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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,221 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.92.172.0/24 | 256 | ARIN |  US | 5th Feb 1991 |
| 192.92.173.0/24 | 256 | ARIN | US | 5th Feb 1991 |
| 192.92.174.0/23 | 512 | ARIN | US | 5th Feb 1991 |
| 192.92.177.0/24 | 256 | ARIN | US | 5th Feb 1991 |
| 192.92.178.0/23 | 512 | ARIN | US | 5th Feb 1991 |
| 192.92.180.0/23 | 512 | ARIN | US | 5th Feb 1991 |
| 192.92.183.0/24 | 256 | ARIN | US | 5th Feb 1991 |
| 192.92.187.0/24 | 256 | ARIN | US | 5th Feb 1991 |
| 192.92.188.0/24 | 256 | ARIN | US | 5th Feb 1991 |
| 192.92.190.0/24 | 256 | ARIN | US | 5th Feb 1991 |
| 192.92.191.0/24 | 256 | ARIN | US | 5th Feb 1991 |
| 192.92.192.0/24 | 256 | ARIN | US | 5th Feb 1991 |
| 192.92.212.0/23 | 512 | ARIN | US | 8th Jan 2015 |
| 192.92.215.0/24 | 256 | ARIN | US | 5th Feb 1991 |
| 192.92.216.0/24 | 256 | RIPE NCC |  NO | 1st Sept 1993 |
| 192.92.217.0/24 | 256 | ARIN | US | 5th Feb 1991 |
| 192.92.218.0/24 | 256 | ARIN | US | 5th Feb 1991 |
| 192.92.219.0/24 | 256 | ARIN | US | 6th Feb 1991 |
| 192.92.220.0/22 | 1k | ARIN | US | 6th Feb 1991 |
| 192.92.224.0/21 | 2k | ARIN | US | 6th Feb 1991 |
| 192.92.232.0/23 | 512 | ARIN | US | 6th Feb 1991 |
| 192.92.234.0/24 | 256 | ARIN | US | 6th Feb 1991 |
| 192.92.64.0/20 | 4.1k | ARIN | US | 22nd Jan 1991 |
| 192.92.83.0/24 | 256 | ARIN | US | 22nd Jan 1991 |
| 192.92.84.0/24 | 256 | ARIN | US | 23rd Jan 1991 |
| 192.92.85.0/24 | 256 | ARIN | US | 25th Jun 2020 |
| 192.92.86.0/24 | 256 | RIPE NCC |  FR | 23rd Jan 1991 |
| 192.92.88.0/24 | 256 | ARIN | US | 23rd Jan 1991 |
| 192.92.89.0/24 | 256 | ARIN | US | 23rd Jan 1991 |
| 192.92.9.0/24 | 256 | ARIN | US | 21st Jan 1991 |
| 192.92.90.0/24 | 256 | ARIN | US | 23rd Jan 1991 |
| 192.92.91.0/24 | 256 | ARIN | US | 23rd Jan 1991 |
| 192.92.93.0/24 | 256 | ARIN | US | 23rd Jan 1991 |
| 192.92.95.0/24 | 256 | ARIN | US | 23rd Jan 1991 |
| 192.92.96.0/24 | 256 | ARIN | US | 23rd Jan 1991 |
| 192.92.98.0/24 | 256 | ARIN | US | 23rd Jan 1991 |
| 192.92.99.0/24 | 256 | ARIN |  CA | 5th Mar 2025 |
| 192.93.104.0/24 | 256 | RIPE NCC | FR | 1st Jan 1984 |
| 192.93.110.0/23 | 512 | RIPE NCC | FR | 1st Jan 1984 |
| 192.93.112.0/21 | 2k | RIPE NCC | FR | 1st Jan 1984 |
| 192.93.120.0/24 | 256 | RIPE NCC | FR | 1st Jan 1984 |
| 192.93.121.0/24 | 256 | RIPE NCC | FR | 11th Apr 2005 |
| 192.93.128.0/20 | 4.1k | RIPE NCC | FR | 1st Jan 1984 |
| 192.93.144.0/22 | 1k | RIPE NCC | FR | 1st Jan 1984 |
| 192.93.152.0/24 | 256 | RIPE NCC | FR | 11th Apr 2005 |
| 192.93.153.0/24 | 256 | RIPE NCC | FR | 1st Jan 1984 |
| 192.93.154.0/23 | 512 | RIPE NCC | FR | 1st Jan 1984 |
| 192.93.224.0/24 | 256 | RIPE NCC | FR | 1st Jan 1984 |
| 192.93.227.0/24 | 256 | RIPE NCC | FR | 1st Jan 1984 |
| 192.93.228.0/22 | 1k | RIPE NCC | FR | 1st Jan 1984 |