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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 2605:8740::/28 | 68.7B × /64 | ARIN |  US | 17th Dec 2019 |
| 2605:8800::/32 | 4.3B × /64 | ARIN | US | 3rd May 2010 |
| 2605:8880::/32 | 4.3B × /64 | ARIN | US | 20th Jun 2014 |
| 2605:88c0::/32 | 4.3B × /64 | ARIN | US | 18th Dec 2019 |
| 2605:8940::/32 | 4.3B × /64 | ARIN |  GB | 19th Dec 2019 |
| 2605:8980::/32 | 4.3B × /64 | ARIN | US | 23rd Jun 2014 |
| 2605:89c0::/32 | 4.3B × /64 | ARIN | US | 19th Dec 2019 |
| 2605:8a00::/32 | 4.3B × /64 | ARIN | US | 6th Jan 2011 |
| 2605:8a80::/32 | 4.3B × /64 | ARIN | US | 24th Jun 2014 |
| 2605:8b00::/32 | 4.3B × /64 | ARIN | US | 29th Jul 2011 |
| 2605:8b80::/32 | 4.3B × /64 | ARIN | US | 24th Jun 2014 |
| 2605:8c00::/32 | 4.3B × /64 | ARIN | US | 11th Aug 2010 |
| 2605:8c0::/32 | 4.3B × /64 | ARIN | US | 5th Nov 2018 |
| 2605:8d00::/32 | 4.3B × /64 | ARIN | US | 29th Jul 2011 |
| 2605:8e40::/32 | 4.3B × /64 | ARIN | US | 2nd Jan 2020 |
| 2605:8ec0::/32 | 4.3B × /64 | ARIN | US | 8th Jan 2020 |
| 2605:8f00::/32 | 4.3B × /64 | ARIN | US | 31st Mar 2026 |
| 2605:8f40::/32 | 4.3B × /64 | ARIN |  CA | 8th Jan 2020 |
| 2605:8f80::/32 | 4.3B × /64 | ARIN | US | 30th Jun 2014 |
| 2605:9040::/32 | 4.3B × /64 | ARIN | US | 8th Jan 2020 |
| 2605:9200::/32 | 4.3B × /64 | ARIN | US | 7th Jan 2011 |
| 2605:9340::/32 | 4.3B × /64 | ARIN | CA | 13th Jan 2020 |
| 2605:9380::/32 | 4.3B × /64 | ARIN | US | 15th Jul 2014 |
| 2605:93c0::/32 | 4.3B × /64 | ARIN | US | 13th Jan 2020 |
| 2605:94c0::/32 | 4.3B × /64 | ARIN | US | 15th Jan 2020 |
| 2605:9540::/32 | 4.3B × /64 | ARIN | US | 16th Jan 2020 |
| 2605:9580::/32 | 4.3B × /64 | ARIN | US | 18th Jul 2014 |
| 2605:9680::/32 | 4.3B × /64 | ARIN | CA | 22nd Jul 2014 |
| 2605:9700::/32 | 4.3B × /64 | ARIN | US | 2nd Aug 2011 |
| 2605:97c0::/32 | 4.3B × /64 | ARIN | US | 22nd Jan 2020 |
| 2605:9800::/32 | 4.3B × /64 | ARIN | US | 5th May 2010 |
| 2605:98c0::/32 | 4.3B × /64 | ARIN | CA | 23rd Jan 2020 |
| 2605:9900::/32 | 4.3B × /64 | ARIN | US | 2nd Aug 2011 |
| 2605:9980::/32 | 4.3B × /64 | ARIN | US | 1st Aug 2014 |
| 2605:99c0::/32 | 4.3B × /64 | ARIN | US | 23rd Jan 2020 |
| 2605:9a80::/32 | 4.3B × /64 | ARIN | US | 7th Aug 2014 |
| 2605:9ac0::/32 | 4.3B × /64 | ARIN | US | 27th Jan 2020 |
| 2605:9b40::/32 | 4.3B × /64 | ARIN | US | 29th Jan 2020 |
| 2605:9bc0::/32 | 4.3B × /64 | ARIN | US | 30th Jan 2020 |
| 2605:9c00::/32 | 4.3B × /64 | ARIN | US | 5th Aug 2013 |
| 2605:9c80::/32 | 4.3B × /64 | ARIN | US | 11th Aug 2014 |
| 2605:9ec0::/32 | 4.3B × /64 | ARIN | US | 5th Feb 2020 |
| 2605:9f40::/32 | 4.3B × /64 | ARIN | US | 5th Feb 2020 |
| 2605:a0c0::/32 | 4.3B × /64 | ARIN | US | 10th Feb 2020 |
| 2605:a180::/32 | 4.3B × /64 | ARIN | US | 22nd Aug 2014 |
| 2605:a280::/32 | 4.3B × /64 | ARIN | US | 25th Aug 2014 |
| 2605:a300::/32 | 4.3B × /64 | ARIN | US | 8th Aug 2011 |
| 2605:a340::/32 | 4.3B × /64 | ARIN | US | 13th Feb 2020 |
| 2605:a3c0::/32 | 4.3B × /64 | ARIN | US | 13th Feb 2020 |
| 2605:a440::/32 | 4.3B × /64 | ARIN | US | 13th Feb 2020 |