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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,124 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2a03:1580::/32 | 4.3B × /64 | RIPE NCC | 12th Aug 2011 | |
| 2a03:15c0::/32 | 4.3B × /64 | RIPE NCC | 12th Oct 2012 | |
| 2a03:160::/32 | 4.3B × /64 | RIPE NCC | 30th Jun 2014 | |
| 2a03:1620::/32 | 4.3B × /64 | RIPE NCC | 23rd Jul 2014 | |
| 2a03:1660::/32 | 4.3B × /64 | RIPE NCC | 23rd Jul 2014 | |
| 2a03:1680::/32 | 4.3B × /64 | RIPE NCC | 12th Aug 2011 | |
| 2a03:16c0::/32 | 4.3B × /64 | RIPE NCC | 12th Oct 2012 | |
| 2a03:1700::/29 | 34.4B × /64 | RIPE NCC | 25th Mar 2011 | |
| 2a03:1740::/32 | 4.3B × /64 | RIPE NCC | 12th Oct 2012 | |
| 2a03:1760::/32 | 4.3B × /64 | RIPE NCC | 24th Jul 2014 | |
| 2a03:1780::/32 | 4.3B × /64 | RIPE NCC | 12th Aug 2011 | |
| 2a03:17a0::/32 | 4.3B × /64 | RIPE NCC | 24th Jul 2014 | |
| 2a03:1800::/32 | 4.3B × /64 | RIPE NCC | 15th Dec 2010 | |
| 2a03:180::/32 | 4.3B × /64 | RIPE NCC | 4th Aug 2011 | |
| 2a03:1820::/32 | 4.3B × /64 | RIPE NCC | 25th Jul 2014 | |
| 2a03:18a0::/32 | 4.3B × /64 | RIPE NCC | 25th Jul 2014 | |
| 2a03:1900::/29 | 34.4B × /64 | RIPE NCC | 25th Mar 2011 | |
| 2a03:1920::/32 | 4.3B × /64 | RIPE NCC | 28th Jul 2014 | |
| 2a03:1940::/32 | 4.3B × /64 | RIPE NCC | 12th Oct 2012 | |
| 2a03:1960::/32 | 4.3B × /64 | RIPE NCC | 28th Jul 2014 | |
| 2a03:19e0::/32 | 4.3B × /64 | RIPE NCC | 28th Jul 2014 | |
| 2a03:1a0::/32 | 4.3B × /64 | RIPE NCC | 30th Jun 2014 | |
| 2a03:1a20::/32 | 4.3B × /64 | RIPE NCC | 29th Jul 2014 | |
| 2a03:1a40::/32 | 4.3B × /64 | RIPE NCC | 12th Oct 2012 | |
| 2a03:1b60::/32 | 4.3B × /64 | RIPE NCC | 29th Jul 2014 | |
| 2a03:1be0::/32 | 4.3B × /64 | RIPE NCC | 29th Jul 2014 | |
| 2a03:1c00::/29 | 34.4B × /64 | RIPE NCC | 10th Jan 2011 | |
| 2a03:1c20::/32 | 4.3B × /64 | RIPE NCC | 30th Jul 2014 | |
| 2a03:1c40::/32 | 4.3B × /64 | RIPE NCC | 15th Oct 2012 | |
| 2a03:1ca0::/32 | 4.3B × /64 | RIPE NCC | 30th Jul 2014 | |
| 2a03:1cc0::/32 | 4.3B × /64 | RIPE NCC | 15th Oct 2012 | |
| 2a03:1ce0::/32 | 4.3B × /64 | RIPE NCC | 31st Jul 2014 | |
| 2a03:1d00::/32 | 4.3B × /64 | RIPE NCC | 28th Mar 2011 | |
| 2a03:1da0::/29 | 34.4B × /64 | RIPE NCC | 31st Jul 2014 | |
| 2a03:1de0::/32 | 4.3B × /64 | RIPE NCC | 1st Aug 2014 | |
| 2a03:1e0::/32 | 4.3B × /64 | RIPE NCC | 30th Jun 2014 | |
| 2a03:1e60::/32 | 4.3B × /64 | RIPE NCC | 15th Sept 2015 | |
| 2a03:1ea0::/29 | 34.4B × /64 | RIPE NCC | 4th Aug 2014 | |
| 2a03:1ec0::/32 | 4.3B × /64 | RIPE NCC | 16th Oct 2012 | |
| 2a03:1f00::/32 | 4.3B × /64 | RIPE NCC | 28th Mar 2011 | |
| 2a03:1f20::/32 | 4.3B × /64 | RIPE NCC | 4th Aug 2014 | |
| 2a03:2000::/32 | 4.3B × /64 | RIPE NCC | 2nd Dec 2010 | |
| 2a03:200::/32 | 4.3B × /64 | RIPE NCC | 3rd Feb 2011 | |
| 2a03:20a0::/32 | 4.3B × /64 | RIPE NCC | 7th Aug 2014 | |
| 2a03:20e0::/32 | 4.3B × /64 | RIPE NCC | 7th Aug 2014 | |
| 2a03:2120::/32 | 4.3B × /64 | RIPE NCC | 7th Aug 2014 | |
| 2a03:2140::/32 | 4.3B × /64 | RIPE NCC | 17th Oct 2012 | |
| 2a03:2160::/32 | 4.3B × /64 | RIPE NCC | 7th Aug 2014 | |
| 2a03:2180::/32 | 4.3B × /64 | RIPE NCC | 18th Aug 2011 | |
| 2a03:21a0::/32 | 4.3B × /64 | RIPE NCC | 7th Aug 2014 |