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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with unannounced space registered through RIPE NCC, largest first.
Unannounced blocks in Czechia
299 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 109.107.158.0/24 | 256 | RIPE NCC |  CZ | 22nd Oct 2021 |
| 153.76.176.0/23 | 512 | RIPE NCC | CZ | 23rd Sept 1991 |
| 153.76.180.0/22 | 1k | RIPE NCC | CZ | 23rd Sept 1991 |
| 153.76.184.0/21 | 2k | RIPE NCC | CZ | 23rd Sept 1991 |
| 171.25.176.0/24 | 256 | RIPE NCC | CZ | 12th Jan 2012 |
| 171.33.136.0/21 | 2k | RIPE NCC | CZ | 3rd Jul 2012 |
| 176.106.136.0/21 | 2k | RIPE NCC | CZ | 19th Apr 2012 |
| 176.107.120.0/21 | 2k | RIPE NCC | CZ | 31st Jan 2012 |
| 176.123.184.0/22 | 1k | RIPE NCC | CZ | 30th Jul 2012 |
| 176.97.201.0/24 | 256 | RIPE NCC | CZ | 22nd Oct 2021 |
| 185.0.20.0/23 | 512 | RIPE NCC | CZ | 20th Jan 2023 |
| 185.1.173.0/24 | 256 | RIPE NCC | CZ | 9th Jun 2020 |
| 185.1.25.0/24 | 256 | RIPE NCC | CZ | 30th Apr 2014 |
| 185.1.34.0/24 | 256 | RIPE NCC | CZ | 9th Dec 2014 |
| 185.1.83.0/24 | 256 | RIPE NCC | CZ | 31st Jan 2017 |
| 185.130.209.0/24 | 256 | RIPE NCC | CZ | 10th Dec 2015 |
| 185.130.210.0/23 | 512 | RIPE NCC | CZ | 10th Dec 2015 |
| 185.133.144.0/22 | 1k | RIPE NCC | CZ | 5th Jan 2016 |
| 185.139.218.0/23 | 512 | RIPE NCC | CZ | 22nd Feb 2016 |
| 185.144.176.0/22 | 1k | RIPE NCC | CZ | 29th Mar 2016 |
| 185.152.152.0/22 | 1k | RIPE NCC | CZ | 19th May 2016 |
| 185.153.72.0/22 | 1k | RIPE NCC | CZ | 23rd May 2016 |
| 185.153.80.0/22 | 1k | RIPE NCC | CZ | 23rd May 2016 |
| 185.159.132.0/22 | 1k | RIPE NCC | CZ | 14th Jul 2016 |
| 185.161.252.0/22 | 1k | RIPE NCC | CZ | 3rd Aug 2016 |
| 185.162.4.0/22 | 1k | RIPE NCC | CZ | 4th Aug 2016 |
| 185.167.64.0/22 | 1k | RIPE NCC | CZ | 9th Sept 2016 |
| 185.167.68.0/22 | 1k | RIPE NCC | CZ | 9th Sept 2016 |
| 185.170.240.0/22 | 1k | RIPE NCC | CZ | 3rd Oct 2016 |
| 185.174.92.0/22 | 1k | RIPE NCC | CZ | 24th Oct 2016 |
| 185.181.184.0/22 | 1k | RIPE NCC | CZ | 13th Dec 2016 |
| 185.181.56.0/22 | 1k | RIPE NCC | CZ | 8th Dec 2016 |
| 185.183.8.0/22 | 1k | RIPE NCC | CZ | 20th Dec 2016 |
| 185.187.140.0/22 | 1k | RIPE NCC | CZ | 27th Jan 2017 |
| 185.187.200.0/22 | 1k | RIPE NCC | CZ | 30th Jan 2017 |
| 185.188.184.0/22 | 1k | RIPE NCC | CZ | 23rd Feb 2018 |
| 185.190.89.0/24 | 256 | RIPE NCC | CZ | 16th Sept 2020 |
| 185.194.12.0/24 | 256 | RIPE NCC | CZ | 28th Sept 2020 |
| 185.207.168.0/22 | 1k | RIPE NCC | CZ | 9th Jun 2017 |
| 185.220.28.0/22 | 1k | RIPE NCC | CZ | 8th Sept 2017 |
| 185.255.240.0/22 | 1k | RIPE NCC | CZ | 16th Apr 2018 |
| 185.31.203.0/24 | 256 | RIPE NCC | CZ | 5th Dec 2023 |
| 185.38.188.0/22 | 1k | RIPE NCC | CZ | 24th Oct 2013 |
| 185.44.188.0/22 | 1k | RIPE NCC | CZ | 9th Jan 2014 |
| 185.48.7.0/24 | 256 | RIPE NCC | CZ | 11th Aug 2025 |
| 185.52.174.0/23 | 512 | RIPE NCC | CZ | 2nd Apr 2014 |
| 185.52.96.0/22 | 1k | RIPE NCC | CZ | 31st Mar 2014 |
| 185.54.0.0/23 | 512 | RIPE NCC | CZ | 15th Apr 2014 |
| 185.66.214.0/24 | 256 | RIPE NCC | CZ | 27th Jun 2024 |
| 185.78.56.0/22 | 1k | RIPE NCC | CZ | 21st Nov 2014 |