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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 2602:ffdf::/36 | 268M × /64 | ARIN |  US | 25th Oct 2013 |
| 2602:ffea::/32 | 4.3B × /64 | ARIN | US | 23rd Aug 2013 |
| 2602:ffeb::/36 | 268M × /64 | ARIN | US | 26th Jul 2013 |
| 2602:ffee::/36 | 268M × /64 | ARIN | US | 18th Jul 2013 |
| 2602:ffef::/36 | 268M × /64 | ARIN | US | 17th Jul 2013 |
| 2602:fff0::/36 | 268M × /64 | ARIN | US | 4th Dec 2012 |
| 2602:fff7::/36 | 268M × /64 | ARIN | US | 28th Jun 2013 |
| 2602:fffc::/32 | 4.3B × /64 | ARIN | US | 18th Apr 2013 |
| 2602:ffff::/36 | 268M × /64 | ARIN | US | 12th Mar 2013 |
| 2604:100::/32 | 4.3B × /64 | ARIN | US | 18th Mar 2011 |
| 2604:1020::/32 | 4.3B × /64 | ARIN | US | 13th May 2025 |
| 2604:1060::/32 | 4.3B × /64 | ARIN | US | 19th May 2025 |
| 2604:1080::/32 | 4.3B × /64 | ARIN | US | 27th Aug 2012 |
| 2604:10::/32 | 4.3B × /64 | ARIN | US | 26th Oct 2010 |
| 2604:10a0::/32 | 4.3B × /64 | ARIN | US | 19th May 2025 |
| 2604:10e0::/32 | 4.3B × /64 | ARIN |  CA | 21st May 2025 |
| 2604:1100::/32 | 4.3B × /64 | ARIN | US | 22nd Mar 2011 |
| 2604:1140::/32 | 4.3B × /64 | ARIN | US | 30th Jan 2017 |
| 2604:1160::/32 | 4.3B × /64 | ARIN | US | 28th May 2025 |
| 2604:1180::/32 | 4.3B × /64 | ARIN | US | 27th Aug 2012 |
| 2604:1200::/32 | 4.3B × /64 | ARIN | US | 20th Oct 2010 |
| 2604:1220::/32 | 4.3B × /64 | ARIN | US | 2nd Jun 2025 |
| 2604:1240::/32 | 4.3B × /64 | ARIN | US | 2nd Feb 2017 |
| 2604:1260::/32 | 4.3B × /64 | ARIN | US | 4th Jun 2025 |
| 2604:12a0::/32 | 4.3B × /64 | ARIN | CA | 4th Jun 2025 |
| 2604:12c0::/32 | 4.3B × /64 | ARIN | US | 3rd Feb 2017 |
| 2604:1320::/32 | 4.3B × /64 | ARIN | US | 6th Jun 2025 |
| 2604:1340::/32 | 4.3B × /64 | ARIN | CA | 6th Feb 2017 |
| 2604:1360::/32 | 4.3B × /64 | ARIN | US | 9th Jun 2025 |
| 2604:13c0::/32 | 4.3B × /64 | ARIN | CA | 6th Feb 2017 |
| 2604:13e0::/32 | 4.3B × /64 | ARIN | US | 13th Jun 2025 |
| 2604:1400::/32 | 4.3B × /64 | ARIN |  PR | 17th Jun 2010 |
| 2604:140::/32 | 4.3B × /64 | ARIN |  BM | 19th Dec 2016 |
| 2604:1440::/32 | 4.3B × /64 | ARIN | US | 7th Feb 2017 |
| 2604:14a0::/32 | 4.3B × /64 | ARIN | US | 20th Jun 2025 |
| 2604:1540::/32 | 4.3B × /64 | ARIN | US | 8th Feb 2017 |
| 2604:15a0::/32 | 4.3B × /64 | ARIN | US | 26th Jun 2025 |
| 2604:15c0::/32 | 4.3B × /64 | ARIN | US | 9th Feb 2017 |
| 2604:160::/32 | 4.3B × /64 | ARIN | CA | 23rd Jan 2025 |
| 2604:1620::/32 | 4.3B × /64 | ARIN | US | 7th Jul 2025 |
| 2604:1640::/32 | 4.3B × /64 | ARIN | CA | 9th Feb 2017 |
| 2604:1660::/32 | 4.3B × /64 | ARIN | US | 8th Jul 2025 |
| 2604:1680::/32 | 4.3B × /64 | ARIN | CA | 6th Sept 2012 |
| 2604:16a0::/32 | 4.3B × /64 | ARIN | CA | 9th Jul 2025 |
| 2604:16c0::/32 | 4.3B × /64 | ARIN | US | 10th Feb 2017 |
| 2604:16e0::/32 | 4.3B × /64 | ARIN | US | 15th Jul 2025 |
| 2604:1720::/32 | 4.3B × /64 | ARIN | US | 17th Jul 2025 |
| 2604:1780::/32 | 4.3B × /64 | ARIN |  KY | 6th Sept 2012 |
| 2604:17a0::/32 | 4.3B × /64 | ARIN | US | 21st Jul 2025 |
| 2604:17e0::/32 | 4.3B × /64 | ARIN | PR | 22nd Jul 2025 |