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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,195 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.66.83.0/24 | 256 | RIPE NCC |  DK | 7th Nov 1989 |
| 192.66.84.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.85.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.86.0/23 | 512 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.88.0/22 | 1k | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.92.0/23 | 512 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.94.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.95.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.96.0/23 | 512 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.98.0/23 | 512 | RIPE NCC | DK | 7th Nov 1989 |
| 192.67.100.0/24 | 256 | RIPE NCC |  GB | 25th Jan 1990 |
| 192.67.101.0/24 | 256 | RIPE NCC | GB | 25th Jan 1990 |
| 192.67.102.0/24 | 256 | RIPE NCC | GB | 25th Jan 1990 |
| 192.67.103.0/24 | 256 | RIPE NCC | GB | 25th Jan 1990 |
| 192.67.104.0/24 | 256 | RIPE NCC | GB | 25th Jan 1990 |
| 192.67.105.0/24 | 256 | ARIN |  US | 27th Nov 2017 |
| 192.67.106.0/24 | 256 | ARIN | US | 27th Nov 2017 |
| 192.67.107.0/24 | 256 | ARIN | US | 25th Jan 1990 |
| 192.67.12.0/24 | 256 | APNIC |  AU | 18th Dec 1989 |
| 192.67.120.0/22 | 1k | ARIN | US | 25th Jan 1990 |
| 192.67.124.0/23 | 512 | ARIN | US | 25th Jan 1990 |
| 192.67.126.0/24 | 256 | ARIN | US | 25th Jan 1990 |
| 192.67.128.0/24 | 256 | ARIN | US | 31st Jan 1990 |
| 192.67.129.0/24 | 256 | ARIN | US | 31st Jan 1990 |
| 192.67.13.0/24 | 256 | ARIN | US | 14th Jul 1993 |
| 192.67.135.0/24 | 256 | RIPE NCC | GB | 31st Jan 1990 |
| 192.67.136.0/24 | 256 | ARIN | US | 31st Jan 1990 |
| 192.67.14.0/24 | 256 | ARIN | US | 14th Jul 1993 |
| 192.67.144.0/24 | 256 | ARIN | US | 31st Jan 1990 |
| 192.67.15.0/24 | 256 | ARIN | US | 18th Dec 1989 |
| 192.67.152.0/24 | 256 | ARIN | US | 31st Jan 1990 |
| 192.67.156.0/24 | 256 | ARIN | US | 31st Jan 1990 |
| 192.67.158.0/24 | 256 | ARIN | US | 31st Jan 1990 |
| 192.67.160.0/22 | 1k | ARIN | US | 18th Oct 2021 |
| 192.67.165.0/24 | 256 | ARIN | US | 31st Jan 1990 |
| 192.67.17.0/24 | 256 | ARIN | US | 18th Dec 1989 |
| 192.67.170.0/24 | 256 | RIPE NCC |  DE | 6th Feb 1990 |
| 192.67.173.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.174.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.175.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.176.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.177.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.178.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.179.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.18.0/24 | 256 | ARIN | US | 18th Dec 1989 |
| 192.67.180.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.181.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.182.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.183.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.184.0/24 | 256 | ARIN | US | 8th Feb 1990 |