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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,279 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.22.226.0/24 | 256 | ARIN |  US | 15th Jan 1993 |
| 198.22.227.0/24 | 256 | ARIN | US | 15th Jan 1993 |
| 198.22.229.0/24 | 256 | ARIN | US | 15th Jan 1993 |
| 198.22.230.0/24 | 256 | ARIN | US | 15th Jan 1993 |
| 198.22.231.0/24 | 256 | ARIN | US | 15th Jan 1993 |
| 198.22.232.0/24 | 256 | ARIN | US | 15th Jan 1993 |
| 198.22.233.0/24 | 256 | ARIN | US | 15th Jan 1993 |
| 198.22.234.0/24 | 256 | ARIN | US | 19th Jan 1993 |
| 198.22.237.0/24 | 256 | ARIN |  CA | 19th Jan 1993 |
| 198.22.241.0/24 | 256 | ARIN | US | 19th Jan 1993 |
| 198.22.242.0/23 | 512 | ARIN | US | 19th Jan 1993 |
| 198.22.244.0/22 | 1k | ARIN | US | 19th Jan 1993 |
| 198.22.248.0/24 | 256 | ARIN | US | 19th Jan 1993 |
| 198.22.253.0/24 | 256 | ARIN | US | 29th Jul 2013 |
| 198.22.254.0/24 | 256 | ARIN | US | 22nd Jan 1993 |
| 198.22.28.0/24 | 256 | ARIN | US | 1st Dec 1992 |
| 198.22.29.0/24 | 256 | ARIN | US | 1st Dec 1992 |
| 198.22.38.0/24 | 256 | ARIN | US | 2nd Dec 1992 |
| 198.22.39.0/24 | 256 | ARIN | US | 2nd Dec 1992 |
| 198.22.4.0/24 | 256 | ARIN | US | 3rd Jul 2013 |
| 198.22.42.0/24 | 256 | ARIN | US | 2nd Dec 1992 |
| 198.22.45.0/24 | 256 | ARIN | US | 2nd Dec 1992 |
| 198.22.5.0/24 | 256 | ARIN | US | 1st Dec 1992 |
| 198.22.52.0/24 | 256 | ARIN | US | 4th Oct 2022 |
| 198.22.53.0/24 | 256 | ARIN | US | 3rd Dec 1992 |
| 198.22.54.0/23 | 512 | ARIN | US | 3rd Dec 1992 |
| 198.22.56.0/24 | 256 | ARIN | US | 3rd Dec 1992 |
| 198.22.57.0/24 | 256 | ARIN | US | 3rd Dec 1992 |
| 198.22.59.0/24 | 256 | ARIN | US | 3rd Dec 1992 |
| 198.22.6.0/23 | 512 | ARIN | US | 1st Dec 1992 |
| 198.22.62.0/24 | 256 | ARIN | US | 3rd Dec 1992 |
| 198.22.64.0/24 | 256 | ARIN | US | 3rd Dec 1992 |
| 198.22.65.0/24 | 256 | ARIN | US | 3rd Dec 1992 |
| 198.22.70.0/23 | 512 | ARIN | US | 7th Dec 1992 |
| 198.22.72.0/22 | 1k | ARIN | US | 7th Dec 1992 |
| 198.22.76.0/24 | 256 | ARIN | US | 7th Dec 1992 |
| 198.22.77.0/24 | 256 | ARIN | US | 7th Dec 1992 |
| 198.22.78.0/24 | 256 | ARIN | US | 11th Dec 1992 |
| 198.22.79.0/24 | 256 | ARIN | US | 11th Dec 1992 |
| 198.22.8.0/23 | 512 | ARIN | US | 1st Dec 1992 |
| 198.22.80.0/22 | 1k | ARIN | US | 14th Dec 1992 |
| 198.22.84.0/23 | 512 | ARIN | US | 14th Dec 1992 |
| 198.22.86.0/24 | 256 | ARIN | US | 14th Dec 1992 |
| 198.22.87.0/24 | 256 | ARIN | US | 15th Dec 1992 |
| 198.22.89.0/24 | 256 | ARIN | US | 15th Dec 1992 |
| 198.22.90.0/24 | 256 | ARIN | US | 15th Dec 1992 |
| 198.22.93.0/24 | 256 | RIPE NCC |  DE | 15th Dec 1992 |
| 198.22.94.0/24 | 256 | RIPE NCC | DE | 15th Dec 1992 |
| 198.22.95.0/24 | 256 | RIPE NCC | DE | 15th Dec 1992 |
| 198.22.96.0/24 | 256 | RIPE NCC | DE | 15th Dec 1992 |