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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 the most unannounced blocks, largest first.
Unannounced blocks
84,584 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 45.56.192.0/23 | 512 | ARIN | US | 28th Sept 2016 |
| 45.56.194.0/24 | 256 | ARIN | US | 28th Sept 2016 |
| 45.56.196.0/22 | 1k | ARIN | US | 28th Sept 2016 |
| 45.59.151.0/24 | 256 | ARIN |  CA | 2nd Oct 2026 |
| 45.59.159.0/24 | 256 | ARIN | US | 5th Jan 2022 |
| 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 |
| 45.6.104.0/22 | 1k | LACNIC |  AR | 7th Apr 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 |
| 45.61.32.0/21 | 2k | ARIN | CA | 29th Sept 2026 |
| 45.62.32.0/19 | 8.2k | ARIN | US | 16th Jan 2015 |
| 45.64.208.0/22 | 1k | APNIC |  IN | 17th Jun 2014 |
| 45.64.44.0/22 | 1k | APNIC |  ID | 12th Jun 2014 |
| 45.65.100.0/22 | 1k | RIPE NCC |  IL | 13th Nov 2018 |
| 45.65.12.0/24 | 256 | APNIC |  AU | 28th May 2014 |
| 45.65.13.0/24 | 256 | APNIC | AU | 28th May 2014 |
| 45.65.14.0/23 | 512 | APNIC | AU | 28th May 2014 |
| 45.65.16.0/22 | 1k | APNIC |  CN | 3rd Mar 2016 |
| 45.65.202.0/24 | 256 | LACNIC | AR | 1st Jun 2017 |
| 45.65.24.0/22 | 1k | APNIC | CN | 3rd Mar 2016 |
| 45.65.28.0/22 | 1k | APNIC | CN | 3rd Mar 2016 |
| 45.65.32.0/22 | 1k | APNIC |  HK | 7th Mar 2016 |
| 45.65.40.0/22 | 1k | APNIC | IN | 7th Mar 2016 |
| 45.65.72.0/22 | 1k | RIPE NCC |  SA | 12th Nov 2018 |
| 45.66.12.0/22 | 1k | RIPE NCC |  RU | 12th Feb 2019 |
| 45.66.136.0/22 | 1k | RIPE NCC |  DE | 13th Feb 2019 |
| 45.66.172.0/22 | 1k | RIPE NCC |  CH | 13th Feb 2019 |
| 45.66.236.0/22 | 1k | RIPE NCC |  RO | 14th Feb 2019 |
| 45.67.14.0/24 | 256 | RIPE NCC |  GE | 15th Feb 2019 |
| 45.67.160.0/22 | 1k | RIPE NCC |  NO | 19th Feb 2019 |
| 45.67.176.0/22 | 1k | RIPE NCC | RO | 19th Feb 2019 |
| 45.67.236.0/22 | 1k | RIPE NCC |  CY | 20th Feb 2019 |
| 45.67.240.0/22 | 1k | RIPE NCC |  FR | 20th Feb 2019 |
| 45.67.44.0/22 | 1k | RIPE NCC |  AT | 15th Feb 2019 |
| 45.68.0.0/22 | 1k | LACNIC |  BO | 17th Sept 2020 |
| 45.68.112.0/24 | 256 | LACNIC | BR | 3rd Dec 2025 |
| 45.68.114.0/23 | 512 | LACNIC |  CL | 31st Mar 2026 |
| 45.68.116.0/22 | 1k | LACNIC |  PE | 6th May 2026 |
| 45.68.12.0/22 | 1k | LACNIC | AR | 24th Mar 2021 |
| 45.68.124.0/22 | 1k | LACNIC | CL | 15th May 2026 |
| 45.68.128.0/22 | 1k | LACNIC |  CO | 28th May 2026 |