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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 130.78.120.0/21 | 2k | RIPE NCC |  NL | 24th Jun 1988 |
| 130.78.128.0/19 | 8.2k | RIPE NCC | NL | 24th Jun 1988 |
| 130.78.16.0/20 | 4.1k | RIPE NCC | NL | 24th Jun 1988 |
| 130.78.160.0/20 | 4.1k | RIPE NCC | NL | 24th Jun 1988 |
| 130.78.176.0/24 | 256 | RIPE NCC |  US | 24th Jun 1988 |
| 130.78.177.0/24 | 256 | RIPE NCC |  PL | 24th Jun 1988 |
| 130.78.178.0/23 | 512 | RIPE NCC | US | 24th Jun 1988 |
| 130.78.180.0/22 | 1k | RIPE NCC | US | 24th Jun 1988 |
| 130.78.192.0/20 | 4.1k | RIPE NCC | NL | 24th Jun 1988 |
| 130.78.208.0/21 | 2k | RIPE NCC | NL | 24th Jun 1988 |
| 130.78.222.0/23 | 512 | RIPE NCC | NL | 24th Jun 1988 |
| 130.78.224.0/20 | 4.1k | RIPE NCC | NL | 24th Jun 1988 |
| 130.78.241.0/24 | 256 | RIPE NCC | NL | 24th Jun 1988 |
| 130.78.242.0/23 | 512 | RIPE NCC | NL | 24th Jun 1988 |
| 130.78.248.0/21 | 2k | RIPE NCC | NL | 24th Jun 1988 |
| 130.78.64.0/19 | 8.2k | RIPE NCC | NL | 24th Jun 1988 |
| 130.78.96.0/20 | 4.1k | RIPE NCC |  CH | 24th Jun 1988 |
| 130.8.0.0/15 | 131k | ARIN | US | 25th Sept 1992 |
| 130.97.0.0/16 | 65.5k | ARIN | US | 13th Jul 1988 |
| 130.98.0.0/16 | 65.5k | RIPE NCC |  FR | 1st Apr 2005 |
| 130.99.0.0/16 | 65.5k | ARIN | US | 14th Jul 1988 |
| 131.0.152.0/22 | 1k | LACNIC |  BR | 14th Jul 2014 |
| 131.0.36.0/22 | 1k | LACNIC | BR | 10th Jul 2014 |
| 131.100.112.0/22 | 1k | LACNIC | BR | 26th Aug 2014 |
| 131.100.32.0/22 | 1k | LACNIC | BR | 8th Aug 2014 |
| 131.101.0.0/16 | 65.5k | ARIN | US | 3rd Nov 1988 |
| 131.108.96.0/22 | 1k | LACNIC | BR | 1st Sept 2014 |
| 131.110.0.0/16 | 65.5k | ARIN | US | 11th Nov 1988 |
| 131.117.0.0/17 | 32.8k | RIPE NCC | CH | 31st May 1995 |
| 131.117.168.0/21 | 2k | RIPE NCC |  GB | 8th Mar 2012 |
| 131.117.216.0/21 | 2k | RIPE NCC |  RU | 16th Mar 2012 |
| 131.124.0.0/16 | 65.5k | ARIN | US | 17th Nov 1988 |
| 131.125.64.0/18 | 16.4k | ARIN | US | 3rd May 2024 |
| 131.131.0.0/16 | 65.5k | ARIN | US | 22nd Sept 1988 |
| 131.133.0.0/16 | 65.5k | ARIN |  CA | 19th Jul 1989 |
| 131.140.0.0/15 | 131k | ARIN | CA | 21st Nov 1988 |
| 131.143.0.0/22 | 1k | ARIN | US | 8th Oct 2025 |
| 131.143.110.0/24 | 256 | ARIN | US | 10th Oct 2025 |
| 131.143.116.0/22 | 1k | ARIN | US | 7th Oct 2025 |
| 131.143.127.0/24 | 256 | ARIN | US | 13th Jan 2026 |
| 131.143.172.0/24 | 256 | ARIN | US | 27th Oct 2025 |
| 131.143.184.0/22 | 1k | ARIN | US | 7th Oct 2025 |
| 131.143.220.0/23 | 512 | ARIN |  AQ | 6th Oct 2025 |
| 131.143.222.0/24 | 256 | ARIN | US | 5th Nov 2025 |
| 131.143.223.0/24 | 256 | ARIN | US | 7th Oct 2025 |
| 131.143.228.0/22 | 1k | ARIN | US | 6th Oct 2025 |
| 131.143.236.0/23 | 512 | ARIN | US | 6th Oct 2025 |
| 131.143.238.0/24 | 256 | ARIN | US | 6th Oct 2025 |
| 131.143.24.0/22 | 1k | ARIN | US | 7th Oct 2025 |
| 131.143.254.0/24 | 256 | ARIN | US | 6th Oct 2025 |