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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,968 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 145.71.0.0/16 | 65.5k | RIPE NCC |  NL | 1st Sept 1993 |
| 145.73.0.0/16 | 65.5k | RIPE NCC | NL | 1st Sept 1993 |
| 145.80.0.0/16 | 65.5k | RIPE NCC | NL | 1st Sept 1993 |
| 145.87.128.0/18 | 16.4k | RIPE NCC | NL | 1st Sept 1993 |
| 145.87.192.0/19 | 8.2k | RIPE NCC | NL | 1st Sept 1993 |
| 146.0.57.0/24 | 256 | RIPE NCC |  GB | 7th Jul 2011 |
| 146.0.58.0/23 | 512 | RIPE NCC |  LU | 7th Jul 2011 |
| 146.0.64.0/21 | 2k | RIPE NCC |  FR | 7th Jul 2011 |
| 146.10.0.0/16 | 65.5k | ARIN |  US | 17th Jan 1991 |
| 146.100.0.0/16 | 65.5k | RIPE NCC |  IT | 5th Feb 1991 |
| 146.106.0.0/16 | 65.5k | RIPE NCC | NL | 5th Feb 1991 |
| 146.117.0.0/16 | 65.5k | APNIC |  JP | 11th Feb 2011 |
| 146.123.0.0/16 | 65.5k | ARIN | US | 9th Nov 2023 |
| 146.125.0.0/16 | 65.5k | ARIN | US | 7th Feb 1991 |
| 146.128.0.0/16 | 65.5k | ARIN | US | 8th Feb 1991 |
| 146.13.0.0/16 | 65.5k | ARIN | US | 17th Jan 1991 |
| 146.135.128.0/17 | 32.8k | ARIN | US | 8th Feb 1991 |
| 146.147.0.0/16 | 65.5k | ARIN | US | 24th Nov 2015 |
| 146.149.0.0/16 | 65.5k | ARIN | US | 15th Feb 1991 |
| 146.150.0.0/16 | 65.5k | ARIN | US | 15th Feb 1991 |
| 146.156.0.0/16 | 65.5k | ARIN | US | 15th Feb 1991 |
| 146.161.0.0/16 | 65.5k | RIPE NCC |  FI | 15th Feb 1991 |
| 146.170.0.0/16 | 65.5k | ARIN | US | 22nd Feb 1991 |
| 146.173.0.0/16 | 65.5k | RIPE NCC |  SE | 22nd Feb 1991 |
| 146.180.0.0/16 | 65.5k | ARIN | US | 26th Feb 1991 |
| 146.185.220.0/23 | 512 | RIPE NCC | LU | 13th Jul 2011 |
| 146.19.157.0/24 | 256 | RIPE NCC |  DE | 16th Nov 2021 |
| 146.19.166.0/24 | 256 | RIPE NCC | DE | 16th Nov 2021 |
| 146.19.170.0/24 | 256 | RIPE NCC |  MD | 16th Nov 2021 |
| 146.19.174.0/24 | 256 | RIPE NCC |  HK | 17th Nov 2021 |
| 146.19.181.0/24 | 256 | RIPE NCC | US | 17th Nov 2021 |
| 146.19.192.0/24 | 256 | RIPE NCC | NL | 17th Nov 2021 |
| 146.19.194.0/24 | 256 | RIPE NCC |  EE | 17th Nov 2021 |
| 146.19.202.0/24 | 256 | RIPE NCC |  CY | 17th Nov 2021 |
| 146.19.204.0/24 | 256 | RIPE NCC |  UA | 17th Nov 2021 |
| 146.19.231.0/24 | 256 | RIPE NCC | NL | 18th Nov 2021 |
| 146.19.233.0/24 | 256 | RIPE NCC |  RU | 19th Nov 2021 |
| 146.19.240.0/24 | 256 | RIPE NCC |  IL | 19th Nov 2021 |
| 146.19.243.0/24 | 256 | RIPE NCC |  AT | 19th Nov 2021 |
| 146.19.244.0/24 | 256 | RIPE NCC | RU | 19th Nov 2021 |
| 146.19.246.0/24 | 256 | RIPE NCC |  JO | 19th Nov 2021 |
| 146.19.247.0/24 | 256 | RIPE NCC |  LV | 19th Nov 2021 |
| 146.19.252.0/24 | 256 | RIPE NCC | US | 22nd Nov 2021 |
| 146.19.33.0/24 | 256 | RIPE NCC |  PL | 11th Nov 2021 |
| 146.19.34.0/24 | 256 | RIPE NCC |  SI | 11th Nov 2021 |
| 146.19.35.0/24 | 256 | RIPE NCC | SI | 11th Nov 2021 |
| 146.19.38.0/24 | 256 | RIPE NCC |  LT | 11th Nov 2021 |
| 146.19.57.0/24 | 256 | RIPE NCC |  TR | 11th Nov 2021 |
| 146.19.6.0/24 | 256 | RIPE NCC | DE | 10th Nov 2021 |
| 146.19.70.0/24 | 256 | RIPE NCC | TR | 7th Jan 2025 |