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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through ARIN, largest first.
Unannounced blocks in United States
26,289 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2602:f8dc::/40 | 16.8M × /64 | ARIN |  US | 28th May 2024 |
| 2602:f8dd::/40 | 16.8M × /64 | ARIN | US | 28th May 2024 |
| 2602:f8df::/40 | 16.8M × /64 | ARIN | US | 24th May 2024 |
| 2602:f8e0::/40 | 16.8M × /64 | ARIN | US | 24th May 2024 |
| 2602:f8e1::/40 | 16.8M × /64 | ARIN | US | 23rd May 2024 |
| 2602:f8e2::/40 | 16.8M × /64 | ARIN | US | 23rd May 2024 |
| 2602:f8e4::/40 | 16.8M × /64 | ARIN | US | 23rd May 2024 |
| 2602:f8e5::/40 | 16.8M × /64 | ARIN | US | 23rd May 2024 |
| 2602:f8e6::/40 | 16.8M × /64 | ARIN | US | 22nd May 2024 |
| 2602:f8e8::/40 | 16.8M × /64 | ARIN | US | 21st May 2024 |
| 2602:f8eb::/36 | 268M × /64 | ARIN | US | 17th May 2024 |
| 2602:f8ec::/40 | 16.8M × /64 | ARIN | US | 14th Jan 2026 |
| 2602:f8ed::/40 | 16.8M × /64 | ARIN | US | 16th May 2024 |
| 2602:f8f0::/36 | 268M × /64 | ARIN | US | 16th May 2024 |
| 2602:f8f2::/40 | 16.8M × /64 | ARIN | US | 13th May 2024 |
| 2602:f8f3::/40 | 16.8M × /64 | ARIN | US | 13th May 2024 |
| 2602:f8f5::/36 | 268M × /64 | ARIN | US | 10th May 2024 |
| 2602:f8f6::/40 | 16.8M × /64 | ARIN | US | 10th May 2024 |
| 2602:f8fc::/36 | 268M × /64 | ARIN | US | 6th May 2024 |
| 2602:f900::/40 | 16.8M × /64 | ARIN | US | 3rd May 2024 |
| 2602:f904::/40 | 16.8M × /64 | ARIN | US | 2nd May 2024 |
| 2602:f90d::/36 | 268M × /64 | ARIN | US | 25th Apr 2024 |
| 2602:f914::/40 | 16.8M × /64 | ARIN | US | 22nd Apr 2024 |
| 2602:f916::/40 | 16.8M × /64 | ARIN | US | 19th Apr 2024 |
| 2602:f917::/40 | 16.8M × /64 | ARIN | US | 15th May 2026 |
| 2602:f91b::/40 | 16.8M × /64 | ARIN | US | 17th Apr 2024 |
| 2602:f91c::/36 | 268M × /64 | ARIN | US | 17th Apr 2024 |
| 2602:f91f::/36 | 268M × /64 | ARIN | US | 11th Apr 2024 |
| 2602:f926::/36 | 268M × /64 | ARIN | US | 3rd Apr 2024 |
| 2602:f928::/40 | 16.8M × /64 | ARIN | US | 3rd Apr 2024 |
| 2602:f929::/36 | 268M × /64 | ARIN | US | 2nd Apr 2024 |
| 2602:f92e::/40 | 16.8M × /64 | ARIN | US | 2nd Apr 2024 |
| 2602:f92f::/40 | 16.8M × /64 | ARIN | US | 1st Apr 2024 |
| 2602:f930::/40 | 16.8M × /64 | ARIN | US | 1st Apr 2024 |
| 2602:f932::/40 | 16.8M × /64 | ARIN | US | 28th Mar 2024 |
| 2602:f934::/36 | 268M × /64 | ARIN | US | 22nd Mar 2024 |
| 2602:f935::/40 | 16.8M × /64 | ARIN | US | 22nd Mar 2024 |
| 2602:f936::/40 | 16.8M × /64 | ARIN | US | 21st Mar 2024 |
| 2602:f93c::/36 | 268M × /64 | ARIN | US | 18th Mar 2024 |
| 2602:f93e::/40 | 16.8M × /64 | ARIN | US | 15th Mar 2024 |
| 2602:f93f::/36 | 268M × /64 | ARIN | US | 15th Mar 2024 |
| 2602:f941::/40 | 16.8M × /64 | ARIN | US | 15th Mar 2024 |
| 2602:f944::/36 | 268M × /64 | ARIN | US | 14th Mar 2024 |
| 2602:f945::/40 | 16.8M × /64 | ARIN | US | 13th Mar 2024 |
| 2602:f948::/40 | 16.8M × /64 | ARIN | US | 12th Mar 2024 |
| 2602:f94b::/40 | 16.8M × /64 | ARIN | US | 11th Mar 2024 |
| 2602:f94d::/40 | 16.8M × /64 | ARIN | US | 7th Mar 2024 |
| 2602:f951::/40 | 16.8M × /64 | ARIN | US | 6th Mar 2024 |
| 2602:f955::/36 | 268M × /64 | ARIN | US | 4th Mar 2024 |
| 2602:f95e::/40 | 16.8M × /64 | ARIN | US | 28th Feb 2024 |