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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
84,960 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 45.255.56.0/22 | 1k | APNIC |  CN | 7th Jun 2016 |
| 45.255.60.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.64.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.68.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.72.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.76.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.8.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.80.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.84.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.88.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.92.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.96.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.3.60.0/23 | 512 | RIPE NCC |  CH | 2nd Sept 2015 |
| 45.33.194.0/24 | 256 | ARIN |  US | 19th Nov 2020 |
| 45.33.197.0/24 | 256 | ARIN | US | 5th Mar 2019 |
| 45.34.0.0/15 | 131k | ARIN | US | 6th Dec 2023 |
| 45.4.168.0/22 | 1k | LACNIC |  CL | 17th Mar 2017 |
| 45.40.16.0/20 | 4.1k | ARIN | US | 26th Feb 2015 |
| 45.41.194.0/24 | 256 | ARIN | US | 9th Jul 2021 |
| 45.41.195.0/24 | 256 | ARIN | US | 29th Jul 2021 |
| 45.41.20.0/22 | 1k | ARIN | US | 8th Jul 2021 |
| 45.41.248.0/22 | 1k | ARIN | US | 7th Jul 2021 |
| 45.41.39.0/24 | 256 | ARIN | US | 3rd Oct 2024 |
| 45.42.164.0/22 | 1k | ARIN | US | 8th Jan 2021 |
| 45.42.196.0/24 | 256 | ARIN | US | 2nd Feb 2021 |
| 45.42.199.0/24 | 256 | ARIN | US | 2nd Jun 2021 |
| 45.42.213.0/24 | 256 | ARIN | US | 1st Apr 2021 |
| 45.42.224.0/24 | 256 | ARIN | US | 2nd Apr 2026 |
| 45.42.227.0/24 | 256 | ARIN | US | 1st Apr 2021 |
| 45.42.232.0/22 | 1k | ARIN |  VC | 1st Apr 2021 |
| 45.42.236.0/22 | 1k | ARIN | US | 2nd Apr 2021 |
| 45.42.249.0/24 | 256 | ARIN | US | 6th Apr 2021 |
| 45.45.140.0/22 | 1k | ARIN | US | 7th Jul 2021 |
| 45.45.149.0/24 | 256 | ARIN | US | 14th Jul 2021 |
| 45.45.150.0/24 | 256 | ARIN | US | 21st Jul 2021 |
| 45.45.156.0/24 | 256 | ARIN | US | 31st Jul 2026 |
| 45.45.157.0/24 | 256 | ARIN | US | 21st Jul 2021 |
| 45.45.192.0/24 | 256 | ARIN | US | 10th Aug 2021 |
| 45.59.138.0/24 | 256 | ARIN | US | 8th Jul 2021 |
| 45.59.166.0/24 | 256 | ARIN | US | 8th Jul 2021 |
| 45.59.176.0/22 | 1k | ARIN |  CA | 6th Jul 2021 |
| 45.59.180.0/22 | 1k | ARIN | US | 29th Sept 2023 |
| 45.6.242.0/23 | 512 | LACNIC |  BR | 4th May 2017 |
| 45.6.248.0/22 | 1k | LACNIC |  UY | 27th Apr 2017 |
| 45.6.252.0/22 | 1k | LACNIC | UY | 27th Apr 2017 |
| 45.6.52.0/22 | 1k | LACNIC | BR | 28th Mar 2017 |
| 45.61.32.0/20 | 4.1k | ARIN | US | 5th Jan 2015 |
| 45.62.32.0/19 | 8.2k | ARIN | US | 16th Jan 2015 |
| 45.64.16.0/22 | 1k | APNIC |  IN | 12th Jun 2014 |
| 45.64.44.0/22 | 1k | APNIC |  ID | 12th Jun 2014 |