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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
Browse by country
Countries with the most unannounced blocks, largest first.
Unannounced blocks
84,502 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2a01:5260::/32 | 4.3B × /64 | RIPE NCC |  RU | 19th Nov 2013 |
| 2a01:5280::/32 | 4.3B × /64 | RIPE NCC |  ES | 9th Jun 2011 |
| 2a01:52a0::/32 | 4.3B × /64 | RIPE NCC |  CH | 19th Nov 2013 |
| 2a01:530::/29 | 34.4B × /64 | RIPE NCC |  GB | 4th May 2010 |
| 2a01:5320::/32 | 4.3B × /64 | RIPE NCC |  PL | 20th Nov 2013 |
| 2a01:5380::/32 | 4.3B × /64 | RIPE NCC |  ZA | 9th Jun 2011 |
| 2a01:53a0::/32 | 4.3B × /64 | RIPE NCC | PL | 20th Nov 2013 |
| 2a01:5480::/32 | 4.3B × /64 | RIPE NCC |  GG | 9th Jun 2011 |
| 2a01:54c0::/32 | 4.3B × /64 | RIPE NCC |  NL | 4th Jun 2012 |
| 2a01:5500::/29 | 34.4B × /64 | RIPE NCC |  IR | 28th Feb 2011 |
| 2a01:55a0::/32 | 4.3B × /64 | RIPE NCC | RU | 21st Nov 2013 |
| 2a01:5660::/32 | 4.3B × /64 | RIPE NCC | CH | 21st Nov 2013 |
| 2a01:56a0::/32 | 4.3B × /64 | RIPE NCC | GB | 22nd Nov 2013 |
| 2a01:5720::/32 | 4.3B × /64 | RIPE NCC |  IT | 22nd Nov 2013 |
| 2a01:5780::/32 | 4.3B × /64 | RIPE NCC | ES | 10th Jun 2011 |
| 2a01:57c0::/29 | 34.4B × /64 | RIPE NCC |  CZ | 5th Jun 2012 |
| 2a01:5800::/32 | 4.3B × /64 | RIPE NCC |  UA | 10th Dec 2010 |
| 2a01:5820::/32 | 4.3B × /64 | RIPE NCC | GB | 19th Jun 2015 |
| 2a01:5840::/32 | 4.3B × /64 | RIPE NCC | IR | 6th Jun 2012 |
| 2a01:58e0::/32 | 4.3B × /64 | RIPE NCC |  IL | 22nd Jun 2015 |
| 2a01:5920::/32 | 4.3B × /64 | RIPE NCC | IT | 26th Nov 2013 |
| 2a01:5960::/32 | 4.3B × /64 | RIPE NCC |  BE | 26th Nov 2013 |
| 2a01:59a0::/29 | 34.4B × /64 | RIPE NCC | PL | 26th Nov 2013 |
| 2a01:59c0::/32 | 4.3B × /64 | RIPE NCC | GB | 7th Jun 2012 |
| 2a01:5a0::/32 | 4.3B × /64 | RIPE NCC | GB | 2nd Nov 2007 |
| 2a01:5a20::/32 | 4.3B × /64 | RIPE NCC |  IE | 23rd Jun 2015 |
| 2a01:5a40::/32 | 4.3B × /64 | RIPE NCC | RU | 7th Jun 2012 |
| 2a01:5a80::/32 | 4.3B × /64 | RIPE NCC |  US | 10th Jun 2011 |
| 2a01:5b00::/32 | 4.3B × /64 | RIPE NCC | GB | 21st Mar 2016 |
| 2a01:5b20::/32 | 4.3B × /64 | RIPE NCC | ES | 27th Nov 2013 |
| 2a01:5b60::/32 | 4.3B × /64 | RIPE NCC | GB | 27th Nov 2013 |
| 2a01:5ba0::/32 | 4.3B × /64 | RIPE NCC | GB | 27th Nov 2013 |
| 2a01:5c20::/32 | 4.3B × /64 | RIPE NCC | GB | 27th Nov 2013 |
| 2a01:5c60::/32 | 4.3B × /64 | RIPE NCC | NL | 28th Nov 2013 |
| 2a01:5c80::/32 | 4.3B × /64 | RIPE NCC | RU | 14th Jun 2011 |
| 2a01:5ca0::/32 | 4.3B × /64 | RIPE NCC |  KW | 28th Nov 2013 |
| 2a01:5ce0::/32 | 4.3B × /64 | RIPE NCC | GB | 29th Nov 2013 |
| 2a01:5d80::/32 | 4.3B × /64 | RIPE NCC |  BH | 14th Jun 2011 |
| 2a01:5d8::/29 | 34.4B × /64 | RIPE NCC | CH | 16th Dec 2008 |
| 2a01:5de0::/32 | 4.3B × /64 | RIPE NCC | GB | 29th Nov 2013 |
| 2a01:5e20::/29 | 34.4B × /64 | RIPE NCC |  BG | 29th Nov 2013 |
| 2a01:5e60::/32 | 4.3B × /64 | RIPE NCC |  AT | 29th Nov 2013 |
| 2a01:5e80::/32 | 4.3B × /64 | RIPE NCC |  DK | 14th Jun 2011 |
| 2a01:5ea0::/32 | 4.3B × /64 | RIPE NCC | RU | 2nd Dec 2013 |
| 2a01:5ee0::/32 | 4.3B × /64 | RIPE NCC | PL | 2nd Dec 2013 |
| 2a01:5f00::/32 | 4.3B × /64 | RIPE NCC | RU | 1st Mar 2011 |
| 2a01:5fa0::/32 | 4.3B × /64 | RIPE NCC | UA | 2nd Dec 2013 |
| 2a01:5fe0::/32 | 4.3B × /64 | RIPE NCC | ES | 3rd Dec 2013 |
| 2a01:6040::/32 | 4.3B × /64 | RIPE NCC | ES | 11th Jun 2012 |
| 2a01:6080::/32 | 4.3B × /64 | RIPE NCC | IT | 14th Jun 2011 |