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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,239 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 193.47.250.0/23 | 512 | RIPE NCC |  CH | 1st Sept 1993 |
| 193.47.252.0/23 | 512 | RIPE NCC | CH | 1st Sept 1993 |
| 193.47.254.0/24 | 256 | RIPE NCC |  NL | 14th Nov 2019 |
| 193.47.255.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 193.47.80.0/24 | 256 | RIPE NCC |  FR | 13th Jul 2005 |
| 193.47.84.0/24 | 256 | RIPE NCC |  DE | 27th Jan 2026 |
| 193.47.96.0/23 | 512 | RIPE NCC | CH | 1st Sept 1993 |
| 193.47.98.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 193.5.112.0/22 | 1k | RIPE NCC | CH | 26th May 1997 |
| 193.5.12.0/22 | 1k | RIPE NCC | CH | 26th May 1997 |
| 193.5.122.0/24 | 256 | RIPE NCC | CH | 26th May 1997 |
| 193.5.126.0/23 | 512 | RIPE NCC | CH | 26th May 1997 |
| 193.5.128.0/20 | 4.1k | RIPE NCC | NL | 26th May 1997 |
| 193.5.146.0/24 | 256 | RIPE NCC | DE | 1st Apr 2021 |
| 193.5.156.0/22 | 1k | RIPE NCC | CH | 26th May 1997 |
| 193.5.160.0/21 | 2k | RIPE NCC | CH | 26th May 1997 |
| 193.5.178.0/24 | 256 | RIPE NCC | CH | 26th May 1997 |
| 193.5.179.0/24 | 256 | RIPE NCC | CH | 26th May 1997 |
| 193.5.192.0/20 | 4.1k | RIPE NCC | CH | 26th May 1997 |
| 193.5.208.0/21 | 2k | RIPE NCC | CH | 26th May 1997 |
| 193.5.23.0/24 | 256 | RIPE NCC | CH | 26th May 1997 |
| 193.5.32.0/22 | 1k | RIPE NCC | CH | 26th May 1997 |
| 193.5.38.0/24 | 256 | RIPE NCC | CH | 26th May 1997 |
| 193.5.40.0/24 | 256 | RIPE NCC | CH | 26th May 1997 |
| 193.5.42.0/23 | 512 | RIPE NCC | CH | 26th May 1997 |
| 193.5.45.0/24 | 256 | RIPE NCC |  GB | 17th Feb 2025 |
| 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 |
| 193.53.1.0/24 | 256 | RIPE NCC | NL | 14th Nov 2019 |
| 193.53.102.0/24 | 256 | RIPE NCC |  BE | 18th Apr 1994 |
| 193.53.107.0/24 | 256 | RIPE NCC | DE | 18th Apr 1994 |
| 193.53.108.0/24 | 256 | RIPE NCC | DE | 18th Apr 1994 |
| 193.53.109.0/24 | 256 | RIPE NCC | DE | 18th Apr 1994 |
| 193.53.110.0/23 | 512 | RIPE NCC | DE | 18th Apr 1994 |
| 193.53.14.0/24 | 256 | RIPE NCC | BE | 18th Apr 1994 |
| 193.53.15.0/24 | 256 | RIPE NCC | BE | 18th Apr 1994 |
| 193.53.164.0/22 | 1k | RIPE NCC | GB | 17th Jul 2018 |
| 193.53.170.0/23 | 512 | RIPE NCC | BE | 18th Apr 1994 |
| 193.53.192.0/21 | 2k | RIPE NCC | BE | 18th Apr 1994 |
| 193.53.20.0/23 | 512 | RIPE NCC | BE | 18th Apr 1994 |
| 193.53.240.0/22 | 1k | RIPE NCC | BE | 18th Apr 1994 |
| 193.53.244.0/24 | 256 | RIPE NCC | BE | 18th Apr 1994 |
| 193.53.32.0/23 | 512 | RIPE NCC |  SE | 18th Apr 1994 |
| 193.53.35.0/24 | 256 | RIPE NCC | SE | 14th Nov 2019 |
| 193.53.38.0/24 | 256 | RIPE NCC | FR | 18th Apr 1994 |
| 193.53.39.0/24 | 256 | RIPE NCC | BE | 18th Apr 1994 |