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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,256 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.58.6.0/24 | 256 | ARIN |  US | 9th Feb 1993 |
| 198.59.128.0/22 | 1k | ARIN | US | 9th Feb 1993 |
| 198.59.132.0/23 | 512 | ARIN | US | 9th Feb 1993 |
| 198.59.134.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.59.145.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.59.152.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.59.154.0/23 | 512 | ARIN | US | 9th Feb 1993 |
| 198.59.179.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.59.180.0/22 | 1k | ARIN | US | 9th Feb 1993 |
| 198.59.184.0/23 | 512 | ARIN | US | 9th Feb 1993 |
| 198.59.186.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.59.61.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.59.62.0/23 | 512 | ARIN | US | 9th Feb 1993 |
| 198.59.64.0/23 | 512 | ARIN | US | 9th Feb 1993 |
| 198.59.66.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.59.71.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.59.72.0/22 | 1k | ARIN | US | 9th Feb 1993 |
| 198.60.0.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.60.1.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.60.111.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.60.112.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.60.115.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.60.116.0/22 | 1k | ARIN | US | 9th Feb 1993 |
| 198.60.120.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.60.132.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.60.17.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.60.18.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.60.196.0/22 | 1k | ARIN | US | 9th Feb 1993 |
| 198.60.20.0/23 | 512 | ARIN | US | 9th Feb 1993 |
| 198.60.200.0/21 | 2k | ARIN | US | 9th Feb 1993 |
| 198.60.216.0/24 | 256 | RIPE NCC |  SI | 9th Feb 1993 |
| 198.60.218.0/23 | 512 | ARIN | US | 9th Feb 1993 |
| 198.60.220.0/22 | 1k | ARIN | US | 9th Feb 1993 |
| 198.60.228.0/22 | 1k | ARIN | US | 9th Feb 1993 |
| 198.60.23.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.60.232.0/24 | 256 | ARIN | US | 2nd Feb 2026 |
| 198.60.24.0/21 | 2k | ARIN | US | 9th Feb 1993 |
| 198.60.248.0/21 | 2k | ARIN | US | 19th Mar 2026 |
| 198.60.32.0/21 | 2k | ARIN | US | 9th Feb 1993 |
| 198.60.40.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.60.43.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.60.44.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.60.45.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.60.46.0/23 | 512 | ARIN | US | 9th Feb 1993 |
| 198.60.48.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.60.49.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.60.50.0/23 | 512 | ARIN | US | 9th Feb 1993 |
| 198.60.52.0/23 | 512 | ARIN | US | 9th Feb 1993 |
| 198.60.54.0/24 | 256 | ARIN | US | 9th Feb 1993 |
| 198.60.55.0/24 | 256 | ARIN | US | 9th Feb 1993 |