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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through RIPE NCC, largest first.
Unannounced blocks registered through RIPE NCC
25,283 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 193.148.247.0/24 | 256 | RIPE NCC | GB | 18th Nov 2019 |
| 193.148.4.0/24 | 256 | RIPE NCC |  ES | 1st Sept 1993 |
| 193.148.5.0/24 | 256 | RIPE NCC | CZ | 18th Nov 2019 |
| 193.148.6.0/23 | 512 | RIPE NCC |  FR | 5th Dec 2011 |
| 193.148.68.0/22 | 1k | RIPE NCC | DE | 24th Oct 2018 |
| 193.148.72.0/22 | 1k | RIPE NCC | DE | 24th Oct 2018 |
| 193.148.76.0/22 | 1k | RIPE NCC |  EE | 24th Oct 2018 |
| 193.149.128.0/24 | 256 | RIPE NCC |  DK | 24th Jan 1996 |
| 193.149.131.0/24 | 256 | RIPE NCC | NL | 24th Jan 1996 |
| 193.149.132.0/23 | 512 | RIPE NCC | NL | 24th Jan 1996 |
| 193.149.137.0/24 | 256 | RIPE NCC | DK | 24th Jan 1996 |
| 193.149.138.0/24 | 256 | RIPE NCC | DK | 24th Jan 1996 |
| 193.149.140.0/23 | 512 | RIPE NCC | DK | 24th Jan 1996 |
| 193.149.143.0/24 | 256 | RIPE NCC | NL | 24th Jan 1996 |
| 193.149.144.0/24 | 256 | RIPE NCC | NL | 24th Jan 1996 |
| 193.149.146.0/23 | 512 | RIPE NCC | DK | 24th Jan 1996 |
| 193.149.150.0/24 | 256 | RIPE NCC | DK | 24th Jan 1996 |
| 193.149.152.0/24 | 256 | RIPE NCC | DK | 24th Jan 1996 |
| 193.149.154.0/24 | 256 | RIPE NCC | DK | 24th Jan 1996 |
| 193.149.157.0/24 | 256 | RIPE NCC | NL | 24th Jan 1996 |
| 193.149.160.0/22 | 1k | RIPE NCC |  AT | 24th Jan 1996 |