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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 193.0.229.0/24 | 256 | RIPE NCC |  LV | 12th Nov 2019 |
| 193.0.238.0/24 | 256 | RIPE NCC |  DE | 6th Aug 2002 |
| 193.0.249.0/24 | 256 | RIPE NCC |  US | 15th Aug 2002 |
| 193.0.250.0/24 | 256 | RIPE NCC | DE | 16th Aug 2002 |
| 193.0.32.0/20 | 4.1k | RIPE NCC |  CH | 8th Jan 1998 |
| 193.0.48.0/21 | 2k | RIPE NCC | CH | 8th Jan 1998 |
| 193.100.228.0/22 | 1k | RIPE NCC |  SE | 15th Feb 1994 |
| 193.100.254.0/24 | 256 | RIPE NCC | DE | 15th Feb 1994 |
| 193.100.255.0/24 | 256 | RIPE NCC | DE | 15th Feb 1994 |
| 193.101.144.0/22 | 1k | RIPE NCC | DE | 15th Feb 1994 |
| 193.101.176.0/23 | 512 | RIPE NCC | DE | 15th Feb 1994 |
| 193.101.178.0/24 | 256 | RIPE NCC | DE | 15th Feb 1994 |
| 193.101.192.0/22 | 1k | RIPE NCC | DE | 15th Feb 1994 |
| 193.101.67.0/24 | 256 | RIPE NCC | DE | 15th Feb 1994 |
| 193.102.152.0/24 | 256 | RIPE NCC | DE | 15th May 1994 |
| 193.102.226.0/24 | 256 | RIPE NCC | DE | 15th May 1994 |
| 193.102.77.0/24 | 256 | RIPE NCC | DE | 15th May 1994 |
| 193.102.98.0/24 | 256 | RIPE NCC | DE | 15th May 1994 |
| 193.103.159.0/24 | 256 | RIPE NCC | DE | 27th Sept 1994 |
| 193.103.160.0/23 | 512 | RIPE NCC | DE | 27th Sept 1994 |
| 193.103.4.0/22 | 1k | RIPE NCC | DE | 27th Sept 1994 |
| 193.103.8.0/21 | 2k | RIPE NCC | DE | 27th Sept 1994 |
| 193.104.100.0/24 | 256 | RIPE NCC | SE | 2nd Nov 2009 |
| 193.104.105.0/24 | 256 | RIPE NCC |  NO | 3rd Nov 2009 |
| 193.104.106.0/24 | 256 | RIPE NCC |  RO | 15th Aug 2011 |
| 193.104.122.0/24 | 256 | RIPE NCC | SE | 10th Nov 2009 |
| 193.104.126.0/24 | 256 | RIPE NCC | US | 17th Aug 2026 |
| 193.104.127.0/24 | 256 | RIPE NCC |  RU | 11th Nov 2009 |
| 193.104.137.0/24 | 256 | RIPE NCC |  IT | 12th Nov 2009 |
| 193.104.140.0/24 | 256 | RIPE NCC |  GG | 18th Nov 2009 |
| 193.104.141.0/24 | 256 | RIPE NCC | SE | 15th Nov 2019 |
| 193.104.142.0/24 | 256 | RIPE NCC |  NL | 15th Nov 2019 |
| 193.104.144.0/24 | 256 | RIPE NCC |  GB | 19th Nov 2009 |
| 193.104.147.0/24 | 256 | RIPE NCC |  IL | 19th Nov 2009 |
| 193.104.153.0/24 | 256 | RIPE NCC | NL | 15th Nov 2019 |
| 193.104.176.0/24 | 256 | RIPE NCC | NL | 15th Nov 2019 |
| 193.104.181.0/24 | 256 | RIPE NCC | GB | 30th Dec 2024 |
| 193.104.185.0/24 | 256 | RIPE NCC | CH | 7th Dec 2009 |
| 193.104.186.0/24 | 256 | RIPE NCC | NL | 7th Dec 2009 |
| 193.104.19.0/24 | 256 | RIPE NCC |  FR | 2nd Oct 2009 |
| 193.104.190.0/24 | 256 | RIPE NCC | NL | 15th Nov 2019 |
| 193.104.204.0/24 | 256 | RIPE NCC |  SA | 14th Dec 2009 |
| 193.104.21.0/24 | 256 | RIPE NCC | RO | 5th Oct 2009 |
| 193.104.215.0/24 | 256 | RIPE NCC |  IE | 16th Dec 2009 |
| 193.104.221.0/24 | 256 | RIPE NCC |  PL | 18th Dec 2009 |
| 193.104.228.0/24 | 256 | RIPE NCC |  DK | 17th Nov 2009 |
| 193.104.23.0/24 | 256 | RIPE NCC |  SI | 5th Oct 2009 |
| 193.104.255.0/24 | 256 | RIPE NCC | NL | 4th Jan 2010 |
| 193.104.44.0/24 | 256 | RIPE NCC |  ES | 13th Oct 2009 |
| 193.104.6.0/24 | 256 | RIPE NCC | NL | 30th Sept 2009 |