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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.78.15.0/24 | 256 | ARIN |  US | 3rd Oct 1989 |
| 192.78.150.0/23 | 512 | ARIN | US | 3rd Oct 1989 |
| 192.78.152.0/22 | 1k | ARIN | US | 3rd Oct 1989 |
| 192.78.156.0/22 | 1k | ARIN | US | 3rd Oct 1989 |
| 192.78.16.0/24 | 256 | ARIN | US | 3rd Oct 1989 |
| 192.78.17.0/24 | 256 | ARIN | US | 3rd Oct 1989 |
| 192.78.176.0/22 | 1k | ARIN | US | 3rd Oct 1989 |
| 192.78.18.0/23 | 512 | ARIN | US | 3rd Oct 1989 |
| 192.78.180.0/23 | 512 | ARIN | US | 3rd Oct 1989 |
| 192.78.183.0/24 | 256 | ARIN | US | 3rd Oct 1989 |
| 192.78.184.0/22 | 1k | ARIN | US | 3rd Oct 1989 |
| 192.78.188.0/24 | 256 | ARIN | US | 30th Jun 1990 |
| 192.78.189.0/24 | 256 | ARIN | US | 1st Jun 1990 |
| 192.78.190.0/23 | 512 | ARIN | US | 1st Jun 1990 |
| 192.78.2.0/23 | 512 | ARIN | US | 3rd Oct 1989 |
| 192.78.20.0/22 | 1k | ARIN | US | 3rd Oct 1989 |
| 192.78.208.0/21 | 2k | ARIN | US | 1st Jun 1990 |
| 192.78.220.0/23 | 512 | ARIN | US | 1st Jun 1990 |
| 192.78.222.0/23 | 512 | ARIN | US | 1st Jun 1990 |
| 192.78.224.0/21 | 2k | ARIN | US | 1st Jun 1990 |
| 192.78.232.0/21 | 2k | ARIN | US | 1st Jun 1990 |
| 192.78.24.0/22 | 1k | ARIN | US | 3rd Oct 1989 |
| 192.78.240.0/22 | 1k | ARIN | US | 1st Jun 1990 |
| 192.78.244.0/23 | 512 | ARIN | US | 1st Jun 1990 |
| 192.78.246.0/24 | 256 | ARIN | US | 1st Jun 1990 |
| 192.78.247.0/24 | 256 | ARIN | US | 1st Jun 1990 |
| 192.78.40.0/22 | 1k | ARIN | US | 3rd Oct 1989 |
| 192.78.44.0/24 | 256 | ARIN | US | 3rd Oct 1989 |
| 192.78.45.0/24 | 256 | ARIN | US | 3rd Oct 1989 |
| 192.78.5.0/24 | 256 | ARIN | US | 3rd Oct 1989 |
| 192.78.6.0/23 | 512 | ARIN | US | 3rd Oct 1989 |
| 192.78.64.0/21 | 2k | ARIN | US | 3rd Oct 1989 |
| 192.78.76.0/22 | 1k | ARIN | US | 3rd Oct 1989 |
| 192.78.80.0/20 | 4.1k | ARIN | US | 3rd Oct 1989 |
| 192.78.96.0/23 | 512 | ARIN | US | 3rd Oct 1989 |
| 192.78.98.0/24 | 256 | ARIN | US | 3rd Oct 1989 |
| 192.79.0.0/16 | 65.5k | ARIN | US | 26th Mar 1990 |
| 192.8.177.0/24 | 256 | ARIN | US | 26th Mar 1990 |
| 192.8.183.0/24 | 256 | ARIN | US | 26th Mar 1990 |
| 192.80.11.0/24 | 256 | ARIN | US | 24th Apr 1990 |
| 192.80.18.0/24 | 256 | ARIN | US | 26th Apr 1990 |
| 192.80.19.0/24 | 256 | ARIN | US | 26th Apr 1990 |
| 192.80.206.0/24 | 256 | ARIN | US | 6th Feb 2015 |
| 192.80.207.0/24 | 256 | ARIN | US | 23rd May 1990 |
| 192.80.208.0/24 | 256 | ARIN | US | 23rd May 1990 |
| 192.80.212.0/24 | 256 | ARIN | US | 31st May 1990 |
| 192.80.213.0/24 | 256 | ARIN | US | 31st May 1990 |
| 192.80.215.0/24 | 256 | ARIN | US | 11th Jun 1990 |
| 192.80.216.0/21 | 2k | ARIN | US | 11th Jun 1990 |
| 192.80.22.0/24 | 256 | ARIN | US | 26th Apr 1990 |