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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in Switzerland
950 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 193.5.42.0/23 | 512 | RIPE NCC |  CH | 26th May 1997 |
| 193.5.52.0/24 | 256 | RIPE NCC | CH | 26th May 1997 |
| 193.5.63.0/24 | 256 | RIPE NCC | CH | 26th May 1997 |
| 193.5.66.0/23 | 512 | RIPE NCC | CH | 26th May 1997 |
| 193.5.70.0/23 | 512 | RIPE NCC | CH | 26th May 1997 |
| 193.5.72.0/22 | 1k | RIPE NCC | CH | 26th May 1997 |
| 193.5.8.0/23 | 512 | RIPE NCC | CH | 26th May 1997 |
| 193.57.104.0/24 | 256 | RIPE NCC | CH | 15th Nov 2019 |
| 193.57.140.0/24 | 256 | RIPE NCC | CH | 15th Nov 2019 |
| 193.58.136.0/21 | 2k | RIPE NCC | CH | 11th Jul 1994 |
| 193.58.209.0/24 | 256 | RIPE NCC | CH | 30th Sept 1997 |
| 193.58.239.0/24 | 256 | RIPE NCC | CH | 7th Apr 2005 |
| 193.73.238.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 193.73.251.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 193.8.142.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 193.8.165.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 193.8.193.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 193.8.198.0/23 | 512 | RIPE NCC | CH | 1st Sept 1993 |
| 193.8.200.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 193.8.230.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 193.8.248.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 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 |
| 194.0.172.0/24 | 256 | RIPE NCC | CH | 12th Jan 2007 |
| 194.0.198.0/24 | 256 | RIPE NCC | CH | 1st Feb 2007 |
| 194.1.190.0/24 | 256 | RIPE NCC | CH | 31st Mar 2010 |
| 194.11.0.0/20 | 4.1k | RIPE NCC | CH | 1st Sept 1993 |
| 194.11.112.0/20 | 4.1k | RIPE NCC | CH | 1st Sept 1993 |
| 194.11.204.0/23 | 512 | RIPE NCC | CH | 1st Sept 1993 |
| 194.11.240.0/23 | 512 | RIPE NCC | CH | 1st Sept 1993 |
| 194.11.30.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 194.11.31.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 194.11.88.0/21 | 2k | RIPE NCC | CH | 1st Sept 1993 |
| 194.11.96.0/20 | 4.1k | RIPE NCC | CH | 1st Sept 1993 |
| 194.110.128.0/24 | 256 | RIPE NCC | CH | 4th Apr 2007 |
| 194.117.50.64/26 | 64 | RIPE NCC | CH | 15th Jul 2025 |
| 194.117.78.0/24 | 256 | RIPE NCC | CH | 13th Oct 2025 |
| 194.117.90.0/24 | 256 | RIPE NCC | CH | 15th Oct 2025 |
| 194.124.0.0/19 | 8.2k | RIPE NCC | CH | 1st Sept 1993 |
| 194.124.212.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 194.124.238.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 194.124.242.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 194.124.243.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 194.124.246.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 194.124.253.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 194.146.16.0/22 | 1k | RIPE NCC | CH | 9th Jun 1995 |
| 194.146.20.0/23 | 512 | RIPE NCC | CH | 9th Jun 1995 |
| 194.146.22.0/24 | 256 | RIPE NCC | CH | 9th Jun 1995 |
| 194.147.143.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |