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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,459 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2604:ff80::/32 | 4.3B × /64 | ARIN |  CA | 13th Sept 2013 |
| 2605:1040::/32 | 4.3B × /64 | ARIN |  US | 5th Dec 2018 |
| 2605:10c0::/32 | 4.3B × /64 | ARIN | US | 6th Dec 2018 |
| 2605:1140::/32 | 4.3B × /64 | ARIN | US | 11th Dec 2018 |
| 2605:1180::/32 | 4.3B × /64 | ARIN | US | 22nd Oct 2013 |
| 2605:11c0::/32 | 4.3B × /64 | ARIN | CA | 11th Dec 2018 |
| 2605:1240::/32 | 4.3B × /64 | ARIN | CA | 21st Dec 2018 |
| 2605:1280::/32 | 4.3B × /64 | ARIN | US | 23rd Oct 2013 |
| 2605:1300::/32 | 4.3B × /64 | ARIN | CA | 3rd Jun 2011 |
| 2605:1340::/32 | 4.3B × /64 | ARIN | US | 3rd Jan 2019 |
| 2605:1380::/32 | 4.3B × /64 | ARIN | CA | 24th Oct 2013 |
| 2605:13c0::/32 | 4.3B × /64 | ARIN | US | 3rd Jan 2019 |
| 2605:1400::/32 | 4.3B × /64 | ARIN | US | 22nd Jul 2010 |
| 2605:1440::/32 | 4.3B × /64 | ARIN | US | 3rd Jan 2019 |
| 2605:1480::/32 | 4.3B × /64 | ARIN | US | 25th Oct 2013 |
| 2605:14c0::/32 | 4.3B × /64 | ARIN | US | 4th Jan 2019 |
| 2605:1580::/32 | 4.3B × /64 | ARIN | US | 25th Oct 2013 |
| 2605:160::/32 | 4.3B × /64 | ARIN | US | 20th Jul 2026 |
| 2605:1780::/32 | 4.3B × /64 | ARIN | US | 29th Oct 2013 |
| 2605:17c0::/32 | 4.3B × /64 | ARIN | US | 8th Jan 2019 |
| 2605:1840::/32 | 4.3B × /64 | ARIN | US | 15th Jan 2019 |
| 2605:19c0::/32 | 4.3B × /64 | ARIN | US | 22nd Jan 2019 |
| 2605:1a00::/32 | 4.3B × /64 | ARIN | US | 13th Dec 2010 |
| 2605:1a40::/32 | 4.3B × /64 | ARIN | US | 23rd Jan 2019 |
| 2605:1a80::/32 | 4.3B × /64 | ARIN | US | 6th Nov 2013 |
| 2605:1ac0::/32 | 4.3B × /64 | ARIN | US | 23rd Jan 2019 |
| 2605:1b80::/32 | 4.3B × /64 | ARIN | US | 6th Nov 2013 |
| 2605:1bc0::/32 | 4.3B × /64 | ARIN | US | 28th Jan 2019 |
| 2605:1c0::/32 | 4.3B × /64 | ARIN | US | 16th Jul 2026 |
| 2605:1c40::/32 | 4.3B × /64 | ARIN | US | 20th Feb 2026 |
| 2605:1c80::/32 | 4.3B × /64 | ARIN | CA | 11th Nov 2013 |
| 2605:1d00::/32 | 4.3B × /64 | ARIN | US | 8th Jun 2011 |
| 2605:1d40::/32 | 4.3B × /64 | ARIN | US | 30th Jan 2019 |
| 2605:1dc0::/32 | 4.3B × /64 | ARIN | US | 1st Feb 2019 |
| 2605:1e00::/32 | 4.3B × /64 | ARIN | US | 14th Dec 2010 |
| 2605:1e40::/32 | 4.3B × /64 | ARIN | US | 1st Feb 2019 |
| 2605:1f40::/32 | 4.3B × /64 | ARIN | US | 5th Feb 2019 |
| 2605:1f80::/32 | 4.3B × /64 | ARIN | US | 14th Nov 2013 |
| 2605:1fc0::/32 | 4.3B × /64 | ARIN | US | 8th Feb 2019 |
| 2605:2000::/32 | 4.3B × /64 | ARIN | US | 3rd Mar 2010 |
| 2605:2040::/32 | 4.3B × /64 | ARIN | US | 8th Feb 2019 |
| 2605:20c0::/32 | 4.3B × /64 | ARIN | US | 8th Feb 2019 |
| 2605:2100::/36 | 268M × /64 | ARIN | CA | 9th Jun 2011 |
| 2605:2180::/32 | 4.3B × /64 | ARIN | US | 19th Nov 2013 |
| 2605:2200::/32 | 4.3B × /64 | ARIN | US | 15th Dec 2010 |
| 2605:2240::/32 | 4.3B × /64 | ARIN | US | 13th Feb 2019 |
| 2605:22c0::/32 | 4.3B × /64 | ARIN | US | 21st Feb 2019 |
| 2605:2340::/32 | 4.3B × /64 | ARIN | US | 26th Feb 2019 |
| 2605:2380::/32 | 4.3B × /64 | ARIN | US | 20th Nov 2013 |
| 2605:23c0::/32 | 4.3B × /64 | ARIN | US | 24th Feb 2026 |