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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.77.58.0/24 | 256 | ARIN |  CA | 6th Nov 1990 |
| 192.77.59.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.6.0/24 | 256 | ARIN |  US | 30th Jun 1990 |
| 192.77.60.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.61.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.62.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.64.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.65.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.66.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.67.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.68.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.73.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.74.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.75.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.76.0/24 | 256 | ARIN | US | 29th May 1990 |
| 192.77.78.0/23 | 512 | ARIN | US | 7th Nov 1990 |
| 192.77.96.0/24 | 256 | ARIN | US | 7th Nov 1990 |
| 192.77.97.0/24 | 256 | ARIN | US | 8th Nov 1990 |
| 192.78.0.0/24 | 256 | ARIN | US | 16th Dec 2014 |
| 192.78.1.0/24 | 256 | ARIN | US | 3rd Oct 1989 |
| 192.78.100.0/22 | 1k | ARIN | US | 3rd Oct 1989 |
| 192.78.104.0/21 | 2k | ARIN | US | 3rd Oct 1989 |
| 192.78.116.0/22 | 1k | ARIN | US | 3rd Oct 1989 |
| 192.78.120.0/22 | 1k | ARIN | US | 3rd Oct 1989 |
| 192.78.124.0/24 | 256 | ARIN | US | 3rd Oct 1989 |
| 192.78.125.0/24 | 256 | ARIN | US | 3rd Oct 1989 |
| 192.78.126.0/23 | 512 | ARIN | US | 3rd Oct 1989 |
| 192.78.128.0/23 | 512 | ARIN | US | 3rd Oct 1989 |
| 192.78.130.0/24 | 256 | ARIN | US | 3rd Oct 1989 |
| 192.78.131.0/24 | 256 | ARIN | US | 3rd Oct 1989 |
| 192.78.132.0/22 | 1k | ARIN | US | 3rd Oct 1989 |
| 192.78.144.0/22 | 1k | ARIN | US | 3rd Oct 1989 |
| 192.78.148.0/24 | 256 | ARIN | US | 3rd Oct 1989 |
| 192.78.149.0/24 | 256 | ARIN | US | 3rd Oct 1989 |
| 192.78.15.0/24 | 256 | ARIN | US | 3rd Oct 1989 |
| 192.78.150.0/23 | 512 | ARIN | US | 3rd Oct 1989 |
| 192.78.152.0/22 | 1k | ARIN | US | 3rd Oct 1989 |
| 192.78.156.0/22 | 1k | ARIN | US | 3rd Oct 1989 |
| 192.78.16.0/24 | 256 | ARIN | US | 3rd Oct 1989 |
| 192.78.160.0/20 | 4.1k | RIPE NCC |  DE | 3rd Oct 1989 |
| 192.78.17.0/24 | 256 | ARIN | US | 3rd Oct 1989 |
| 192.78.176.0/22 | 1k | ARIN | US | 3rd Oct 1989 |
| 192.78.18.0/23 | 512 | ARIN | US | 3rd Oct 1989 |
| 192.78.180.0/23 | 512 | ARIN | US | 3rd Oct 1989 |
| 192.78.183.0/24 | 256 | ARIN | US | 3rd Oct 1989 |
| 192.78.184.0/22 | 1k | ARIN | US | 3rd Oct 1989 |
| 192.78.188.0/24 | 256 | ARIN | US | 30th Jun 1990 |
| 192.78.189.0/24 | 256 | ARIN | US | 1st Jun 1990 |
| 192.78.190.0/23 | 512 | ARIN | US | 1st Jun 1990 |
| 192.78.192.0/20 | 4.1k | RIPE NCC | DE | 1st Jun 1990 |