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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
26,300 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.94.19.0/24 | 256 | ARIN |  US | 7th Feb 1991 |
| 192.94.2.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.20.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.201.0/24 | 256 | ARIN | US | 28th Feb 1991 |
| 192.94.207.0/24 | 256 | ARIN | US | 28th Feb 1991 |
| 192.94.211.0/24 | 256 | ARIN | US | 28th Feb 1991 |
| 192.94.213.0/24 | 256 | ARIN | US | 28th Feb 1991 |
| 192.94.215.0/24 | 256 | ARIN | US | 28th Feb 1991 |
| 192.94.217.0/24 | 256 | ARIN | US | 5th Mar 1991 |
| 192.94.218.0/24 | 256 | ARIN | US | 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 |
| 192.94.245.0/24 | 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 |
| 192.94.42.0/24 | 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 |
| 192.94.5.0/24 | 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 |
| 192.94.55.0/24 | 256 | ARIN | US | 15th Feb 1991 |
| 192.94.56.0/24 | 256 | ARIN | US | 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 |
| 192.94.77.0/24 | 256 | ARIN | US | 18th Nov 2019 |
| 192.94.79.0/24 | 256 | ARIN | US | 22nd Feb 1991 |
| 192.94.8.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.80.0/24 | 256 | ARIN | US | 22nd Feb 1991 |