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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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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 |
|---|---|---|---|---|
| 2602:ff4f::/36 | 268M × /64 | ARIN | 22nd Mar 2016 | |
| 2602:ff53::/36 | 268M × /64 | ARIN | 4th Mar 2016 | |
| 2602:ff54::/36 | 268M × /64 | ARIN | 1st Mar 2016 | |
| 2602:ff55::/36 | 268M × /64 | ARIN | 23rd Feb 2016 | |
| 2602:ff5d::/36 | 268M × /64 | ARIN | 15th Jan 2016 | |
| 2602:ff60::/40 | 16.8M × /64 | ARIN | 28th Jan 2026 | |
| 2602:ff61::/36 | 268M × /64 | ARIN | 29th Dec 2015 | |
| 2602:ff66::/36 | 268M × /64 | ARIN | 9th Oct 2015 | |
| 2602:ff69::/36 | 268M × /64 | ARIN | 2nd Oct 2015 | |
| 2602:ff6b::/36 | 268M × /64 | ARIN | 28th Sept 2015 | |
| 2602:ff6d::/36 | 268M × /64 | ARIN | 14th Sept 2015 | |
| 2602:ff6f::/36 | 268M × /64 | ARIN | 1st Sept 2015 | |
| 2602:ff72::/36 | 268M × /64 | ARIN | 19th Aug 2015 | |
| 2602:ff73::/40 | 16.8M × /64 | ARIN | 28th Jan 2026 | |
| 2602:ff77::/36 | 268M × /64 | ARIN | 21st Jul 2015 | |
| 2602:ff78::/40 | 16.8M × /64 | ARIN | 2nd Feb 2026 | |
| 2602:ff7d::/36 | 268M × /64 | ARIN | 19th Jun 2015 | |
| 2602:ff80::/36 | 268M × /64 | ARIN | 4th Jun 2015 | |
| 2602:ff81::/36 | 268M × /64 | ARIN | 3rd Jun 2015 | |
| 2602:ff82::/36 | 268M × /64 | ARIN | 14th May 2015 | |
| 2602:ff8a::/36 | 268M × /64 | ARIN | 26th Mar 2015 | |
| 2602:ff8c::/36 | 268M × /64 | ARIN | 4th Mar 2015 | |
| 2602:ff8e::/32 | 4.3B × /64 | ARIN | 24th Feb 2015 | |
| 2602:ff90::/36 | 268M × /64 | ARIN | 23rd Feb 2015 | |
| 2602:ff91::/36 | 268M × /64 | ARIN | 17th Feb 2015 | |
| 2602:ff92::/36 | 268M × /64 | ARIN | 30th Jan 2015 | |
| 2602:ff9b::/36 | 268M × /64 | ARIN | 8th Dec 2014 | |
| 2602:ff9c::/36 | 268M × /64 | ARIN | 21st Nov 2014 | |
| 2602:ff9d::/36 | 268M × /64 | ARIN | 20th Nov 2014 | |
| 2602:ff9e::/40 | 16.8M × /64 | ARIN | 3rd Feb 2026 | |
| 2602:ff9f::/36 | 268M × /64 | ARIN | 11th Nov 2014 | |
| 2602:ffa3::/36 | 268M × /64 | ARIN | 30th Sept 2014 | |
| 2602:ffa8::/36 | 268M × /64 | ARIN | 10th Sept 2014 | |
| 2602:ffae::/36 | 268M × /64 | ARIN | 8th Aug 2014 | |
| 2602:ffb1::/36 | 268M × /64 | ARIN | 7th Jul 2014 | |
| 2602:ffb2::/36 | 268M × /64 | ARIN | 3rd Jul 2014 | |
| 2602:ffb4::/32 | 4.3B × /64 | ARIN | 24th Jun 2014 | |
| 2602:ffb9::/36 | 268M × /64 | ARIN | 11th Jun 2014 | |
| 2602:ffbe::/36 | 268M × /64 | ARIN | 20th May 2014 | |
| 2602:ffbf::/36 | 268M × /64 | ARIN | 3rd Feb 2026 | |
| 2602:ffc2::/36 | 268M × /64 | ARIN | 13th May 2014 | |
| 2602:ffc3::/36 | 268M × /64 | ARIN | 8th May 2014 | |
| 2602:ffc4::/36 | 268M × /64 | ARIN | 5th May 2014 | |
| 2602:ffc9::/36 | 268M × /64 | ARIN | 27th Mar 2014 | |
| 2602:ffcf::/36 | 268M × /64 | ARIN | 27th Jan 2014 | |
| 2602:ffd0::/36 | 268M × /64 | ARIN | 22nd Jan 2013 | |
| 2602:ffd7::/36 | 268M × /64 | ARIN | 4th Dec 2013 | |
| 2602:ffd8::/36 | 268M × /64 | ARIN | 18th Nov 2013 | |
| 2602:ffdb::/36 | 268M × /64 | ARIN | 7th Nov 2013 | |
| 2602:ffdc::/36 | 268M × /64 | ARIN | 6th Nov 2013 |