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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 193.110.176.0/23 | 512 | RIPE NCC |  UA | 8th Jan 2002 |
| 193.110.20.0/22 | 1k | RIPE NCC |  CH | 9th Nov 2001 |
| 193.110.224.0/22 | 1k | RIPE NCC |  FI | 1st Feb 2002 |
| 193.110.64.0/22 | 1k | RIPE NCC | FI | 23rd Nov 2001 |
| 193.110.81.0/24 | 256 | RIPE NCC |  US | 11th Oct 2021 |
| 193.110.88.0/24 | 256 | RIPE NCC |  GB | 13th Dec 2001 |
| 193.111.14.0/23 | 512 | RIPE NCC |  FR | 19th Feb 2002 |
| 193.111.164.0/24 | 256 | RIPE NCC |  HR | 24th Apr 2002 |
| 193.111.192.0/23 | 512 | RIPE NCC |  SI | 26th Apr 2002 |
| 193.111.206.0/23 | 512 | RIPE NCC |  DE | 5th Jun 2002 |
| 193.111.232.0/24 | 256 | RIPE NCC |  RO | 15th May 2002 |
| 193.111.239.0/24 | 256 | RIPE NCC | UA | 22nd May 2002 |
| 193.111.36.0/24 | 256 | RIPE NCC |  PL | 5th Mar 2002 |
| 193.111.4.0/23 | 512 | RIPE NCC |  SC | 11th Oct 2019 |
| 193.111.41.0/24 | 256 | RIPE NCC | PL | 8th Mar 2002 |
| 193.111.44.0/24 | 256 | RIPE NCC | DE | 12th Mar 2002 |
| 193.111.68.0/23 | 512 | RIPE NCC | RO | 24th Nov 2005 |
| 193.111.81.0/24 | 256 | RIPE NCC |  NL | 22nd Mar 2002 |
| 193.111.84.0/24 | 256 | RIPE NCC |  ES | 3rd Apr 2002 |
| 193.114.160.0/19 | 8.2k | RIPE NCC | GB | 10th Feb 1994 |
| 193.118.176.0/21 | 2k | RIPE NCC | GB | 10th Feb 1994 |
| 193.118.184.0/22 | 1k | RIPE NCC | GB | 10th Feb 1994 |
| 193.118.188.0/23 | 512 | RIPE NCC | GB | 10th Feb 1994 |
| 193.118.190.0/24 | 256 | RIPE NCC | GB | 10th Feb 1994 |
| 193.118.191.0/24 | 256 | RIPE NCC | GB | 10th Feb 1994 |
| 193.124.116.0/24 | 256 | RIPE NCC |  RU | 1st Sept 1993 |
| 193.124.122.0/23 | 512 | RIPE NCC |  SY | 1st Sept 1993 |
| 193.124.126.0/23 | 512 | RIPE NCC | SY | 1st Sept 1993 |
| 193.124.134.0/24 | 256 | RIPE NCC | RU | 1st Sept 1993 |
| 193.124.152.0/22 | 1k | RIPE NCC | SY | 1st Sept 1993 |
| 193.124.156.0/23 | 512 | RIPE NCC | SY | 1st Sept 1993 |
| 193.124.158.0/23 | 512 | RIPE NCC |  CZ | 1st Sept 1993 |
| 193.124.228.0/22 | 1k | RIPE NCC | SY | 1st Sept 1993 |
| 193.124.232.0/21 | 2k | RIPE NCC | SY | 1st Sept 1993 |
| 193.124.252.0/23 | 512 | RIPE NCC | SY | 1st Sept 1993 |
| 193.124.30.0/24 | 256 | RIPE NCC | CZ | 1st Sept 1993 |
| 193.124.48.0/24 | 256 | RIPE NCC | RU | 1st Sept 1993 |
| 193.124.54.0/24 | 256 | RIPE NCC | RU | 1st Sept 1993 |
| 193.124.55.0/24 | 256 | RIPE NCC | CZ | 1st Sept 1993 |
| 193.128.192.0/20 | 4.1k | RIPE NCC | GB | 14th Oct 1993 |
| 193.128.31.0/24 | 256 | RIPE NCC | GB | 14th Oct 1993 |
| 193.128.76.0/24 | 256 | RIPE NCC | GB | 14th Oct 1993 |
| 193.130.40.0/23 | 512 | RIPE NCC | GB | 14th Oct 1993 |
| 193.132.116.0/22 | 1k | RIPE NCC | GB | 4th Jul 1994 |
| 193.134.102.0/23 | 512 | RIPE NCC | CH | 28th May 1997 |
| 193.134.224.0/20 | 4.1k | RIPE NCC | CH | 28th May 1997 |
| 193.134.40.0/22 | 1k | RIPE NCC | CH | 28th May 1997 |
| 193.134.44.0/22 | 1k | RIPE NCC | CH | 28th May 1997 |
| 193.134.48.0/20 | 4.1k | RIPE NCC | CH | 28th May 1997 |
| 193.134.80.0/21 | 2k | RIPE NCC | CH | 28th May 1997 |