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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
Browse by country
Countries with the most unannounced blocks, largest first.
Unannounced blocks in Canada
3,830 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2604:48c0::/32 | 4.3B × /64 | ARIN |  CA | 9th Jun 2017 |
| 2604:4a0::/32 | 4.3B × /64 | ARIN | CA | 24th Feb 2025 |
| 2604:5140::/32 | 4.3B × /64 | ARIN | CA | 3rd Jul 2017 |
| 2604:5280::/32 | 4.3B × /64 | ARIN | CA | 2nd Jan 2013 |
| 2604:5380::/32 | 4.3B × /64 | ARIN | CA | 2nd Jan 2013 |
| 2604:5580::/32 | 4.3B × /64 | ARIN | CA | 4th Jan 2013 |
| 2604:5880::/32 | 4.3B × /64 | ARIN | CA | 7th Jan 2013 |
| 2604:5a40::/32 | 4.3B × /64 | ARIN | CA | 25th Jul 2017 |
| 2604:5c40::/32 | 4.3B × /64 | ARIN | CA | 2nd Aug 2017 |
| 2604:6500::/32 | 4.3B × /64 | ARIN | CA | 11th Apr 2011 |
| 2604:6880::/32 | 4.3B × /64 | ARIN | CA | 8th Feb 2013 |
| 2604:6c80::/32 | 4.3B × /64 | ARIN | CA | 12th Feb 2013 |
| 2604:6e40::/32 | 4.3B × /64 | ARIN | CA | 21st Sept 2017 |
| 2604:75c0::/32 | 4.3B × /64 | ARIN | CA | 12th Oct 2017 |
| 2604:780::/32 | 4.3B × /64 | ARIN | CA | 10th Aug 2012 |
| 2604:78c0::/32 | 4.3B × /64 | ARIN | CA | 17th Oct 2017 |
| 2604:7980::/32 | 4.3B × /64 | ARIN | CA | 22nd Feb 2013 |
| 2604:7d40::/32 | 4.3B × /64 | ARIN | CA | 1st Nov 2017 |
| 2604:7f00::/32 | 4.3B × /64 | ARIN | CA | 22nd Apr 2011 |
| 2604:7f40::/32 | 4.3B × /64 | ARIN | CA | 10th Nov 2017 |
| 2604:8400::/32 | 4.3B × /64 | ARIN | CA | 29th Jun 2010 |
| 2604:840::/32 | 4.3B × /64 | ARIN | CA | 9th Jan 2017 |
| 2604:8600::/32 | 4.3B × /64 | ARIN | CA | 15th Nov 2010 |
| 2604:8980::/32 | 4.3B × /64 | ARIN | CA | 8th Mar 2013 |
| 2604:920::/32 | 4.3B × /64 | ARIN | CA | 18th Mar 2025 |
| 2604:a3c0::/32 | 4.3B × /64 | ARIN | CA | 16th Feb 2018 |
| 2604:a500::/32 | 4.3B × /64 | ARIN | CA | 29th Jan 2026 |
| 2604:a740::/32 | 4.3B × /64 | ARIN | CA | 23rd Feb 2018 |
| 2604:a8c0::/32 | 4.3B × /64 | ARIN | CA | 26th Feb 2018 |
| 2604:af00::/32 | 4.3B × /64 | ARIN | CA | 21st Oct 2026 |
| 2604:b0::/32 | 4.3B × /64 | ARIN | CA | 21st Jan 2025 |
| 2604:b280::/32 | 4.3B × /64 | ARIN | CA | 26th Apr 2013 |
| 2604:b60::/32 | 4.3B × /64 | ARIN | CA | 15th Apr 2025 |
| 2604:c280::/32 | 4.3B × /64 | ARIN | CA | 3rd Nov 2026 |
| 2604:c2c0::/32 | 4.3B × /64 | ARIN | CA | 11th Apr 2018 |
| 2604:c440::/32 | 4.3B × /64 | ARIN | CA | 12th Apr 2018 |
| 2604:cec0::/32 | 4.3B × /64 | ARIN | CA | 10th May 2018 |
| 2604:d0::/32 | 4.3B × /64 | ARIN | CA | 16th Jan 2025 |
| 2604:d40::/32 | 4.3B × /64 | ARIN | CA | 13th Jan 2017 |
| 2604:dc0::/32 | 4.3B × /64 | ARIN | CA | 20th Jan 2017 |
| 2604:e80::/32 | 4.3B × /64 | ARIN | CA | 24th Aug 2012 |
| 2604:ea0::/32 | 4.3B × /64 | ARIN | CA | 29th Apr 2025 |
| 2604:ec40::/32 | 4.3B × /64 | ARIN | CA | 6th Feb 2026 |
| 2604:f000::/32 | 4.3B × /64 | ARIN | CA | 16th Mar 2010 |
| 2604:f800::/32 | 4.3B × /64 | ARIN | CA | 26th Apr 2010 |
| 2604:fa80::/32 | 4.3B × /64 | ARIN | CA | 28th Aug 2013 |
| 2604:fc0::/32 | 4.3B × /64 | ARIN | CA | 23rd Jan 2017 |
| 2604:ff80::/32 | 4.3B × /64 | ARIN | CA | 13th Sept 2013 |
| 2605:11c0::/32 | 4.3B × /64 | ARIN | CA | 11th Dec 2018 |
| 2605:1240::/32 | 4.3B × /64 | ARIN | CA | 21st Dec 2018 |