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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in Canada
3,819 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2602:ff0d::/36 | 268M × /64 | ARIN |  CA | 31st Jan 2017 |
| 2602:ff21::/36 | 268M × /64 | ARIN | CA | 31st Oct 2016 |
| 2602:ff3d::/36 | 268M × /64 | ARIN | CA | 7th Jun 2016 |
| 2602:ff45::/36 | 268M × /64 | ARIN | CA | 6th May 2016 |
| 2602:ff66::/36 | 268M × /64 | ARIN | CA | 9th Oct 2015 |
| 2602:ff6d::/36 | 268M × /64 | ARIN | CA | 14th Sept 2015 |
| 2602:ff9c::/36 | 268M × /64 | ARIN | CA | 21st Nov 2014 |
| 2602:ff9d::/36 | 268M × /64 | ARIN | CA | 20th Nov 2014 |
| 2602:ff9f::/36 | 268M × /64 | ARIN | CA | 11th Nov 2014 |
| 2602:ffb1::/36 | 268M × /64 | ARIN | CA | 7th Jul 2014 |
| 2602:ffbe::/36 | 268M × /64 | ARIN | CA | 20th May 2014 |
| 2604:10e0::/32 | 4.3B × /64 | ARIN | CA | 21st May 2025 |
| 2604:12a0::/32 | 4.3B × /64 | ARIN | CA | 4th Jun 2025 |
| 2604:1340::/32 | 4.3B × /64 | ARIN | CA | 6th Feb 2017 |
| 2604:13c0::/32 | 4.3B × /64 | ARIN | CA | 6th Feb 2017 |
| 2604:160::/32 | 4.3B × /64 | ARIN | CA | 23rd Jan 2025 |
| 2604:1640::/32 | 4.3B × /64 | ARIN | CA | 9th Feb 2017 |
| 2604:1680::/32 | 4.3B × /64 | ARIN | CA | 6th Sept 2012 |
| 2604:16a0::/32 | 4.3B × /64 | ARIN | CA | 9th Jul 2025 |
| 2604:1860::/32 | 4.3B × /64 | ARIN | CA | 24th Jul 2025 |
| 2604:18a0::/32 | 4.3B × /64 | ARIN | CA | 24th Jul 2025 |
| 2604:18e0::/32 | 4.3B × /64 | ARIN | CA | 24th Jul 2025 |
| 2604:1920::/32 | 4.3B × /64 | ARIN | CA | 24th Jul 2025 |
| 2604:1b00::/32 | 4.3B × /64 | ARIN | CA | 24th Mar 2011 |
| 2604:1d00::/32 | 4.3B × /64 | ARIN | CA | 25th Mar 2011 |
| 2604:1e80::/32 | 4.3B × /64 | ARIN | CA | 24th Sept 2012 |
| 2604:23c0::/32 | 4.3B × /64 | ARIN | CA | 16th Mar 2017 |
| 2604:2460::/32 | 4.3B × /64 | ARIN | CA | 7th Oct 2025 |
| 2604:2580::/32 | 4.3B × /64 | ARIN | CA | 15th Oct 2012 |
| 2604:2840::/32 | 4.3B × /64 | ARIN | CA | 21st Mar 2017 |
| 2604:3b00::/32 | 4.3B × /64 | ARIN | CA | 4th Apr 2011 |
| 2604:3e40::/32 | 4.3B × /64 | ARIN | CA | 9th May 2017 |
| 2604:400::/32 | 4.3B × /64 | ARIN | CA | 16th Jun 2010 |
| 2604:4140::/32 | 4.3B × /64 | ARIN | CA | 19th May 2017 |
| 2604:4240::/36 | 268M × /64 | ARIN | CA | 25th May 2017 |
| 2604:45c0::/32 | 4.3B × /64 | ARIN | CA | 7th Jun 2017 |
| 2604:4680::/32 | 4.3B × /64 | ARIN | CA | 14th Dec 2012 |
| 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 |