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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,279 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2604:6880::/32 | 4.3B × /64 | ARIN |  CA | 8th Feb 2013 |
| 2604:68c0::/32 | 4.3B × /64 | ARIN |  US | 5th Sept 2017 |
| 2604:6a00::/32 | 4.3B × /64 | ARIN | US | 4th Nov 2010 |
| 2604:6a0::/32 | 4.3B × /64 | ARIN | US | 3rd Mar 2025 |
| 2604:6a40::/32 | 4.3B × /64 | ARIN | US | 7th Sept 2017 |
| 2604:6ac0::/32 | 4.3B × /64 | ARIN | US | 7th Sept 2017 |
| 2604:6b40::/32 | 4.3B × /64 | ARIN | US | 11th Sept 2017 |
| 2604:6bc0::/32 | 4.3B × /64 | ARIN | US | 12th Sept 2017 |
| 2604:6c00::/32 | 4.3B × /64 | ARIN | US | 24th Jun 2010 |
| 2604:6c0::/32 | 4.3B × /64 | ARIN | US | 4th Jan 2017 |
| 2604:6c40::/32 | 4.3B × /64 | ARIN | US | 14th Sept 2017 |
| 2604:6c80::/32 | 4.3B × /64 | ARIN | CA | 12th Feb 2013 |
| 2604:6dc0::/32 | 4.3B × /64 | ARIN | US | 20th Sept 2017 |
| 2604:6e0::/32 | 4.3B × /64 | ARIN | US | 4th Mar 2025 |
| 2604:6e40::/32 | 4.3B × /64 | ARIN | CA | 21st Sept 2017 |
| 2604:6e80::/32 | 4.3B × /64 | ARIN | US | 14th Feb 2013 |
| 2604:6f40::/32 | 4.3B × /64 | ARIN | US | 27th Sept 2017 |
| 2604:6f80::/32 | 4.3B × /64 | ARIN | US | 14th Feb 2013 |
| 2604:7000::/32 | 4.3B × /64 | ARIN | US | 15th Jan 2026 |
| 2604:7040::/32 | 4.3B × /64 | ARIN | US | 28th Sept 2017 |
| 2604:70::/32 | 4.3B × /64 | ARIN | US | 21st Jan 2025 |
| 2604:720::/32 | 4.3B × /64 | ARIN | US | 6th Mar 2025 |
| 2604:7240::/32 | 4.3B × /64 | ARIN | US | 6th Oct 2017 |
| 2604:7340::/32 | 4.3B × /64 | ARIN | US | 11th Oct 2017 |
| 2604:73c0::/32 | 4.3B × /64 | ARIN | US | 16th Jan 2026 |
| 2604:740::/32 | 4.3B × /64 | ARIN | US | 6th Jan 2017 |
| 2604:74c0::/32 | 4.3B × /64 | ARIN | US | 12th Oct 2017 |
| 2604:7540::/32 | 4.3B × /64 | ARIN | US | 12th Oct 2017 |
| 2604:75c0::/32 | 4.3B × /64 | ARIN | CA | 12th Oct 2017 |
| 2604:7600::/28 | 68.7B × /64 | ARIN | US | 9th Nov 2010 |
| 2604:760::/32 | 4.3B × /64 | ARIN | US | 6th Mar 2025 |
| 2604:7680::/32 | 4.3B × /64 | ARIN | US | 21st Feb 2013 |
| 2604:7700::/32 | 4.3B × /64 | ARIN | US | 21st Apr 2011 |
| 2604:7740::/32 | 4.3B × /64 | ARIN | US | 16th Oct 2017 |
| 2604:7800::/32 | 4.3B × /64 | ARIN | US | 20th Apr 2010 |
| 2604:780::/32 | 4.3B × /64 | ARIN | CA | 10th Aug 2012 |
| 2604:7880::/32 | 4.3B × /64 | ARIN | US | 21st Feb 2013 |
| 2604:78c0::/32 | 4.3B × /64 | ARIN | CA | 17th Oct 2017 |
| 2604:7900::/32 | 4.3B × /64 | ARIN | US | 21st Apr 2011 |
| 2604:7940::/32 | 4.3B × /64 | ARIN | US | 19th Oct 2017 |
| 2604:7980::/32 | 4.3B × /64 | ARIN | CA | 22nd Feb 2013 |
| 2604:79c0::/32 | 4.3B × /64 | ARIN | US | 19th Oct 2017 |
| 2604:7cc0::/32 | 4.3B × /64 | ARIN | US | 31st Oct 2017 |
| 2604:7d40::/32 | 4.3B × /64 | ARIN | CA | 1st Nov 2017 |
| 2604:7d80::/32 | 4.3B × /64 | ARIN | US | 26th Feb 2013 |
| 2604:7e0::/32 | 4.3B × /64 | ARIN | US | 12th Mar 2025 |
| 2604:7e40::/32 | 4.3B × /64 | ARIN | US | 8th Nov 2017 |
| 2604:7e80::/32 | 4.3B × /64 | ARIN | US | 27th Feb 2013 |
| 2604:7f00::/32 | 4.3B × /64 | ARIN | CA | 22nd Apr 2011 |
| 2604:7f40::/32 | 4.3B × /64 | ARIN | CA | 10th Nov 2017 |