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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,481 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2803:c790::/32 | 4.3B × /64 | LACNIC |  VE | 15th Aug 2023 |
| 2803:c7c0::/32 | 4.3B × /64 | LACNIC |  HN | 10th Jul 2017 |
| 2803:c80::/32 | 4.3B × /64 | LACNIC |  PY | 19th Nov 2013 |
| 2803:c810::/32 | 4.3B × /64 | LACNIC |  DO | 28th Oct 2020 |
| 2803:c820::/32 | 4.3B × /64 | LACNIC |  PA | 24th Aug 2017 |
| 2803:c830::/32 | 4.3B × /64 | LACNIC | VE | 23rd Dec 2025 |
| 2803:c860::/32 | 4.3B × /64 | LACNIC |  AR | 2nd Apr 2019 |
| 2803:c890::/32 | 4.3B × /64 | LACNIC | DO | 25th May 2022 |
| 2803:c8a0::/32 | 4.3B × /64 | LACNIC |  CL | 15th May 2018 |
| 2803:c8b0::/32 | 4.3B × /64 | LACNIC | VE | 22nd Oct 2026 |
| 2803:c8e0::/32 | 4.3B × /64 | LACNIC |  CO | 10th Dec 2019 |
| 2803:c910::/32 | 4.3B × /64 | LACNIC | CL | 22nd Oct 2021 |
| 2803:c920::/32 | 4.3B × /64 | LACNIC | AR | 7th Dec 2017 |
| 2803:c930::/32 | 4.3B × /64 | LACNIC | VE | 4th Jun 2026 |
| 2803:c940::/32 | 4.3B × /64 | LACNIC |  CR | 23rd Nov 2015 |
| 2803:c950::/32 | 4.3B × /64 | LACNIC | CL | 21st May 2024 |
| 2803:c960::/32 | 4.3B × /64 | LACNIC | CO | 1st Aug 2019 |
| 2803:c990::/32 | 4.3B × /64 | LACNIC | AR | 6th Feb 2023 |
| 2803:c9a0::/32 | 4.3B × /64 | LACNIC | CL | 26th Oct 2018 |
| 2803:c9c0::/32 | 4.3B × /64 | LACNIC | AR | 6th Apr 2017 |
| 2803:c9d0::/32 | 4.3B × /64 | LACNIC |  PE | 18th Jun 2025 |
| 2803:ca00::/32 | 4.3B × /64 | LACNIC | AR | 9th Jul 2012 |
| 2803:ca10::/32 | 4.3B × /64 | LACNIC | VE | 28th May 2021 |
| 2803:ca40::/32 | 4.3B × /64 | LACNIC | AR | 12th Aug 2015 |
| 2803:ca80::/32 | 4.3B × /64 | LACNIC | CL | 5th Mar 2014 |
| 2803:caa0::/32 | 4.3B × /64 | LACNIC | CO | 27th Jul 2018 |
| 2803:cac0::/32 | 4.3B × /64 | LACNIC |  HT | 17th Jan 2017 |
| 2803:cb10::/32 | 4.3B × /64 | LACNIC | CO | 18th Feb 2022 |
| 2803:cb30::/32 | 4.3B × /64 | LACNIC | AR | 12th Aug 2026 |
| 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:cc80::/32 | 4.3B × /64 | LACNIC | AR | 26th Nov 2013 |
| 2803:cc90::/32 | 4.3B × /64 | LACNIC |  EC | 3rd Aug 2022 |
| 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 |