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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
26,295 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.6.11.0/24 | 256 | ARIN |  US | 26th Aug 1983 |
| 192.6.110.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.112.0/22 | 1k | ARIN | US | 26th Aug 1983 |
| 192.6.118.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.12.0/22 | 1k | ARIN | US | 26th Aug 1983 |
| 192.6.122.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.123.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.126.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.127.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.128.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.129.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.130.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.131.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.132.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.133.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.134.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.136.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.140.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.142.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.144.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.146.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.147.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.148.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.150.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.151.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.152.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.156.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.157.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.16.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.162.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.164.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.166.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.167.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.168.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.17.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.170.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.18.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.180.0/22 | 1k | ARIN | US | 26th Aug 1983 |
| 192.6.184.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.185.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.186.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.188.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.19.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.190.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.192.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.20.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.200.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.202.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.203.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.204.0/23 | 512 | ARIN | US | 26th Aug 1983 |