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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,108 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 189.105.16.0/20 | 4.1k | ARIN |  US | 13th Mar 2025 |
| 189.105.32.0/19 | 8.2k | RIPE NCC |  LT | 6th Mar 2025 |
| 189.105.64.0/18 | 16.4k | RIPE NCC |  HK | 20th Feb 2025 |
| 189.106.0.0/15 | 131k | ARIN | US | 29th Jul 2026 |
| 189.11.176.0/20 | 4.1k | RIPE NCC | LT | 13th Mar 2025 |
| 189.12.0.0/19 | 8.2k | ARIN | US | 13th Mar 2025 |
| 189.12.128.0/18 | 16.4k | RIPE NCC |  AE | 6th Mar 2025 |
| 189.12.208.0/20 | 4.1k | LACNIC |  BR | 24th Oct 2006 |
| 189.12.80.0/20 | 4.1k | RIPE NCC | LT | 13th Mar 2025 |
| 189.12.96.0/19 | 8.2k | RIPE NCC | LT | 13th Mar 2025 |
| 189.201.246.0/24 | 256 | LACNIC |  MX | 6th Aug 2007 |
| 189.201.247.0/24 | 256 | LACNIC | MX | 6th Aug 2007 |
| 189.24.0.0/19 | 8.2k | RIPE NCC | LT | 6th Mar 2025 |
| 189.24.128.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |
| 189.24.32.0/20 | 4.1k | RIPE NCC | LT | 13th Mar 2025 |
| 189.30.160.0/20 | 4.1k | RIPE NCC | LT | 13th Mar 2025 |
| 189.30.64.0/18 | 16.4k | RIPE NCC | AE | 6th Mar 2025 |
| 189.31.0.0/19 | 8.2k | RIPE NCC | AE | 13th Mar 2025 |
| 189.31.208.0/20 | 4.1k | RIPE NCC | US | 13th Mar 2025 |
| 189.31.224.0/19 | 8.2k | ARIN | US | 13th Mar 2025 |
| 189.31.32.0/20 | 4.1k | RIPE NCC | LT | 13th Mar 2025 |
| 189.31.80.0/20 | 4.1k | RIPE NCC | LT | 13th Mar 2025 |
| 189.31.96.0/20 | 4.1k | RIPE NCC | LT | 13th Mar 2025 |
| 189.48.0.0/16 | 65.5k | ARIN | US | 29th Jul 2026 |
| 189.49.128.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |
| 189.49.80.0/20 | 4.1k | RIPE NCC | LT | 13th Mar 2025 |
| 189.49.96.0/19 | 8.2k | RIPE NCC | LT | 6th Mar 2025 |
| 189.51.172.0/22 | 1k | LACNIC | MX | 17th Jun 2020 |
| 189.70.0.0/15 | 131k | ARIN | US | 29th Jul 2026 |
| 189.72.144.0/20 | 4.1k | RIPE NCC | LT | 13th Mar 2025 |
| 189.72.176.0/20 | 4.1k | RIPE NCC | LT | 13th Mar 2025 |
| 189.72.96.0/19 | 8.2k | ARIN | US | 13th Mar 2025 |
| 189.73.128.0/20 | 4.1k | RIPE NCC | LT | 13th Mar 2025 |
| 189.73.224.0/20 | 4.1k | RIPE NCC | LT | 13th Mar 2025 |
| 189.73.32.0/20 | 4.1k | RIPE NCC | AE | 13th Mar 2025 |
| 189.73.96.0/20 | 4.1k | RIPE NCC | LT | 13th Mar 2025 |
| 189.75.0.0/20 | 4.1k | APNIC | HK | 13th Mar 2025 |
| 189.75.144.0/20 | 4.1k | APNIC | HK | 13th Mar 2025 |
| 189.75.32.0/20 | 4.1k | RIPE NCC | LT | 13th Mar 2025 |
| 189.82.0.0/15 | 131k | ARIN | US | 29th Jul 2026 |
| 189.89.254.0/24 | 256 | LACNIC | BR | 4th Mar 2008 |
| 190.103.32.0/20 | 4.1k | LACNIC | MX | 7th Jul 2026 |
| 190.103.48.0/20 | 4.1k | LACNIC |  VE | 31st Mar 2009 |
| 190.109.88.0/22 | 1k | LACNIC | BR | 30th Apr 2015 |
| 190.110.0.0/19 | 8.2k | LACNIC | MX | 10th Sept 2008 |
| 190.110.240.0/24 | 256 | LACNIC |  AR | 28th Nov 2011 |
| 190.110.242.0/23 | 512 | LACNIC | AR | 28th Nov 2011 |
| 190.110.244.0/24 | 256 | LACNIC | AR | 28th Nov 2011 |
| 190.111.102.0/23 | 512 | LACNIC | BR | 27th Feb 2020 |
| 190.112.128.0/22 | 1k | LACNIC | BR | 13th Jan 2020 |