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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,502 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2a00:f880::/32 | 4.3B × /64 | RIPE NCC |  GB | 1st Jun 2011 |
| 2a00:f8e0::/32 | 4.3B × /64 | RIPE NCC |  DE | 14th Oct 2013 |
| 2a00:f90::/32 | 4.3B × /64 | RIPE NCC |  CH | 4th Dec 2008 |
| 2a00:f98::/32 | 4.3B × /64 | RIPE NCC |  SE | 4th Dec 2008 |
| 2a00:f9e0::/32 | 4.3B × /64 | RIPE NCC |  TR | 15th Oct 2013 |
| 2a00:fa20::/32 | 4.3B × /64 | RIPE NCC |  RU | 15th Oct 2013 |
| 2a00:faa0::/32 | 4.3B × /64 | RIPE NCC |  IE | 15th Oct 2013 |
| 2a00:fae0::/32 | 4.3B × /64 | RIPE NCC |  IL | 6th Jul 2015 |
| 2a00:fca0::/32 | 4.3B × /64 | RIPE NCC |  UA | 17th Oct 2013 |
| 2a00:fce0::/32 | 4.3B × /64 | RIPE NCC | GB | 17th Oct 2013 |
| 2a00:fd0::/32 | 4.3B × /64 | RIPE NCC | GB | 11th Dec 2008 |
| 2a00:fd60::/32 | 4.3B × /64 | RIPE NCC | GB | 18th Oct 2013 |
| 2a00:fe40::/32 | 4.3B × /64 | RIPE NCC |  ES | 16th May 2012 |
| 2a00:fe60::/32 | 4.3B × /64 | RIPE NCC |  FI | 21st Oct 2013 |
| 2a00:fec0::/32 | 4.3B × /64 | RIPE NCC | TR | 18th May 2012 |
| 2a00:ff00::/29 | 34.4B × /64 | RIPE NCC | CH | 24th Feb 2011 |
| 2a00:ff60::/32 | 4.3B × /64 | RIPE NCC | GB | 21st Oct 2013 |
| 2a00:ff8::/29 | 34.4B × /64 | RIPE NCC |  IR | 16th Dec 2008 |
| 2a00:ffc0::/32 | 4.3B × /64 | RIPE NCC |  PL | 18th May 2012 |
| 2a00:ffe0::/32 | 4.3B × /64 | RIPE NCC | GB | 21st Oct 2013 |
| 2a01:140::/29 | 34.4B × /64 | RIPE NCC | GB | 27th Jun 2006 |
| 2a01:150::/32 | 4.3B × /64 | RIPE NCC | GB | 10th Jul 2006 |
| 2a01:1a0::/29 | 34.4B × /64 | RIPE NCC | ES | 11th Aug 2006 |
| 2a01:1a8::/32 | 4.3B × /64 | RIPE NCC | GB | 14th Aug 2006 |
| 2a01:1e0::/32 | 4.3B × /64 | RIPE NCC | IE | 19th Sept 2006 |
| 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 |
| 2a01:3b0::/29 | 34.4B × /64 | RIPE NCC | SE | 13th Jun 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 |
| 2a01:428::/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 |