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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with unannounced space registered through ARIN, largest first.
Unannounced blocks in United States
26,315 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 198.222.0.0/16 | 65.5k | ARIN | US | 27th Mar 1997 |
| 198.225.160.0/22 | 1k | ARIN | US | 1st Apr 2025 |
| 198.225.164.0/24 | 256 | ARIN | US | 1st Apr 2025 |
| 198.225.166.0/24 | 256 | ARIN | US | 1st Apr 2025 |
| 198.225.189.0/24 | 256 | ARIN | US | 1st Apr 2025 |
| 198.225.190.0/23 | 512 | ARIN | US | 1st Apr 2025 |
| 198.225.194.0/24 | 256 | ARIN | US | 1st Apr 2025 |
| 198.225.196.0/24 | 256 | ARIN | US | 1st Apr 2025 |
| 198.225.200.0/24 | 256 | ARIN | US | 1st Apr 2025 |
| 198.225.204.0/22 | 1k | ARIN | US | 25th Mar 2025 |
| 198.225.208.0/20 | 4.1k | ARIN | US | 25th Mar 2025 |
| 198.228.100.0/24 | 256 | ARIN | US | 25th Feb 2025 |
| 198.228.104.0/21 | 2k | ARIN | US | 25th Feb 2025 |
| 198.228.112.0/20 | 4.1k | ARIN | US | 25th Feb 2025 |
| 198.228.128.0/22 | 1k | ARIN | US | 25th Feb 2025 |
| 198.228.132.0/22 | 1k | ARIN | US | 1st Apr 2025 |
| 198.228.136.0/21 | 2k | ARIN | US | 1st Apr 2025 |
| 198.228.144.0/20 | 4.1k | ARIN | US | 1st Apr 2025 |
| 198.228.160.0/19 | 8.2k | ARIN | US | 1st Apr 2025 |
| 198.228.64.0/20 | 4.1k | ARIN | US | 1st Apr 2025 |
| 198.228.80.0/22 | 1k | ARIN | US | 1st Apr 2025 |
| 198.228.84.0/23 | 512 | ARIN | US | 1st Apr 2025 |
| 198.228.91.0/24 | 256 | ARIN | US | 25th Feb 2025 |
| 198.228.92.0/22 | 1k | ARIN | US | 25th Feb 2025 |
| 198.228.96.0/22 | 1k | ARIN | US | 28th Aug 2026 |
| 198.229.0.0/18 | 16.4k | ARIN | US | 7th Apr 2025 |
| 198.229.112.0/21 | 2k | ARIN | US | 7th Apr 2025 |
| 198.229.120.0/22 | 1k | ARIN | US | 7th Apr 2025 |
| 198.229.124.0/22 | 1k | ARIN | US | 25th Mar 2025 |
| 198.229.128.0/19 | 8.2k | ARIN | US | 25th Mar 2025 |
| 198.229.184.0/21 | 2k | ARIN | US | 1st Apr 2025 |
| 198.229.192.0/22 | 1k | ARIN | US | 1st Apr 2025 |
| 198.229.196.0/22 | 1k | ARIN | US | 25th Mar 2025 |
| 198.229.200.0/21 | 2k | ARIN | US | 25th Mar 2025 |