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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,221 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2803:cb60::/32 | 4.3B × /64 | LACNIC |  AR | 4th Oct 2019 |
| 2803:cbd0::/32 | 4.3B × /64 | LACNIC |  UY | 7th Oct 2025 |
| 2803:cbe0::/32 | 4.3B × /64 | LACNIC | AR | 10th Aug 2020 |
| 2803:cc00::/32 | 4.3B × /64 | LACNIC |  CO | 25th Apr 2012 |
| 2803:cc0::/32 | 4.3B × /64 | LACNIC |  CL | 9th Nov 2016 |
| 2803:cc30::/32 | 4.3B × /64 | LACNIC | CO | 10th Feb 2026 |
| 2803:cc80::/32 | 4.3B × /64 | LACNIC | AR | 26th Nov 2013 |
| 2803:cc90::/32 | 4.3B × /64 | LACNIC |  EC | 3rd Aug 2022 |
| 2803:cca0::/32 | 4.3B × /64 | LACNIC | CL | 25th Jun 2018 |
| 2803:ccc0::/32 | 4.3B × /64 | LACNIC | AR | 11th Nov 2016 |
| 2803:cce0::/32 | 4.3B × /64 | LACNIC | AR | 16th Jan 2020 |
| 2803:cd00::/32 | 4.3B × /64 | LACNIC | AR | 13th Feb 2013 |
| 2803:cd0::/32 | 4.3B × /64 | LACNIC | CL | 2nd Jan 2025 |
| 2803:cd10::/32 | 4.3B × /64 | LACNIC | AR | 10th Jan 2022 |
| 2803:cd20::/32 | 4.3B × /64 | LACNIC | AR | 15th Jan 2018 |
| 2803:cd30::/32 | 4.3B × /64 | LACNIC | AR | 6th Jul 2026 |
| 2803:cd40::/32 | 4.3B × /64 | LACNIC | AR | 15th Feb 2016 |
| 2803:cd50::/32 | 4.3B × /64 | LACNIC | CL | 28th Jun 2024 |
| 2803:cd90::/32 | 4.3B × /64 | LACNIC | CO | 25th Apr 2023 |
| 2803:cdd0::/32 | 4.3B × /64 | LACNIC | AR | 13th Aug 2025 |
| 2803:ce0::/32 | 4.3B × /64 | LACNIC | AR | 13th Jan 2020 |
| 2803:ce40::/32 | 4.3B × /64 | LACNIC | AR | 5th Oct 2015 |
| 2803:ce60::/32 | 4.3B × /64 | LACNIC | AR | 26th Jun 2019 |
| 2803:ce80::/32 | 4.3B × /64 | LACNIC | AR | 8th May 2014 |
| 2803:ce90::/32 | 4.3B × /64 | LACNIC |  PA | 11th Nov 2022 |
| 2803:cea0::/32 | 4.3B × /64 | LACNIC | AR | 14th Sept 2018 |
| 2803:cf60::/32 | 4.3B × /64 | LACNIC | AR | 5th Nov 2019 |
| 2803:cf80::/32 | 4.3B × /64 | LACNIC | AR | 18th Feb 2015 |
| 2803:cf90::/32 | 4.3B × /64 | LACNIC | EC | 4th Sept 2023 |
| 2803:cfa0::/32 | 4.3B × /64 | LACNIC |  DO | 7th Mar 2019 |
| 2803:cfc0::/32 | 4.3B × /64 | LACNIC | UY | 31st Jul 2017 |
| 2803:cfe0::/32 | 4.3B × /64 | LACNIC | CL | 1st Sept 2020 |
| 2803:d020::/32 | 4.3B × /64 | LACNIC |  CR | 18th Aug 2017 |
| 2803:d030::/32 | 4.3B × /64 | LACNIC |  VE | 18th Dec 2025 |
| 2803:d040::/32 | 4.3B × /64 | LACNIC | PA | 7th Apr 2015 |
| 2803:d0e0::/32 | 4.3B × /64 | LACNIC | AR | 29th Nov 2019 |
| 2803:d10::/32 | 4.3B × /64 | LACNIC | AR | 30th Dec 2021 |
| 2803:d140::/32 | 4.3B × /64 | LACNIC | CL | 11th Nov 2015 |
| 2803:d150::/32 | 4.3B × /64 | LACNIC | EC | 9th May 2024 |
| 2803:d160::/32 | 4.3B × /64 | LACNIC | AR | 25th Jul 2019 |
| 2803:d180::/32 | 4.3B × /64 | LACNIC | EC | 3rd Jun 2014 |
| 2803:d1c0::/32 | 4.3B × /64 | LACNIC | CL | 23rd Mar 2017 |
| 2803:d1d0::/32 | 4.3B × /64 | LACNIC | AR | 11th Jun 2025 |
| 2803:d230::/32 | 4.3B × /64 | LACNIC |  PE | 11th Mar 2026 |
| 2803:d240::/32 | 4.3B × /64 | LACNIC | AR | 3rd Aug 2015 |
| 2803:d260::/32 | 4.3B × /64 | LACNIC |  PY | 28th May 2019 |
| 2803:d2a0::/32 | 4.3B × /64 | LACNIC | CL | 19th Jul 2018 |
| 2803:d2c0::/32 | 4.3B × /64 | LACNIC | AR | 3rd Jan 2017 |
| 2803:d2d0::/32 | 4.3B × /64 | LACNIC | CO | 20th Feb 2025 |
| 2803:d2e0::/32 | 4.3B × /64 | LACNIC |  SV | 3rd Feb 2020 |