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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,248 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2607:f628::/32 | 4.3B × /64 | ARIN |  US | 2nd Sept 2008 |
| 2607:f630::/32 | 4.3B × /64 | ARIN | US | 10th Sept 2008 |
| 2607:f638::/32 | 4.3B × /64 | ARIN | US | 18th Sept 2008 |
| 2607:f650::/32 | 4.3B × /64 | ARIN | US | 29th Sept 2008 |
| 2607:f660::/32 | 4.3B × /64 | ARIN | US | 8th Oct 2008 |
| 2607:f680::/32 | 4.3B × /64 | ARIN | US | 17th Oct 2008 |
| 2607:f688::/32 | 4.3B × /64 | ARIN | US | 20th Oct 2008 |
| 2607:f6a8::/32 | 4.3B × /64 | ARIN | US | 7th Nov 2008 |
| 2607:f6c8::/32 | 4.3B × /64 | ARIN | US | 17th Nov 2008 |
| 2607:f6d8::/32 | 4.3B × /64 | ARIN | US | 26th Nov 2008 |
| 2607:f6e8::/32 | 4.3B × /64 | ARIN | US | 26th Nov 2008 |
| 2607:f700::/32 | 4.3B × /64 | ARIN | US | 2nd Dec 2008 |
| 2607:f728::/32 | 4.3B × /64 | ARIN | US | 9th Dec 2008 |
| 2607:f760::/32 | 4.3B × /64 | ARIN | US | 31st Dec 2008 |
| 2607:f788::/32 | 4.3B × /64 | ARIN | US | 21st Jan 2009 |
| 2607:f7e8::/32 | 4.3B × /64 | ARIN | US | 9th Feb 2009 |
| 2607:f7f0::/32 | 4.3B × /64 | ARIN | US | 10th Feb 2009 |
| 2607:f80::/32 | 4.3B × /64 | ARIN | US | 9th Mar 2016 |
| 2607:f818::/32 | 4.3B × /64 | ARIN | US | 17th Feb 2009 |
| 2607:f828::/32 | 4.3B × /64 | ARIN | US | 19th Feb 2009 |
| 2607:f838::/32 | 4.3B × /64 | ARIN |  VI | 23rd Feb 2009 |
| 2607:f880::/32 | 4.3B × /64 | ARIN | US | 5th Mar 2009 |
| 2607:f888::/32 | 4.3B × /64 | ARIN | US | 6th Mar 2009 |
| 2607:f890::/32 | 4.3B × /64 | ARIN |  CA | 9th Mar 2009 |
| 2607:f8d0::/32 | 4.3B × /64 | ARIN | US | 30th Mar 2009 |
| 2607:f908::/32 | 4.3B × /64 | ARIN | US | 8th Apr 2009 |
| 2607:f910::/32 | 4.3B × /64 | ARIN | US | 9th Apr 2009 |
| 2607:f950::/32 | 4.3B × /64 | ARIN | US | 27th Apr 2009 |
| 2607:f9b0::/32 | 4.3B × /64 | ARIN | US | 5th May 2009 |
| 2607:f9b8::/32 | 4.3B × /64 | ARIN | US | 5th May 2009 |
| 2607:f9d8::/32 | 4.3B × /64 | ARIN | US | 6th May 2009 |
| 2607:fa28::/32 | 4.3B × /64 | ARIN | US | 11th May 2009 |
| 2607:fa68::/32 | 4.3B × /64 | ARIN | US | 20th May 2009 |
| 2607:fa90::/32 | 4.3B × /64 | ARIN | US | 21st May 2009 |
| 2607:faa8::/32 | 4.3B × /64 | ARIN | US | 22nd May 2009 |
| 2607:fab0::/32 | 4.3B × /64 | ARIN | US | 28th May 2009 |
| 2607:fab8::/32 | 4.3B × /64 | ARIN | US | 28th May 2009 |
| 2607:fac0::/32 | 4.3B × /64 | ARIN | US | 29th May 2009 |
| 2607:fae8::/32 | 4.3B × /64 | ARIN | US | 8th Jun 2009 |
| 2607:faf0::/32 | 4.3B × /64 | ARIN | US | 9th Jun 2009 |
| 2607:fb30::/32 | 4.3B × /64 | ARIN | US | 23rd Jun 2009 |
| 2607:fb38::/32 | 4.3B × /64 | ARIN | US | 24th Jun 2009 |
| 2607:fb48::/32 | 4.3B × /64 | ARIN | US | 24th Jun 2009 |
| 2607:fb70::/32 | 4.3B × /64 | ARIN | US | 7th Jul 2009 |
| 2607:fb88::/32 | 4.3B × /64 | ARIN | US | 13th Jul 2009 |
| 2607:fba0::/32 | 4.3B × /64 | ARIN | US | 14th Jul 2009 |
| 2607:fbb0::/32 | 4.3B × /64 | ARIN | US | 16th Jul 2009 |
| 2607:fbb8::/32 | 4.3B × /64 | ARIN | US | 20th Jul 2009 |
| 2607:fbf8::/32 | 4.3B × /64 | ARIN | US | 24th Jul 2009 |
| 2607:fc0::/32 | 4.3B × /64 | ARIN | US | 6th Dec 2022 |