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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
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Countries with unannounced space registered through ARIN, largest first.
Unannounced blocks in United States
26,302 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.17.198.0/24 | 256 | ARIN |  US | 13th Jan 1993 |
| 198.17.2.0/24 | 256 | ARIN | US | 1st Dec 1992 |
| 198.17.20.0/22 | 1k | ARIN | US | 31st Oct 2012 |
| 198.17.202.0/24 | 256 | ARIN | US | 13th Jan 1993 |
| 198.17.203.0/24 | 256 | ARIN | US | 13th Jan 1993 |
| 198.17.204.0/24 | 256 | ARIN | US | 13th Jan 1993 |
| 198.17.205.0/24 | 256 | ARIN | US | 14th Jan 1993 |
| 198.17.206.0/24 | 256 | ARIN | US | 14th Jan 1993 |
| 198.17.209.0/24 | 256 | ARIN | US | 15th Jan 1993 |
| 198.17.214.0/24 | 256 | ARIN | US | 21st Jan 1993 |
| 198.17.217.0/24 | 256 | ARIN | US | 21st Jan 1993 |
| 198.17.218.0/24 | 256 | ARIN | US | 7th Jul 2026 |
| 198.17.220.0/24 | 256 | ARIN | US | 21st Jan 1993 |
| 198.17.221.0/24 | 256 | ARIN | US | 21st Jan 1993 |
| 198.17.224.0/24 | 256 | ARIN | US | 21st Jan 1993 |
| 198.17.225.0/24 | 256 | ARIN | US | 22nd Jan 1993 |
| 198.17.226.0/24 | 256 | ARIN | US | 22nd Jan 1993 |
| 198.17.227.0/24 | 256 | ARIN | US | 22nd Jan 1993 |
| 198.17.229.0/24 | 256 | ARIN | US | 22nd Jan 1993 |
| 198.17.233.0/24 | 256 | ARIN | US | 26th Jun 2024 |
| 198.17.234.0/24 | 256 | ARIN | US | 22nd Jan 1993 |
| 198.17.235.0/24 | 256 | ARIN | US | 22nd Jan 1993 |
| 198.17.238.0/24 | 256 | ARIN | US | 25th Jan 1993 |
| 198.17.239.0/24 | 256 | ARIN | US | 25th Jan 1993 |
| 198.17.244.0/24 | 256 | ARIN | US | 4th Jan 1996 |
| 198.17.245.0/24 | 256 | ARIN | US | 25th Jan 1993 |
| 198.17.246.0/24 | 256 | ARIN | US | 25th Jan 1993 |
| 198.17.247.0/24 | 256 | ARIN | US | 25th Jan 1993 |
| 198.17.249.0/24 | 256 | ARIN | US | 25th Jan 1993 |
| 198.17.250.0/24 | 256 | ARIN | US | 25th Jan 1993 |
| 198.17.252.0/24 | 256 | ARIN | US | 25th Jan 1993 |
| 198.17.253.0/24 | 256 | ARIN | US | 25th Jan 1993 |
| 198.17.254.0/24 | 256 | ARIN | US | 25th Jan 1993 |
| 198.17.31.0/24 | 256 | ARIN | US | 9th Dec 1992 |
| 198.17.33.0/24 | 256 | ARIN | US | 9th Dec 1992 |
| 198.17.34.0/24 | 256 | ARIN | US | 9th Dec 1992 |
| 198.17.35.0/24 | 256 | ARIN | US | 9th Dec 1992 |
| 198.17.36.0/24 | 256 | ARIN | US | 9th Dec 1992 |
| 198.17.37.0/24 | 256 | ARIN | US | 9th Dec 1992 |
| 198.17.38.0/24 | 256 | ARIN | US | 9th Dec 1992 |
| 198.17.39.0/24 | 256 | ARIN | US | 9th Dec 1992 |
| 198.17.41.0/24 | 256 | ARIN | US | 11th Dec 1992 |
| 198.17.45.0/24 | 256 | ARIN | US | 11th Dec 1992 |
| 198.17.48.0/24 | 256 | ARIN | US | 11th Dec 1992 |
| 198.17.49.0/24 | 256 | ARIN | US | 11th Dec 1992 |
| 198.17.5.0/24 | 256 | ARIN | US | 3rd Dec 1992 |
| 198.17.57.0/24 | 256 | ARIN | US | 16th Dec 1992 |
| 198.17.59.0/24 | 256 | ARIN | US | 16th Dec 1992 |
| 198.17.6.0/24 | 256 | ARIN | US | 3rd Dec 1992 |
| 198.17.62.0/24 | 256 | ARIN | US | 16th Dec 1992 |