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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in United States
26,951 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 194.179.146.0/23 | 512 | ARIN |  US | 9th Dec 2024 |
| 194.26.194.0/24 | 256 | ARIN | US | 13th Feb 2024 |
| 194.32.244.0/22 | 1k | RIPE NCC | US | 29th Oct 2018 |
| 194.33.149.0/24 | 256 | ARIN | US | 18th Jan 2022 |
| 194.33.182.0/24 | 256 | ARIN | US | 18th Jan 2022 |
| 194.34.105.0/24 | 256 | RIPE NCC | US | 19th Sept 2018 |
| 194.34.175.0/24 | 256 | ARIN | US | 18th Jan 2022 |
| 194.39.245.0/24 | 256 | RIPE NCC | US | 4th Jul 2024 |
| 194.41.63.0/24 | 256 | RIPE NCC | US | 3rd Jan 1995 |
| 194.45.47.0/24 | 256 | RIPE NCC | US | 28th Feb 1994 |
| 194.5.86.0/24 | 256 | RIPE NCC | US | 20th Nov 2019 |
| 194.53.48.0/22 | 1k | RIPE NCC | US | 30th Jul 2018 |
| 194.62.176.0/22 | 1k | RIPE NCC | US | 29th Nov 1994 |
| 194.77.148.0/24 | 256 | RIPE NCC | US | 16th Oct 1995 |
| 194.77.64.0/24 | 256 | RIPE NCC | US | 16th Oct 1995 |
| 194.8.49.0/24 | 256 | RIPE NCC | US | 14th Oct 2003 |
| 194.9.240.0/24 | 256 | RIPE NCC | US | 2nd Nov 1999 |
| 194.9.241.0/24 | 256 | RIPE NCC | US | 2nd Nov 1999 |
| 194.9.243.0/24 | 256 | RIPE NCC | US | 2nd Nov 1999 |
| 194.9.246.0/23 | 512 | RIPE NCC | US | 2nd Nov 1999 |
| 194.9.248.0/24 | 256 | RIPE NCC | US | 2nd Nov 1999 |
| 194.9.249.0/24 | 256 | RIPE NCC | US | 2nd Nov 1999 |
| 194.9.250.0/23 | 512 | RIPE NCC | US | 2nd Nov 1999 |
| 194.9.252.0/22 | 1k | RIPE NCC | US | 2nd Nov 1999 |
| 194.93.192.0/18 | 16.4k | RIPE NCC | US | 20th Oct 1994 |
| 195.13.44.0/23 | 512 | RIPE NCC | US | 1st Nov 2019 |
| 195.135.194.0/24 | 256 | RIPE NCC | US | 14th Jan 2009 |
| 195.138.197.0/24 | 256 | RIPE NCC | US | 18th Jul 2023 |
| 195.180.176.0/20 | 4.1k | ARIN | US | 3rd Jun 2024 |
| 195.2.252.0/23 | 512 | ARIN | US | 24th Feb 2022 |
| 195.206.144.0/20 | 4.1k | ARIN | US | 3rd Jun 2024 |
| 195.214.213.0/24 | 256 | RIPE NCC | US | 28th Oct 2003 |
| 195.214.214.0/24 | 256 | RIPE NCC | US | 28th Oct 2003 |
| 195.230.118.0/24 | 256 | RIPE NCC | US | 3rd Apr 2008 |
| 195.234.162.0/24 | 256 | RIPE NCC | US | 19th Sept 2002 |
| 195.245.247.0/24 | 256 | RIPE NCC | US | 24th Jan 2003 |
| 195.246.193.0/24 | 256 | RIPE NCC | US | 25th Feb 2025 |
| 195.248.66.0/24 | 256 | RIPE NCC | US | 23rd Jun 2006 |
| 195.60.92.64/26 | 64 | RIPE NCC | US | 10th Mar 2026 |
| 195.62.89.0/24 | 256 | RIPE NCC | US | 16th Nov 2022 |
| 195.85.36.0/24 | 256 | ARIN | US | 7th Jul 2023 |
| 195.93.0.0/17 | 32.8k | RIPE NCC | US | 27th Feb 1997 |
| 196.1.140.0/24 | 256 | ARIN | US | 13th Dec 1994 |
| 196.1.142.0/24 | 256 | ARIN | US | 31st Mar 1995 |
| 196.216.1.0/24 | 256 | ARIN | US | 8th Feb 1993 |
| 196.4.46.0/23 | 512 | ARIN | US | 28th Jan 1994 |
| 196.4.64.0/22 | 1k | ARIN | US | 28th Jan 1994 |
| 198.1.16.0/21 | 2k | ARIN | US | 4th Jan 1993 |
| 198.1.24.0/23 | 512 | ARIN | US | 4th Jan 1993 |
| 198.1.8.0/21 | 2k | ARIN | US | 20th Nov 1992 |