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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 2620:2c:c040::/48 | 65.5k × /64 | ARIN | 30th Mar 2016 | |
| 2620:2d:2000::/48 | 65.5k × /64 | ARIN | 4th Aug 2017 | |
| 2620:2d:8000::/48 | 65.5k × /64 | ARIN | 2nd May 2011 | |
| 2620:2d:c000::/44 | 1M × /64 | ARIN | 4th Jun 2013 | |
| 2620:2e::/42 | 4.2M × /64 | ARIN | 29th Jun 2010 | |
| 2620:2e:c040::/48 | 65.5k × /64 | ARIN | 21st Aug 2026 | |
| 2620:2f:4000::/48 | 65.5k × /64 | ARIN | 11th Jun 2013 | |
| 2620:2f:8000::/48 | 65.5k × /64 | ARIN | 3rd May 2011 | |
| 2620:2f:a000::/48 | 65.5k × /64 | ARIN | 14th Aug 2017 | |
| 2620:2f:c000::/48 | 65.5k × /64 | ARIN | 11th Jun 2013 | |
| 2620:2f:e000::/48 | 65.5k × /64 | ARIN | 15th Aug 2017 | |
| 2620:30:2000::/48 | 65.5k × /64 | ARIN | 18th Aug 2017 | |
| 2620:30:4000::/48 | 65.5k × /64 | ARIN | 12th Jun 2013 | |
| 2620:30:6000::/48 | 65.5k × /64 | ARIN | 18th Aug 2017 | |
| 2620:31::/48 | 65.5k × /64 | ARIN | 10th Jan 2011 | |
| 2620:31:a000::/48 | 65.5k × /64 | ARIN | 28th Aug 2017 | |
| 2620:31:c000::/48 | 65.5k × /64 | ARIN | 21st Jun 2013 | |
| 2620:31:e000::/48 | 65.5k × /64 | ARIN | 29th Aug 2017 | |
| 2620:32:a000::/48 | 65.5k × /64 | ARIN | 7th Sept 2017 | |
| 2620:32:c000::/44 | 1M × /64 | ARIN | 1st Jul 2013 | |
| 2620:33:2000::/48 | 65.5k × /64 | ARIN | 5th Jun 2026 | |
| 2620:33:4000::/44 | 1M × /64 | ARIN | 1st Jul 2013 | |
| 2620:33:8000::/48 | 65.5k × /64 | ARIN | 4th May 2011 | |
| 2620:33::/48 | 65.5k × /64 | ARIN | 11th Jan 2011 | |
| 2620:33:a000::/44 | 1M × /64 | ARIN | 21st Sept 2017 | |
| 2620:33:c000::/48 | 65.5k × /64 | ARIN | 1st Jul 2013 | |
| 2620:34:6000::/44 | 1M × /64 | ARIN | 21st Sept 2017 | |
| 2620:34:8000::/48 | 65.5k × /64 | ARIN | 4th May 2011 | |
| 2620:34::/48 | 65.5k × /64 | ARIN | 21st Apr 2010 | |
| 2620:35:4000::/44 | 1M × /64 | ARIN | 10th Jul 2013 | |
| 2620:35:a000::/48 | 65.5k × /64 | ARIN | 15th Jun 2026 | |
| 2620:35:c000::/44 | 1M × /64 | ARIN | 16th Jul 2013 | |
| 2620:36:4000::/44 | 1M × /64 | ARIN | 17th Jul 2013 | |
| 2620:36::/48 | 65.5k × /64 | ARIN | 27th Dec 2011 | |
| 2620:37:2000::/48 | 65.5k × /64 | ARIN | 5th Oct 2017 | |
| 2620:37:4000::/44 | 1M × /64 | ARIN | 23rd Jul 2013 | |
| 2620:37:8000::/48 | 65.5k × /64 | ARIN | 24th Jan 2012 | |
| 2620:37::/48 | 65.5k × /64 | ARIN | 11th Jan 2011 | |
| 2620:38:4000::/44 | 1M × /64 | ARIN | 26th Jul 2013 | |
| 2620:38:8000::/48 | 65.5k × /64 | ARIN | 10th May 2011 | |
| 2620:38::/48 | 65.5k × /64 | ARIN | 16th Mar 2010 | |
| 2620:38:a000::/48 | 65.5k × /64 | ARIN | 10th Oct 2017 | |
| 2620:39:2000::/48 | 65.5k × /64 | ARIN | 12th Oct 2017 | |
| 2620:39:4000::/48 | 65.5k × /64 | ARIN | 31st Jul 2013 | |
| 2620:39:8000::/48 | 65.5k × /64 | ARIN | 11th May 2011 | |
| 2620:39::/44 | 1M × /64 | ARIN | 14th Jan 2011 | |
| 2620:39:a000::/48 | 65.5k × /64 | ARIN | 19th Oct 2017 | |
| 2620:3:2000::/48 | 65.5k × /64 | ARIN | 19th Jul 2016 | |
| 2620:3:6000::/48 | 65.5k × /64 | ARIN | 19th Jul 2016 | |
| 2620:3:8000::/48 | 65.5k × /64 | ARIN | 1st Apr 2011 |