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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,195 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2a01:20::/32 | 4.3B × /64 | RIPE NCC |  FR | 3rd Feb 2006 |
| 2a01:210::/32 | 4.3B × /64 | RIPE NCC |  RU | 29th Jul 2010 |
| 2a01:220::/32 | 4.3B × /64 | RIPE NCC | RU | 27th Oct 2006 |
| 2a01:228::/32 | 4.3B × /64 | RIPE NCC |  CH | 27th Oct 2006 |
| 2a01:268::/32 | 4.3B × /64 | RIPE NCC |  IE | 6th Dec 2006 |
| 2a01:2a0::/32 | 4.3B × /64 | RIPE NCC | FR | 13th Feb 2007 |
| 2a01:2b8::/32 | 4.3B × /64 | RIPE NCC |  GR | 21st Feb 2007 |
| 2a01:2d0::/32 | 4.3B × /64 | RIPE NCC | CH | 14th Mar 2007 |
| 2a01:338::/32 | 4.3B × /64 | RIPE NCC |  PL | 23rd Apr 2007 |
| 2a01:38::/32 | 4.3B × /64 | RIPE NCC |  BE | 15th Feb 2006 |
| 2a01:3a8::/32 | 4.3B × /64 | RIPE NCC |  NL | 11th Jun 2007 |
| 2a01:3b0::/29 | 34.4B × /64 | RIPE NCC |  SE | 13th Jun 2007 |
| 2a01:408::/32 | 4.3B × /64 | RIPE NCC |  DE | 25th Jul 2007 |
| 2a01:4100::/32 | 4.3B × /64 | RIPE NCC |  ES | 15th Jun 2015 |
| 2a01:4140::/32 | 4.3B × /64 | RIPE NCC | ES | 17th Jun 2015 |
| 2a01:4160::/32 | 4.3B × /64 | RIPE NCC |  AL | 23rd Oct 2013 |
| 2a01:4180::/32 | 4.3B × /64 | RIPE NCC | DE | 17th Jun 2015 |
| 2a01:41c0::/32 | 4.3B × /64 | RIPE NCC | CH | 23rd May 2012 |
| 2a01:428::/32 | 4.3B × /64 | RIPE NCC |  GB | 9th Aug 2007 |
| 2a01:42a0::/32 | 4.3B × /64 | RIPE NCC | RU | 24th Oct 2013 |
| 2a01:4300::/32 | 4.3B × /64 | RIPE NCC | GB | 24th Feb 2011 |
| 2a01:4320::/32 | 4.3B × /64 | RIPE NCC | FR | 24th Oct 2013 |
| 2a01:4340::/32 | 4.3B × /64 | RIPE NCC | BE | 23rd May 2012 |
| 2a01:4380::/32 | 4.3B × /64 | RIPE NCC | RU | 6th Jun 2011 |
| 2a01:438::/32 | 4.3B × /64 | RIPE NCC | DE | 9th Aug 2007 |
| 2a01:43a0::/32 | 4.3B × /64 | RIPE NCC | BE | 24th Oct 2013 |
| 2a01:43c0::/32 | 4.3B × /64 | RIPE NCC |  IQ | 24th May 2012 |
| 2a01:4420::/32 | 4.3B × /64 | RIPE NCC | RU | 25th Oct 2013 |
| 2a01:44a0::/32 | 4.3B × /64 | RIPE NCC |  IT | 25th Oct 2013 |
| 2a01:44c0::/32 | 4.3B × /64 | RIPE NCC |  IS | 24th May 2012 |
| 2a01:44e0::/32 | 4.3B × /64 | RIPE NCC |  UA | 28th Oct 2013 |
| 2a01:4500::/32 | 4.3B × /64 | RIPE NCC |  PS | 25th Feb 2011 |
| 2a01:458::/32 | 4.3B × /64 | RIPE NCC |  IR | 14th Aug 2007 |
| 2a01:45e0::/32 | 4.3B × /64 | RIPE NCC | IT | 29th Oct 2013 |
| 2a01:4600::/32 | 4.3B × /64 | RIPE NCC |  BH | 28th Jan 2011 |
| 2a01:4620::/32 | 4.3B × /64 | RIPE NCC | FR | 17th Jun 2015 |
| 2a01:4660::/32 | 4.3B × /64 | RIPE NCC | PL | 29th Oct 2013 |
| 2a01:46a0::/32 | 4.3B × /64 | RIPE NCC |  SA | 29th Oct 2013 |
| 2a01:46e0::/32 | 4.3B × /64 | RIPE NCC | GB | 29th Oct 2013 |
| 2a01:4720::/32 | 4.3B × /64 | RIPE NCC | RU | 29th Oct 2013 |
| 2a01:4760::/29 | 34.4B × /64 | RIPE NCC | GB | 30th Oct 2013 |
| 2a01:478::/29 | 34.4B × /64 | RIPE NCC |  BA | 23rd Aug 2007 |
| 2a01:47a0::/32 | 4.3B × /64 | RIPE NCC |  GE | 30th Oct 2013 |
| 2a01:47e0::/32 | 4.3B × /64 | RIPE NCC | UA | 30th Oct 2013 |
| 2a01:4820::/32 | 4.3B × /64 | RIPE NCC | IE | 30th Oct 2013 |
| 2a01:4880::/32 | 4.3B × /64 | RIPE NCC | RU | 7th Jun 2011 |
| 2a01:48::/32 | 4.3B × /64 | RIPE NCC | ES | 24th Feb 2006 |
| 2a01:48e0::/32 | 4.3B × /64 | RIPE NCC | ES | 31st Oct 2013 |
| 2a01:4900::/29 | 34.4B × /64 | RIPE NCC | BH | 25th Feb 2011 |
| 2a01:4920::/32 | 4.3B × /64 | RIPE NCC | RU | 31st Oct 2013 |