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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 193.178.143.0/24 | 256 | RIPE NCC |  SA | 6th Oct 2025 |
| 193.178.148.0/23 | 512 | RIPE NCC |  AT | 14th Feb 2001 |
| 193.178.160.0/24 | 256 | RIPE NCC | AT | 15th Feb 2001 |
| 193.178.162.0/24 | 256 | RIPE NCC |  UA | 23rd Mar 2005 |
| 193.178.185.0/24 | 256 | RIPE NCC |  DE | 16th Jul 2002 |
| 193.178.189.0/24 | 256 | RIPE NCC |  NL | 29th Jul 2002 |
| 193.178.192.0/22 | 1k | RIPE NCC |  LV | 16th Feb 2001 |
| 193.178.204.0/22 | 1k | RIPE NCC |  IT | 7th Mar 2001 |
| 193.178.209.0/24 | 256 | RIPE NCC |  BE | 8th Mar 2001 |
| 193.178.210.0/24 | 256 | RIPE NCC |  RU | 14th Dec 2021 |
| 193.178.212.0/24 | 256 | RIPE NCC |  ES | 18th Nov 2019 |
| 193.178.214.0/24 | 256 | RIPE NCC |  PL | 12th Mar 2001 |
| 193.178.218.0/24 | 256 | RIPE NCC | ES | 18th Nov 2019 |
| 193.178.238.0/23 | 512 | RIPE NCC |  GB | 19th Mar 2001 |
| 193.178.24.0/22 | 1k | RIPE NCC |  IE | 30th Nov 1992 |
| 193.178.252.0/22 | 1k | RIPE NCC | IT | 26th Mar 2001 |
| 193.178.31.0/24 | 256 | RIPE NCC | ES | 18th Nov 2019 |
| 193.178.40.0/24 | 256 | RIPE NCC | IE | 6th Oct 1993 |
| 193.178.41.0/24 | 256 | RIPE NCC | IE | 7th Oct 1993 |
| 193.178.52.0/24 | 256 | RIPE NCC | ES | 18th Nov 2019 |
| 193.178.53.0/24 | 256 | RIPE NCC | IE | 24th Oct 1994 |
| 193.186.1.0/24 | 256 | RIPE NCC | ES | 18th Nov 2019 |
| 193.186.112.0/20 | 4.1k | RIPE NCC | AT | 18th Dec 2001 |
| 193.186.128.0/19 | 8.2k | RIPE NCC | AT | 18th Dec 2001 |
| 193.186.14.0/24 | 256 | RIPE NCC | RU | 12th Nov 2025 |
| 193.186.192.0/22 | 1k | RIPE NCC |  FR | 17th Sept 2018 |
| 193.186.209.0/24 | 256 | RIPE NCC | AT | 11th Feb 1997 |
| 193.186.211.0/24 | 256 | RIPE NCC |  DK | 12th Nov 2025 |
| 193.186.214.0/24 | 256 | RIPE NCC | AT | 12th May 1993 |
| 193.186.248.0/22 | 1k | RIPE NCC | AT | 16th Jun 1993 |
| 193.186.254.0/24 | 256 | RIPE NCC | DE | 9th Aug 1993 |
| 193.186.255.0/24 | 256 | RIPE NCC | PL | 13th Jul 2007 |
| 193.186.3.0/24 | 256 | RIPE NCC | DE | 16th Oct 2007 |
| 193.186.64.0/21 | 2k | RIPE NCC | AT | 11th Feb 1993 |
| 193.187.1.0/24 | 256 | ARIN |  US | 18th Jan 2022 |
| 193.187.124.0/22 | 1k | RIPE NCC | NL | 26th Oct 2018 |
| 193.187.152.0/22 | 1k | RIPE NCC | AT | 27th Nov 2018 |
| 193.187.160.0/22 | 1k | RIPE NCC | DK | 27th Nov 2018 |
| 193.187.244.0/24 | 256 | RIPE NCC | AT | 6th Sept 1993 |
| 193.187.245.0/24 | 256 | RIPE NCC | AT | 4th Oct 1993 |
| 193.187.246.0/24 | 256 | RIPE NCC | AT | 7th Oct 1993 |
| 193.187.247.0/24 | 256 | RIPE NCC | AT | 22nd Nov 1993 |
| 193.187.54.0/24 | 256 | RIPE NCC |  LB | 23rd Jul 2012 |
| 193.187.84.0/22 | 1k | RIPE NCC | DE | 9th May 2018 |
| 193.188.132.0/23 | 512 | RIPE NCC | GB | 16th Jun 1997 |
| 193.188.134.0/26 | 64 | RIPE NCC | NL | 15th May 1996 |
| 193.188.134.144/28 | 16 | RIPE NCC | FR | 13th Dec 2011 |
| 193.188.134.160/29 | 8 | RIPE NCC | PL | 21st Jun 2006 |
| 193.188.134.168/29 | 8 | RIPE NCC |  CY | 14th Sept 2012 |
| 193.188.134.176/28 | 16 | RIPE NCC | CY | 14th Sept 2012 |