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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through RIPE NCC, largest first.
Unannounced blocks registered through RIPE NCC
24,902 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 168.222.224.0/21 | 2k | RIPE NCC |  RU | 12th Aug 1994 |
| 168.222.236.0/22 | 1k | RIPE NCC |  PL | 12th Aug 1994 |
| 169.36.0.0/15 | 131k | RIPE NCC |  CH | 1st Sept 1993 |
| 169.39.0.0/16 | 65.5k | RIPE NCC | CH | 1st Sept 1993 |
| 169.41.0.0/16 | 65.5k | RIPE NCC | CH | 1st Sept 1993 |
| 169.42.0.0/15 | 131k | RIPE NCC | CH | 1st Sept 1993 |
| 169.49.0.0/16 | 65.5k | RIPE NCC | CH | 1st Sept 1993 |
| 169.52.0.0/16 | 65.5k | RIPE NCC | CH | 1st Sept 1993 |
| 170.100.147.0/24 | 256 | RIPE NCC |  US | 24th Mar 1994 |
| 170.236.0.0/16 | 65.5k | RIPE NCC | CH | 26th Mar 1997 |
| 170.237.128.0/17 | 32.8k | RIPE NCC | CH | 26th Mar 1997 |
| 170.237.16.0/20 | 4.1k | RIPE NCC | CH | 26th Mar 1997 |
| 170.237.32.0/19 | 8.2k | RIPE NCC | CH | 26th Mar 1997 |
| 170.237.64.0/18 | 16.4k | RIPE NCC | CH | 26th Mar 1997 |
| 170.246.64.0/22 | 1k | RIPE NCC |  NL | 10th Feb 2017 |
| 170.37.203.0/24 | 256 | RIPE NCC |  FR | 3rd Feb 1994 |
| 170.37.204.0/23 | 512 | RIPE NCC | FR | 3rd Feb 1994 |
| 170.37.206.0/24 | 256 | RIPE NCC | FR | 3rd Feb 1994 |
| 170.60.0.0/16 | 65.5k | RIPE NCC | CH | 22nd Feb 1994 |
| 170.62.190.0/24 | 256 | RIPE NCC |  LT | 22nd Feb 1994 |
| 171.22.120.0/22 | 1k | RIPE NCC |  CY | 31st Jan 2019 |
| 171.22.124.0/22 | 1k | RIPE NCC | CY | 31st Jan 2019 |
| 171.22.200.0/22 | 1k | RIPE NCC | US | 1st Feb 2019 |
| 171.22.236.0/22 | 1k | RIPE NCC | RU | 1st Feb 2019 |
| 171.22.243.0/24 | 256 | RIPE NCC |  VG | 10th Jan 2024 |
| 171.22.36.0/22 | 1k | RIPE NCC |  RO | 30th Jan 2019 |
| 171.25.0.0/17 | 32.8k | RIPE NCC | CH | 9th Aug 1994 |
| 171.25.176.0/24 | 256 | RIPE NCC |  CZ | 12th Jan 2012 |
| 171.25.178.0/24 | 256 | RIPE NCC |  DE | 11th Apr 2012 |
| 171.25.179.0/24 | 256 | RIPE NCC | NL | 12th Jan 2012 |
| 171.25.184.0/22 | 1k | RIPE NCC | RU | 13th Jan 2012 |
| 171.25.191.0/24 | 256 | RIPE NCC |  IT | 13th Jan 2012 |
| 171.25.236.0/22 | 1k | RIPE NCC |  UA | 19th Jan 2012 |
| 171.25.244.0/22 | 1k | RIPE NCC | RU | 20th Jan 2012 |
| 171.25.252.0/22 | 1k | RIPE NCC | RU | 20th Jan 2012 |
| 171.28.0.0/15 | 131k | RIPE NCC |  GB | 9th Jan 1995 |
| 171.30.0.0/16 | 65.5k | RIPE NCC | GB | 9th Jan 1995 |
| 171.33.0.0/18 | 16.4k | RIPE NCC | CH | 10th Feb 1995 |
| 171.33.224.0/21 | 2k | RIPE NCC | NL | 3rd Jul 2012 |
| 172.111.32.0/24 | 256 | RIPE NCC | GB | 7th Jul 2021 |
| 173.255.148.0/24 | 256 | RIPE NCC |  LU | 1st Feb 2010 |
| 173.255.149.0/24 | 256 | RIPE NCC |  JE | 1st Feb 2010 |
| 173.255.150.0/24 | 256 | RIPE NCC | LU | 1st Feb 2010 |
| 173.255.151.0/24 | 256 | RIPE NCC | JE | 1st Feb 2010 |
| 176.10.89.0/24 | 256 | RIPE NCC | US | 23rd Jan 2025 |
| 176.10.90.0/24 | 256 | RIPE NCC |  CA | 23rd Jan 2025 |
| 176.10.94.0/24 | 256 | RIPE NCC | GB | 29th Jan 2025 |
| 176.100.200.0/21 | 2k | RIPE NCC |  ES | 31st Oct 2011 |
| 176.100.248.0/23 | 512 | RIPE NCC | RU | 30th Jan 2012 |
| 176.100.250.0/24 | 256 | RIPE NCC | RU | 30th Jan 2012 |