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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,960 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 46.248.32.0/19 | 8.2k | RIPE NCC |  IR | 17th Dec 2010 |
| 46.249.112.0/21 | 2k | RIPE NCC |  AU | 30th Dec 2010 |
| 46.250.132.0/22 | 1k | RIPE NCC |  RU | 28th Jan 2011 |
| 46.250.136.0/22 | 1k | RIPE NCC | RU | 28th Jan 2011 |
| 46.250.144.0/22 | 1k | RIPE NCC | RU | 28th Jan 2011 |
| 46.250.148.0/22 | 1k | RIPE NCC | RU | 28th Jan 2011 |
| 46.250.152.0/22 | 1k | RIPE NCC | RU | 28th Jan 2011 |
| 46.251.224.0/24 | 256 | RIPE NCC | IR | 9th Feb 2011 |
| 46.251.226.0/24 | 256 | RIPE NCC | IR | 9th Feb 2011 |
| 46.251.237.0/24 | 256 | RIPE NCC | IR | 9th Feb 2011 |
| 46.251.239.0/24 | 256 | RIPE NCC |  AT | 9th Feb 2011 |
| 46.251.64.0/19 | 8.2k | RIPE NCC | RU | 3rd Feb 2011 |
| 46.253.137.0/24 | 256 | RIPE NCC |  NL | 22nd Sept 2021 |
| 46.253.144.0/20 | 4.1k | RIPE NCC |  DE | 14th Jan 2011 |
| 46.254.168.0/21 | 2k | RIPE NCC | NL | 21st Dec 2010 |
| 46.255.0.0/21 | 2k | RIPE NCC |  GB | 23rd Dec 2010 |
| 46.255.28.0/24 | 256 | RIPE NCC |  EE | 5th Jul 2024 |
| 46.255.56.0/21 | 2k | RIPE NCC |  OM | 23rd Dec 2010 |
| 46.28.200.0/21 | 2k | RIPE NCC |  CH | 5th Aug 2011 |
| 46.28.239.0/24 | 256 | RIPE NCC |  TR | 27th Jul 2010 |
| 46.29.104.0/21 | 2k | RIPE NCC |  IT | 10th Aug 2010 |
| 46.29.128.0/21 | 2k | RIPE NCC |  UA | 11th Aug 2010 |
| 46.29.33.0/24 | 256 | RIPE NCC | IR | 15th Jan 2025 |
| 46.29.35.0/24 | 256 | RIPE NCC | EE | 16th Jan 2025 |
| 46.29.37.0/24 | 256 | RIPE NCC | RU | 16th Jan 2025 |
| 46.29.39.0/24 | 256 | RIPE NCC |  AE | 16th Jan 2025 |
| 46.29.56.0/21 | 2k | RIPE NCC | DE | 6th Aug 2010 |
| 46.29.88.0/21 | 2k | RIPE NCC | GB | 9th Aug 2010 |
| 46.30.184.0/22 | 1k | RIPE NCC |  FR | 14th Jun 2018 |
| 46.30.192.0/21 | 2k | RIPE NCC | DE | 7th Sept 2010 |
| 46.30.217.0/24 | 256 | RIPE NCC | IT | 8th Sept 2010 |
| 46.30.218.0/24 | 256 | RIPE NCC | IT | 8th Sept 2010 |
| 46.30.222.0/23 | 512 | RIPE NCC | IT | 8th Sept 2010 |
| 46.33.21.0/24 | 256 | RIPE NCC | GB | 20th Aug 2010 |
| 46.36.112.0/24 | 256 | RIPE NCC |  AM | 26th Oct 2010 |
| 46.36.113.0/24 | 256 | RIPE NCC | AM | 26th Oct 2010 |
| 46.36.114.0/23 | 512 | RIPE NCC | AM | 26th Oct 2010 |
| 46.36.116.0/23 | 512 | RIPE NCC | AM | 26th Oct 2010 |
| 46.36.118.0/23 | 512 | RIPE NCC | AM | 26th Oct 2010 |
| 46.36.192.0/21 | 2k | RIPE NCC | GB | 2nd Nov 2010 |
| 46.36.200.0/24 | 256 | RIPE NCC |  LT | 10th Jan 2024 |
| 46.36.202.0/24 | 256 | RIPE NCC | CH | 10th Jan 2024 |
| 46.36.203.0/24 | 256 | RIPE NCC | DE | 10th Jan 2024 |
| 46.36.224.0/19 | 8.2k | RIPE NCC |  PL | 3rd Nov 2010 |
| 46.43.128.0/18 | 16.4k | RIPE NCC | GB | 17th Aug 2010 |
| 46.58.0.0/17 | 32.8k | RIPE NCC |  FI | 14th Oct 2010 |
| 48.0.0.0/11 | 2.1M | ARIN |  US | 7th Dec 1990 |
| 48.128.0.0/11 | 2.1M | ARIN | US | 17th Jun 2026 |
| 48.32.0.0/13 | 524k | ARIN | US | 7th Dec 1990 |
| 48.40.0.0/14 | 262k | ARIN | US | 7th Dec 1990 |