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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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:c50::/32 | 4.3B × /64 | LACNIC |  CR | 30th Nov 2023 |
| 2803:c540::/32 | 4.3B × /64 | LACNIC |  GT | 12th Jan 2016 |
| 2803:c560::/32 | 4.3B × /64 | LACNIC |  PA | 14th Aug 2019 |
| 2803:c580::/32 | 4.3B × /64 | LACNIC |  AR | 8th Jul 2014 |
| 2803:c590::/32 | 4.3B × /64 | LACNIC |  VE | 24th Mar 2023 |
| 2803:c5e0::/32 | 4.3B × /64 | LACNIC | AR | 8th Jun 2020 |
| 2803:c60::/32 | 4.3B × /64 | LACNIC | AR | 3rd May 2019 |
| 2803:c620::/32 | 4.3B × /64 | LACNIC | AR | 31st Oct 2017 |
| 2803:c630::/32 | 4.3B × /64 | LACNIC | AR | 13th Apr 2026 |
| 2803:c660::/32 | 4.3B × /64 | LACNIC |  CO | 11th Jun 2019 |
| 2803:c6a0::/32 | 4.3B × /64 | LACNIC | AR | 17th Aug 2018 |
| 2803:c6c0::/32 | 4.3B × /64 | LACNIC | AR | 7th Feb 2017 |
| 2803:c6e0::/32 | 4.3B × /64 | LACNIC |  BO | 28th Feb 2020 |
| 2803:c700::/32 | 4.3B × /64 | LACNIC |  GF | 4th Jun 2013 |
| 2803:c720::/32 | 4.3B × /64 | LACNIC |  EC | 19th Mar 2018 |
| 2803:c730::/32 | 4.3B × /64 | LACNIC | VE | 2nd Sept 2026 |
| 2803:c740::/32 | 4.3B × /64 | LACNIC | AR | 21st Jun 2016 |
| 2803:c750::/32 | 4.3B × /64 | LACNIC |  DO | 10th Sept 2024 |
| 2803:c780::/32 | 4.3B × /64 | LACNIC | AR | 4th Dec 2014 |
| 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:c8d0::/32 | 4.3B × /64 | LACNIC |  PE | 21st Nov 2024 |
| 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:c980::/32 | 4.3B × /64 | LACNIC | CL | 16th Jun 2014 |
| 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:ca60::/32 | 4.3B × /64 | LACNIC | CO | 30th May 2019 |
| 2803:ca80::/32 | 4.3B × /64 | LACNIC | CL | 5th Mar 2014 |
| 2803:ca90::/32 | 4.3B × /64 | LACNIC | GT | 21st Sept 2022 |
| 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 |