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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 2610:40::/32 | 4.3B × /64 | ARIN | 17th Feb 2006 | |
| 2610:50::/32 | 4.3B × /64 | ARIN | 14th Mar 2006 | |
| 2610:58::/32 | 4.3B × /64 | ARIN | 24th Mar 2006 | |
| 2610:78::/32 | 4.3B × /64 | ARIN | 19th May 2006 | |
| 2610:88::/32 | 4.3B × /64 | ARIN | 13th Jun 2006 | |
| 2610:a0::/32 | 4.3B × /64 | ARIN | 21st Jun 2006 | |
| 2610:a2::/31 | 8.6B × /64 | ARIN | 21st Jun 2006 | |
| 2610:a4::/30 | 17.2B × /64 | ARIN | 21st Jun 2006 | |
| 2610:b8::/32 | 4.3B × /64 | ARIN | 1st Aug 2006 | |
| 2610:c0::/32 | 4.3B × /64 | ARIN | 7th Aug 2006 | |
| 2610:c8::/32 | 4.3B × /64 | ARIN | 16th Feb 2010 | |
| 2610:d0::/32 | 4.3B × /64 | ARIN | 9th May 2008 | |
| 2620:0:100::/48 | 65.5k × /64 | ARIN | 21st Nov 2006 | |
| 2620:0:110::/48 | 65.5k × /64 | ARIN | 1st Dec 2006 | |
| 2620:0:1400::/42 | 4.2M × /64 | ARIN | 20th Oct 2008 | |
| 2620:0:140::/48 | 65.5k × /64 | ARIN | 15th Dec 2006 | |
| 2620:0:1500::/41 | 8.4M × /64 | ARIN | 30th Oct 2008 | |
| 2620:0:160::/48 | 65.5k × /64 | ARIN | 27th Dec 2006 | |
| 2620:0:1700::/44 | 1M × /64 | ARIN | 11th Nov 2008 | |
| 2620:0:170::/48 | 65.5k × /64 | ARIN | 28th Dec 2006 | |
| 2620:0:1800::/43 | 2.1M × /64 | ARIN | 20th Nov 2008 | |
| 2620:0:1a00::/48 | 65.5k × /64 | ARIN | 11th Mar 2009 | |
| 2620:0:1a0::/48 | 65.5k × /64 | ARIN | 11th Jan 2007 | |
| 2620:0:1a20::/48 | 65.5k × /64 | ARIN | 13th Mar 2009 | |
| 2620:0:1a30::/48 | 65.5k × /64 | ARIN | 18th Mar 2009 | |
| 2620:0:1a40::/48 | 65.5k × /64 | ARIN | 23rd Mar 2009 | |
| 2620:0:1a50::/48 | 65.5k × /64 | ARIN | 23rd Mar 2009 | |
| 2620:0:1a80::/48 | 65.5k × /64 | ARIN | 2nd Apr 2009 | |
| 2620:0:1ab0::/48 | 65.5k × /64 | ARIN | 8th Apr 2009 | |
| 2620:0:1ac0::/48 | 65.5k × /64 | ARIN | 15th Apr 2009 | |
| 2620:0:1ad0::/45 | 524k × /64 | ARIN | 20th Apr 2009 | |
| 2620:0:1ae0::/48 | 65.5k × /64 | ARIN | 27th Apr 2009 | |
| 2620:0:1b0::/48 | 65.5k × /64 | ARIN | 16th Dec 2008 | |
| 2620:0:1c0::/48 | 65.5k × /64 | ARIN | 17th Jan 2007 | |
| 2620:0:1d0::/48 | 65.5k × /64 | ARIN | 25th Jan 2007 | |
| 2620:0:1f0::/48 | 65.5k × /64 | ARIN | 29th Jan 2007 | |
| 2620:0:2000::/42 | 4.2M × /64 | ARIN | 23rd Mar 2009 | |
| 2620:0:200::/48 | 65.5k × /64 | ARIN | 1st Feb 2007 | |
| 2620:0:20::/48 | 65.5k × /64 | ARIN | 13th Sept 2006 | |
| 2620:0:220::/48 | 65.5k × /64 | ARIN | 7th Feb 2007 | |
| 2620:0:2210::/48 | 65.5k × /64 | ARIN | 4th May 2009 | |
| 2620:0:2240::/48 | 65.5k × /64 | ARIN | 18th May 2009 | |
| 2620:0:2290::/48 | 65.5k × /64 | ARIN | 3rd Jun 2009 | |
| 2620:0:22a0::/48 | 65.5k × /64 | ARIN | 9th Jun 2009 | |
| 2620:0:22c0::/48 | 65.5k × /64 | ARIN | 16th Jun 2009 | |
| 2620:0:22d0::/48 | 65.5k × /64 | ARIN | 22nd Jun 2009 | |
| 2620:0:22e0::/48 | 65.5k × /64 | ARIN | 22nd Jun 2009 | |
| 2620:0:2300::/44 | 1M × /64 | ARIN | 3rd Jun 2009 | |
| 2620:0:230::/48 | 65.5k × /64 | ARIN | 13th Feb 2007 | |
| 2620:0:2400::/40 | 16.8M × /64 | ARIN | 1st May 2009 |