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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 2620:1d:8000::/48 | 65.5k × /64 | ARIN | 18th Apr 2011 | |
| 2620:1d::/44 | 1M × /64 | ARIN | 27th Dec 2010 | |
| 2620:1d:e000::/48 | 65.5k × /64 | ARIN | 5th May 2017 | |
| 2620:1da::/36 | 268M × /64 | ARIN | 4th May 2016 | |
| 2620:1db::/36 | 268M × /64 | ARIN | 24th May 2016 | |
| 2620:1dc::/36 | 268M × /64 | ARIN | 24th Jun 2016 | |
| 2620:1dd::/36 | 268M × /64 | ARIN | 12th Jul 2016 | |
| 2620:1de::/36 | 268M × /64 | ARIN | 19th Jul 2016 | |
| 2620:1e2::/36 | 268M × /64 | ARIN | 18th Jul 2014 | |
| 2620:1e3::/36 | 268M × /64 | ARIN | 21st Aug 2014 | |
| 2620:1e4::/32 | 4.3B × /64 | ARIN | 13th Oct 2014 | |
| 2620:1e7::/36 | 268M × /64 | ARIN | 26th Nov 2014 | |
| 2620:1e9::/36 | 268M × /64 | ARIN | 8th Jan 2015 | |
| 2620:1e:4000::/48 | 65.5k × /64 | ARIN | 19th Mar 2013 | |
| 2620:1e:6000::/48 | 65.5k × /64 | ARIN | 8th May 2017 | |
| 2620:1e:8000::/48 | 65.5k × /64 | ARIN | 18th Apr 2011 | |
| 2620:1e:c000::/48 | 65.5k × /64 | ARIN | 21st Mar 2013 | |
| 2620:1ea::/36 | 268M × /64 | ARIN | 4th Feb 2015 | |
| 2620:1eb::/36 | 268M × /64 | ARIN | 26th Feb 2015 | |
| 2620:1ef::/36 | 268M × /64 | ARIN | 10th Sept 2015 | |
| 2620:1f0::/32 | 4.3B × /64 | ARIN | 6th Apr 2012 | |
| 2620:1f1::/36 | 268M × /64 | ARIN | 18th Sept 2013 | |
| 2620:1f2::/32 | 4.3B × /64 | ARIN | 25th Sept 2013 | |
| 2620:1f3::/32 | 4.3B × /64 | ARIN | 19th Nov 2013 | |
| 2620:1f4::/36 | 268M × /64 | ARIN | 9th Dec 2013 | |
| 2620:1f5::/36 | 268M × /64 | ARIN | 13th Jan 2014 | |
| 2620:1f:2000::/48 | 65.5k × /64 | ARIN | 11th May 2017 | |
| 2620:1f:6000::/48 | 65.5k × /64 | ARIN | 17th May 2017 | |
| 2620:1f:c000::/48 | 65.5k × /64 | ARIN | 25th Mar 2013 | |
| 2620:1f:e000::/48 | 65.5k × /64 | ARIN | 23rd May 2017 | |
| 2620:1fa::/32 | 4.3B × /64 | ARIN | 8th Apr 2014 | |
| 2620:1fd::/36 | 268M × /64 | ARIN | 19th May 2014 | |
| 2620:1fe::/36 | 268M × /64 | ARIN | 22nd May 2014 | |
| 2620:20:2000::/48 | 65.5k × /64 | ARIN | 24th May 2017 | |
| 2620:20:4000::/48 | 65.5k × /64 | ARIN | 28th Mar 2013 | |
| 2620:20:6000::/48 | 65.5k × /64 | ARIN | 24th May 2017 | |
| 2620:20::/48 | 65.5k × /64 | ARIN | 3rd Feb 2010 | |
| 2620:20:a000::/48 | 65.5k × /64 | ARIN | 30th May 2017 | |
| 2620:20:c000::/48 | 65.5k × /64 | ARIN | 8th Apr 2013 | |
| 2620:21:2000::/48 | 65.5k × /64 | ARIN | 31st May 2017 | |
| 2620:21:4000::/48 | 65.5k × /64 | ARIN | 9th Apr 2013 | |
| 2620:21:6000::/44 | 1M × /64 | ARIN | 5th Jun 2017 | |
| 2620:21:8000::/48 | 65.5k × /64 | ARIN | 21st Apr 2011 | |
| 2620:21::/48 | 65.5k × /64 | ARIN | 15th May 2026 | |
| 2620:21:a000::/48 | 65.5k × /64 | ARIN | 5th Jun 2017 | |
| 2620:21:e000::/48 | 65.5k × /64 | ARIN | 29th May 2026 | |
| 2620:22:2000::/48 | 65.5k × /64 | ARIN | 7th Jun 2017 | |
| 2620:22:6000::/48 | 65.5k × /64 | ARIN | 7th Jun 2017 | |
| 2620:22:a000::/48 | 65.5k × /64 | ARIN | 8th Jun 2017 | |
| 2620:22:c000::/48 | 65.5k × /64 | ARIN | 12th Apr 2013 |