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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,221 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 193.134.88.0/22 | 1k | RIPE NCC |  CH | 28th May 1997 |
| 193.134.92.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.134.95.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.135.107.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.135.139.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.135.14.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.135.151.0/24 | 256 | RIPE NCC |  LT | 18th Nov 2019 |
| 193.135.154.0/23 | 512 | RIPE NCC | CH | 28th May 1997 |
| 193.135.158.0/23 | 512 | RIPE NCC | CH | 28th May 1997 |
| 193.135.16.0/22 | 1k | RIPE NCC | CH | 28th May 1997 |
| 193.135.160.0/23 | 512 | RIPE NCC | CH | 28th May 1997 |
| 193.135.175.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.135.176.0/20 | 4.1k | RIPE NCC | CH | 28th May 1997 |
| 193.135.192.0/20 | 4.1k | RIPE NCC | CH | 28th May 1997 |
| 193.135.208.0/22 | 1k | RIPE NCC | CH | 28th May 1997 |
| 193.135.212.0/23 | 512 | RIPE NCC | CH | 28th May 1997 |
| 193.135.22.0/23 | 512 | RIPE NCC | CH | 28th May 1997 |
| 193.135.224.0/20 | 4.1k | RIPE NCC | CH | 28th May 1997 |
| 193.135.248.0/22 | 1k | RIPE NCC | CH | 28th May 1997 |
| 193.135.25.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.135.31.0/24 | 256 | RIPE NCC | CH | 28th May 1997 |
| 193.135.32.0/21 | 2k | RIPE NCC | CH | 28th May 1997 |
| 193.135.4.0/22 | 1k | RIPE NCC | CH | 28th May 1997 |
| 193.135.60.0/22 | 1k | RIPE NCC | CH | 28th May 1997 |
| 193.138.100.0/24 | 256 | RIPE NCC |  NL | 27th Feb 2003 |
| 193.138.109.0/24 | 256 | RIPE NCC | NL | 12th Mar 2003 |
| 193.138.112.0/24 | 256 | RIPE NCC |  DE | 13th Mar 2003 |
| 193.138.124.0/24 | 256 | RIPE NCC |  DK | 24th Mar 2003 |
| 193.138.140.0/22 | 1k | RIPE NCC |  PL | 15th Nov 2004 |
| 193.138.16.0/21 | 2k | RIPE NCC | DE | 22nd Sept 1997 |
| 193.138.180.0/22 | 1k | RIPE NCC | DE | 26th Nov 2004 |
| 193.138.200.0/22 | 1k | RIPE NCC |  FI | 3rd Dec 2004 |
| 193.138.26.0/24 | 256 | RIPE NCC | DE | 22nd Sept 1997 |
| 193.138.3.0/24 | 256 | RIPE NCC |  SI | 10th Sept 1992 |
| 193.138.31.0/24 | 256 | RIPE NCC | DE | 4th Apr 2005 |
| 193.138.66.0/24 | 256 | RIPE NCC | DE | 7th Feb 2003 |
| 193.138.68.0/24 | 256 | RIPE NCC | DE | 7th Feb 2003 |
| 193.138.69.0/24 | 256 | RIPE NCC | CH | 7th Feb 2003 |
| 193.138.71.0/24 | 256 | RIPE NCC |  SE | 10th Feb 2003 |
| 193.138.76.0/24 | 256 | RIPE NCC | DK | 13th Feb 2003 |
| 193.138.83.0/24 | 256 | RIPE NCC | DE | 17th Feb 2003 |
| 193.138.95.0/24 | 256 | RIPE NCC |  GB | 24th Feb 2003 |
| 193.138.96.0/24 | 256 | RIPE NCC | DE | 25th Feb 2003 |
| 193.139.0.0/16 | 65.5k | RIPE NCC |  FR | 7th Oct 1992 |
| 193.141.140.0/23 | 512 | RIPE NCC |  US | 1st Sept 1993 |
| 193.141.177.0/24 | 256 | RIPE NCC | PL | 18th Nov 2019 |
| 193.142.110.0/24 | 256 | RIPE NCC |  NO | 12th Mar 2007 |
| 193.142.113.0/24 | 256 | RIPE NCC | PL | 15th Mar 2007 |
| 193.142.117.0/24 | 256 | RIPE NCC | FI | 18th Nov 2019 |
| 193.142.118.0/24 | 256 | RIPE NCC | GB | 16th Mar 2007 |