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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.94.218.0/24 | 256 | ARIN |  US | 5th Mar 1991 |
| 192.94.221.0/24 | 256 | RIPE NCC |  RU | 5th Mar 1991 |
| 192.94.222.0/24 | 256 | ARIN | US | 5th Mar 1991 |
| 192.94.223.0/24 | 256 | ARIN | US | 5th Mar 1991 |
| 192.94.224.0/24 | 256 | ARIN | US | 5th Mar 1991 |
| 192.94.225.0/24 | 256 | ARIN | US | 5th Mar 1991 |
| 192.94.228.0/24 | 256 | ARIN | US | 4th Mar 1991 |
| 192.94.229.0/24 | 256 | ARIN | US | 4th Mar 1991 |
| 192.94.23.0/24 | 256 | ARIN | US | 8th Feb 1991 |
| 192.94.230.0/24 | 256 | ARIN | US | 4th Mar 1991 |
| 192.94.231.0/24 | 256 | ARIN | US | 4th Mar 1991 |
| 192.94.232.0/24 | 256 | ARIN | US | 4th Mar 1991 |
| 192.94.237.0/24 | 256 | ARIN | US | 6th Mar 1991 |
| 192.94.239.0/24 | 256 | RIPE NCC |  AT | 6th Mar 1991 |
| 192.94.240.0/24 | 256 | AFRINIC |  ZA | 6th Mar 1991 |
| 192.94.241.0/24 | 256 | AFRINIC | ZA | 6th Mar 1991 |
| 192.94.245.0/24 | 256 | ARIN | US | 6th Mar 1991 |
| 192.94.247.0/24 | 256 | ARIN | US | 6th Mar 1991 |
| 192.94.248.0/24 | 256 | ARIN | US | 6th Mar 1991 |
| 192.94.26.0/24 | 256 | ARIN | US | 8th Feb 1991 |
| 192.94.27.0/24 | 256 | ARIN | US | 8th Feb 1991 |
| 192.94.3.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.4.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.40.0/24 | 256 | ARIN |  CA | 12th Feb 1991 |
| 192.94.41.0/24 | 256 | APNIC |  AU | 13th Feb 1991 |
| 192.94.42.0/24 | 256 | ARIN | US | 13th Feb 1991 |
| 192.94.43.0/24 | 256 | ARIN | US | 13th Feb 1991 |
| 192.94.44.0/24 | 256 | ARIN | US | 13th Feb 1991 |
| 192.94.48.0/24 | 256 | ARIN | US | 15th Feb 1991 |
| 192.94.49.0/24 | 256 | ARIN | CA | 6th Feb 2015 |
| 192.94.5.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.50.0/24 | 256 | ARIN | US | 15th Feb 1991 |
| 192.94.51.0/24 | 256 | ARIN | US | 15th Feb 1991 |
| 192.94.52.0/24 | 256 | ARIN | US | 15th Feb 1991 |
| 192.94.53.0/24 | 256 | ARIN | US | 14th Feb 1991 |
| 192.94.54.0/24 | 256 | ARIN | CA | 15th Feb 1991 |
| 192.94.55.0/24 | 256 | ARIN | US | 15th Feb 1991 |
| 192.94.56.0/24 | 256 | ARIN | US | 15th Feb 1991 |
| 192.94.57.0/24 | 256 | RIPE NCC | AT | 15th Feb 1991 |
| 192.94.58.0/24 | 256 | RIPE NCC |  GB | 15th Feb 1991 |
| 192.94.59.0/24 | 256 | ARIN | US | 15th Feb 1991 |
| 192.94.6.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.60.0/24 | 256 | ARIN | US | 15th Feb 1991 |
| 192.94.65.0/24 | 256 | ARIN | US | 21st Feb 1991 |
| 192.94.69.0/24 | 256 | ARIN | US | 22nd Feb 1991 |
| 192.94.7.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.75.0/24 | 256 | ARIN | US | 22nd Feb 1991 |
| 192.94.76.0/24 | 256 | RIPE NCC |  DE | 22nd Feb 1991 |
| 192.94.77.0/24 | 256 | ARIN | US | 18th Nov 2019 |
| 192.94.78.0/24 | 256 | RIPE NCC | US | 12th Nov 2019 |