RIPE NCC |  SE | 29th Jun 1994 |
| 193.142.205.0/24 | 256 | RIPE NCC |  RO | 18th Nov 2019 |
| 193.142.215.0/24 | 256 | RIPE NCC |  NL | 23rd Mar 2007 |
| 193.142.220.0/24 | 256 | RIPE NCC | GB | 26th Mar 2007 |
| 193.142.223.0/24 | 256 | RIPE NCC | RO | 18th Nov 2019 |
| 193.142.232.0/23 | 512 | RIPE NCC |  IR | 11th Oct 2019 |
| 193.142.234.0/24 | 256 | RIPE NCC | RO | 18th Nov 2019 |
| 193.142.24.0/23 | 512 | RIPE NCC | FI | 3rd Jan 1995 |
| 193.142.240.0/24 | 256 | RIPE NCC | SE | 2nd Nov 1994 |
| 193.142.243.0/24 | 256 | RIPE NCC |  PL | 28th Mar 2007 |
| 193.142.245.0/24 | 256 | RIPE NCC |  MT | 17th Nov 2011 |
| 193.142.252.0/24 | 256 | RIPE NCC | FI | 13th May 1994 |
| 193.142.254.0/23 | 512 | RIPE NCC | IR | 11th Oct 2019 |
| 193.142.28.0/23 | 512 | RIPE NCC |  FR | 11th Oct 2019 |
| 193.142.33.0/24 | 256 | RIPE NCC |  TR | 8th Apr 2024 |
| 193.142.48.0/23 | 512 | RIPE NCC | FR | 11th Oct 2019 |
| 193.142.5.0/24 | 256 | RIPE NCC | FI | 30th Nov 1992 |
| 193.142.50.0/24 | 256 | RIPE NCC | FI | 1st Mar 1993 |
| 193.142.51.0/24 | 256 | RIPE NCC | FI | 16th Nov 1998 |
| 193.142.55.0/24 | 256 | RIPE NCC | FI | 16th Aug 1993 |
| 193.142.62.0/24 | 256 | RIPE NCC |  CH | 14th Mar 2007 |
| 193.142.7.0/24 | 256 | RIPE NCC | FI | 16th Feb 1993 |
| 193.142.8.0/21 | 2k | RIPE NCC | FI | 3rd Nov 1992 |
| 193.142.98.0/24 | 256 | RIPE NCC | FI | 10th Jun 1994 |
| 193.143.124.0/24 | 256 | RIPE NCC | FI | 2nd Nov 1994 |
| 193.143.136.0/22 | 1k | RIPE NCC | FI | 8th Sept 1993 |
| 193.143.140.0/23 | 512 | RIPE NCC | FI | 8th Sept 1993 |
| 193.143.142.0/23 | 512 | RIPE NCC | FI | 18th Sept 1995 |
| 193.143.144.0/20 | 4.1k | RIPE NCC | FI | 18th Sept 1995 |
| 193.143.161.0/24 | 256 | RIPE NCC | FI | 2nd Nov 1994 |
| 193.143.162.0/23 | 512 | RIPE NCC | FI | 2nd Nov 1994 |
| 193.143.164.0/22 | 1k | RIPE NCC | FI | 2nd Nov 1994 |
| 193.143.168.0/21 | 2k | RIPE NCC | FI | 2nd Nov 1994 |
| 193.143.176.0/20 | 4.1k | RIPE NCC | FI | 2nd Nov 1994 |
| 193.143.19.0/24 | 256 | RIPE NCC | FI | 15th Sept 1994 |
| 193.143.20.0/22 | 1k | RIPE NCC | NL | 7th May 2018 |
| 193.143.224.0/24 | 256 | RIPE NCC |  DE | 18th Nov 2019 |
| 193.143.225.0/24 | 256 | RIPE NCC | FI | 20th May 1994 |
| 193.143.228.0/24 | 256 | RIPE NCC | FI | 2nd Jun 1994 |
| 193.143.229.0/24 | 256 | RIPE NCC | GB | 2nd Jun 1994 |
| 193.143.254.0/24 | 256 | RIPE NCC | FI | 29th Aug 1994 |
| 193.143.90.0/24 | 256 | RIPE NCC | GB | 18th Nov 2019 |
| 193.143.98.0/24 | 256 | RIPE NCC | GB | 18th Nov 2019 |
| 193.148.1.0/24 | 256 | RIPE NCC |  CZ | 18th Nov 2019 |
| 193.148.15.0/24 | 256 | RIPE NCC |  RU | 29th Mar 2005 |
| 193.148.192.0/19 | 8.2k | RIPE NCC | CH | 1st Sept 1993 |