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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,201 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.44.41.0/24 | 256 | RIPE NCC |  FR | 15th Dec 1988 |
| 192.44.42.0/24 | 256 | RIPE NCC | FR | 15th Dec 1988 |
| 192.44.43.0/24 | 256 | RIPE NCC | FR | 15th Dec 1988 |
| 192.44.44.0/24 | 256 | RIPE NCC | FR | 15th Dec 1988 |
| 192.44.45.0/24 | 256 | RIPE NCC | FR | 15th Dec 1988 |
| 192.44.46.0/24 | 256 | RIPE NCC | FR | 15th Dec 1988 |
| 192.44.47.0/24 | 256 | RIPE NCC | FR | 15th Dec 1988 |
| 192.44.48.0/24 | 256 | RIPE NCC | FR | 15th Dec 1988 |
| 192.44.49.0/24 | 256 | RIPE NCC | FR | 15th Dec 1988 |
| 192.44.50.0/24 | 256 | RIPE NCC | FR | 12th Apr 1993 |
| 192.44.51.0/24 | 256 | RIPE NCC | FR | 15th Dec 1988 |
| 192.44.52.0/24 | 256 | RIPE NCC | FR | 12th Apr 1993 |
| 192.44.53.0/24 | 256 | RIPE NCC | FR | 15th Dec 1988 |
| 192.44.54.0/24 | 256 | RIPE NCC | FR | 15th Dec 1988 |
| 192.44.55.0/24 | 256 | RIPE NCC | FR | 15th Dec 1988 |
| 192.44.56.0/24 | 256 | RIPE NCC | FR | 15th Dec 1988 |
| 192.44.57.0/24 | 256 | RIPE NCC | FR | 15th Dec 1988 |
| 192.44.58.0/24 | 256 | RIPE NCC | FR | 15th Dec 1988 |
| 192.44.59.0/24 | 256 | RIPE NCC | FR | 15th Dec 1988 |
| 192.44.60.0/24 | 256 | RIPE NCC | FR | 13th Mar 1995 |
| 192.44.61.0/24 | 256 | RIPE NCC | FR | 15th Dec 1988 |
| 192.44.62.0/24 | 256 | RIPE NCC | FR | 15th Dec 1988 |
| 192.44.64.0/24 | 256 | RIPE NCC | FR | 1st Jan 1984 |
| 192.44.65.0/24 | 256 | RIPE NCC | FR | 15th Dec 1988 |
| 192.44.67.0/24 | 256 | RIPE NCC | FR | 6th Jun 1996 |
| 192.44.71.0/24 | 256 | RIPE NCC | FR | 9th Dec 1992 |
| 192.44.72.0/24 | 256 | RIPE NCC | FR | 15th Dec 1988 |
| 192.44.73.0/24 | 256 | RIPE NCC | FR | 15th Dec 1988 |
| 192.44.74.0/24 | 256 | RIPE NCC | FR | 9th Dec 1992 |
| 192.44.79.0/24 | 256 | RIPE NCC | FR | 19th Feb 1997 |
| 192.44.80.0/24 | 256 | RIPE NCC | FR | 15th Dec 1988 |
| 192.46.104.0/22 | 1k | ARIN |  US | 20th Dec 1988 |
| 192.46.108.0/23 | 512 | ARIN | US | 20th Dec 1988 |
| 192.46.128.0/20 | 4.1k | ARIN |  CA | 20th Dec 1988 |
| 192.46.144.0/21 | 2k | ARIN | US | 20th Dec 1988 |
| 192.46.152.0/24 | 256 | ARIN | US | 20th Dec 1988 |
| 192.46.153.0/24 | 256 | ARIN | US | 20th Dec 1988 |
| 192.46.154.0/23 | 512 | ARIN | US | 20th Dec 1988 |
| 192.46.156.0/24 | 256 | ARIN | US | 20th Dec 1988 |
| 192.46.157.0/24 | 256 | ARIN | US | 20th Dec 1988 |
| 192.46.158.0/23 | 512 | ARIN | US | 20th Dec 1988 |
| 192.46.160.0/24 | 256 | ARIN | US | 20th Dec 1988 |
| 192.46.161.0/24 | 256 | ARIN | US | 20th Dec 1988 |
| 192.46.162.0/23 | 512 | ARIN | US | 20th Dec 1988 |
| 192.46.164.0/22 | 1k | ARIN | US | 20th Dec 1988 |
| 192.46.168.0/23 | 512 | ARIN | US | 20th Dec 1988 |
| 192.46.170.0/24 | 256 | ARIN | US | 20th Dec 1988 |
| 192.46.171.0/24 | 256 | ARIN | US | 20th Dec 1988 |
| 192.46.180.0/22 | 1k | ARIN | US | 20th Dec 1988 |
| 192.46.192.0/24 | 256 | ARIN | US | 20th Dec 1988 |