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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 193.223.170.0/24 | 256 | RIPE NCC |  CH | 1st Sept 1993 |
| 193.223.171.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 193.223.172.0/22 | 1k | RIPE NCC | CH | 1st Sept 1993 |
| 193.223.2.0/23 | 512 | RIPE NCC | CH | 1st Sept 1993 |
| 193.223.4.0/22 | 1k | RIPE NCC | CH | 1st Sept 1993 |
| 193.223.8.0/21 | 2k | RIPE NCC | CH | 1st Sept 1993 |
| 193.227.101.0/24 | 256 | RIPE NCC | CH | 30th Aug 2006 |
| 193.227.224.0/23 | 512 | RIPE NCC | CH | 3rd Oct 2005 |
| 193.227.226.0/24 | 256 | RIPE NCC | CH | 13th Jul 2026 |
| 193.23.255.0/24 | 256 | RIPE NCC | CH | 7th Nov 2003 |
| 193.24.26.0/24 | 256 | RIPE NCC | CH | 9th Mar 2004 |
| 193.242.220.0/24 | 256 | RIPE NCC | CH | 15th Apr 2024 |
| 193.246.101.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.246.108.0/23 | 512 | RIPE NCC | CH | 28th May 1997 |
| 193.246.120.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.246.123.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.246.128.0/20 | 4.1k | RIPE NCC | CH | 28th May 1997 |
| 193.246.145.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.246.151.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.246.152.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.246.158.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.246.163.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.246.166.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.246.168.0/23 | 512 | RIPE NCC | CH | 28th May 1997 |
| 193.246.172.0/23 | 512 | RIPE NCC | CH | 28th May 1997 |
| 193.246.202.0/23 | 512 | RIPE NCC | CH | 28th May 1997 |
| 193.246.204.0/23 | 512 | RIPE NCC | CH | 28th May 1997 |
| 193.246.208.0/20 | 4.1k | RIPE NCC | CH | 28th May 1997 |
| 193.246.242.0/23 | 512 | RIPE NCC | CH | 28th May 1997 |
| 193.246.246.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.246.252.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.246.254.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.246.6.0/23 | 512 | RIPE NCC | CH | 28th May 1997 |
| 193.246.60.0/23 | 512 | RIPE NCC | CH | 28th May 1997 |
| 193.246.62.0/23 | 512 | RIPE NCC | CH | 28th May 1997 |
| 193.247.104.0/23 | 512 | RIPE NCC | CH | 28th May 1997 |
| 193.247.106.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.247.145.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.247.152.0/21 | 2k | RIPE NCC | CH | 28th May 1997 |
| 193.247.160.0/23 | 512 | RIPE NCC | CH | 28th May 1997 |
| 193.247.163.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.247.164.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.247.166.0/23 | 512 | RIPE NCC | CH | 28th May 1997 |
| 193.247.186.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.247.187.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.247.188.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.247.201.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.247.204.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.247.206.0/23 | 512 | RIPE NCC | CH | 28th May 1997 |
| 193.247.218.0/23 | 512 | RIPE NCC | CH | 28th May 1997 |