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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
Browse by country
Countries with the most unannounced blocks, largest first.
Unannounced blocks
84,459 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2605:76c0::/32 | 4.3B × /64 | ARIN |  US | 30th Oct 2019 |
| 2605:77c0::/32 | 4.3B × /64 | ARIN | US | 31st Oct 2019 |
| 2605:7840::/32 | 4.3B × /64 | ARIN | US | 5th Nov 2019 |
| 2605:7880::/32 | 4.3B × /64 | ARIN | US | 28th May 2014 |
| 2605:78c0::/32 | 4.3B × /64 | ARIN | US | 5th Nov 2019 |
| 2605:7a00::/32 | 4.3B × /64 | ARIN | US | 5th Jan 2011 |
| 2605:7a40::/32 | 4.3B × /64 | ARIN | US | 6th Nov 2019 |
| 2605:7a80::/32 | 4.3B × /64 | ARIN |  VG | 23rd Mar 2026 |
| 2605:7ac0::/32 | 4.3B × /64 | ARIN | US | 11th Nov 2019 |
| 2605:7cc0::/32 | 4.3B × /64 | ARIN | US | 20th Nov 2019 |
| 2605:7dc0::/32 | 4.3B × /64 | ARIN | US | 22nd Nov 2019 |
| 2605:7e40::/32 | 4.3B × /64 | ARIN |  CA | 22nd Nov 2019 |
| 2605:7ec0::/32 | 4.3B × /64 | ARIN | US | 22nd Nov 2019 |
| 2605:7f00::/32 | 4.3B × /64 | ARIN | US | 24th Mar 2026 |
| 2605:8040::/32 | 4.3B × /64 | ARIN | CA | 26th Nov 2019 |
| 2605:8080::/36 | 268M × /64 | ARIN | US | 5th Jun 2014 |
| 2605:8140::/32 | 4.3B × /64 | ARIN | US | 4th Dec 2019 |
| 2605:81c0::/32 | 4.3B × /64 | ARIN | US | 10th Dec 2019 |
| 2605:82c0::/32 | 4.3B × /64 | ARIN | US | 10th Dec 2019 |
| 2605:840::/32 | 4.3B × /64 | ARIN | US | 5th Nov 2018 |
| 2605:8440::/32 | 4.3B × /64 | ARIN | US | 10th Dec 2019 |
| 2605:8500::/32 | 4.3B × /64 | ARIN | US | 27th Jul 2011 |
| 2605:8540::/32 | 4.3B × /64 | ARIN | US | 12th Dec 2019 |
| 2605:8580::/32 | 4.3B × /64 | ARIN | US | 11th Jun 2014 |
| 2605:85c0::/32 | 4.3B × /64 | ARIN | US | 13th Dec 2019 |
| 2605:8640::/32 | 4.3B × /64 | ARIN | CA | 17th Dec 2019 |
| 2605:8680::/28 | 68.7B × /64 | ARIN | US | 17th Jun 2014 |
| 2605:86c0::/32 | 4.3B × /64 | ARIN | US | 17th Dec 2019 |
| 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 |
| 2605:8c0::/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 |
| 2605:9140::/32 | 4.3B × /64 | ARIN | US | 9th Jan 2020 |
| 2605:9200::/32 | 4.3B × /64 | ARIN | US | 7th Jan 2011 |
| 2605:9340::/32 | 4.3B × /64 | ARIN | CA | 13th Jan 2020 |