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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,239 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 193.43.72.0/24 | 256 | RIPE NCC |  RU | 14th Nov 2019 |
| 193.43.73.0/24 | 256 | RIPE NCC |  IT | 1st Jan 1995 |
| 193.43.76.0/24 | 256 | RIPE NCC | IT | 12th Jan 1995 |
| 193.43.88.0/24 | 256 | RIPE NCC |  BE | 15th Dec 2004 |
| 193.43.89.0/24 | 256 | RIPE NCC |  NL | 15th Dec 2004 |
| 193.46.1.0/24 | 256 | RIPE NCC |  AT | 11th Dec 1997 |
| 193.46.12.0/22 | 1k | RIPE NCC | AT | 21st Sept 1993 |
| 193.46.136.0/21 | 2k | RIPE NCC | AT | 30th Mar 1999 |
| 193.46.144.0/20 | 4.1k | RIPE NCC | AT | 30th Mar 1999 |
| 193.46.16.0/22 | 1k | RIPE NCC | AT | 21st Sept 1993 |
| 193.46.160.0/21 | 2k | RIPE NCC | AT | 30th Mar 1999 |
| 193.46.168.0/22 | 1k | RIPE NCC | AT | 30th Mar 1999 |
| 193.46.183.0/24 | 256 | RIPE NCC |  IE | 13th Aug 2007 |
| 193.46.185.0/24 | 256 | RIPE NCC |  UA | 13th Feb 2023 |
| 193.46.191.0/24 | 256 | RIPE NCC | AT | 24th Feb 1994 |
| 193.46.207.0/24 | 256 | RIPE NCC | RU | 20th Aug 2007 |
| 193.46.215.0/24 | 256 | RIPE NCC |  DE | 23rd Aug 2007 |
| 193.46.222.0/23 | 512 | RIPE NCC | AT | 9th Oct 2019 |
| 193.46.249.0/24 | 256 | RIPE NCC |  GB | 22nd Apr 1994 |
| 193.46.253.0/24 | 256 | RIPE NCC | AT | 14th Apr 1994 |
| 193.46.36.0/22 | 1k | RIPE NCC | DE | 16th Jul 2018 |
| 193.46.44.0/24 | 256 | RIPE NCC | AT | 12th Dec 1997 |
| 193.46.63.0/24 | 256 | RIPE NCC | DE | 25th Jul 2007 |
| 193.46.71.0/24 | 256 | RIPE NCC |  SI | 27th Jul 2007 |
| 193.46.76.0/24 | 256 | RIPE NCC | GB | 1st Aug 2007 |
| 193.46.78.0/23 | 512 | RIPE NCC | AT | 9th Oct 2019 |
| 193.46.80.0/24 | 256 | RIPE NCC | NL | 2nd Aug 2007 |
| 193.46.89.0/24 | 256 | RIPE NCC | UA | 7th Aug 2007 |
| 193.46.90.0/24 | 256 | RIPE NCC |  US | 27th Nov 2023 |
| 193.46.91.0/24 | 256 | RIPE NCC |  RO | 9th Aug 2007 |
| 193.46.92.0/22 | 1k | RIPE NCC | NL | 10th Aug 1994 |
| 193.46.96.0/22 | 1k | RIPE NCC | NL | 10th Aug 1994 |
| 193.47.142.0/24 | 256 | RIPE NCC |  DK | 6th Aug 2010 |
| 193.47.144.0/24 | 256 | RIPE NCC | RO | 20th Jul 2005 |
| 193.47.150.0/24 | 256 | RIPE NCC | NL | 14th Nov 2019 |
| 193.47.153.0/24 | 256 | RIPE NCC |  CH | 22nd Jul 2005 |
| 193.47.188.0/24 | 256 | RIPE NCC | NL | 1st Aug 2005 |
| 193.47.192.0/24 | 256 | RIPE NCC |  FR | 1st Sept 1993 |
| 193.47.193.0/24 | 256 | RIPE NCC | NL | 14th Nov 2019 |
| 193.47.194.0/23 | 512 | RIPE NCC | CH | 1st Sept 1993 |
| 193.47.196.0/22 | 1k | RIPE NCC | CH | 1st Sept 1993 |
| 193.47.200.0/21 | 2k | RIPE NCC | CH | 1st Sept 1993 |
| 193.47.208.0/20 | 4.1k | RIPE NCC | CH | 1st Sept 1993 |
| 193.47.224.0/23 | 512 | RIPE NCC | CH | 1st Sept 1993 |
| 193.47.226.0/23 | 512 | RIPE NCC | CH | 1st Sept 1993 |
| 193.47.228.0/22 | 1k | RIPE NCC | CH | 1st Sept 1993 |
| 193.47.232.0/23 | 512 | RIPE NCC | CH | 1st Sept 1993 |
| 193.47.234.0/23 | 512 | RIPE NCC |  EE | 9th Oct 2019 |
| 193.47.236.0/22 | 1k | RIPE NCC | RO | 30th Apr 2018 |
| 193.47.244.0/23 | 512 | RIPE NCC | EE | 9th Oct 2019 |