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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
26,289 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.160.12.0/24 | 256 | ARIN |  US | 22nd Apr 1992 |
| 192.160.122.0/24 | 256 | ARIN | US | 20th May 1992 |
| 192.160.124.0/24 | 256 | ARIN | US | 21st May 1992 |
| 192.160.125.0/24 | 256 | ARIN | US | 21st May 1992 |
| 192.160.129.0/24 | 256 | ARIN | US | 21st May 1992 |
| 192.160.133.0/24 | 256 | ARIN | US | 21st May 1992 |
| 192.160.134.0/24 | 256 | ARIN | US | 21st May 1992 |
| 192.160.135.0/24 | 256 | ARIN | US | 22nd May 1992 |
| 192.160.136.0/24 | 256 | ARIN | US | 22nd May 1992 |
| 192.160.137.0/24 | 256 | ARIN | US | 22nd May 1992 |
| 192.160.139.0/24 | 256 | ARIN | US | 22nd May 1992 |
| 192.160.14.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 192.160.140.0/24 | 256 | ARIN | US | 22nd May 1992 |
| 192.160.141.0/24 | 256 | ARIN | US | 22nd May 1992 |
| 192.160.147.0/24 | 256 | ARIN | US | 27th May 1992 |
| 192.160.149.0/24 | 256 | ARIN | US | 27th May 1992 |
| 192.160.150.0/24 | 256 | ARIN | US | 27th May 1992 |
| 192.160.151.0/24 | 256 | ARIN | US | 27th May 1992 |
| 192.160.153.0/24 | 256 | ARIN | US | 27th May 1992 |
| 192.160.154.0/24 | 256 | ARIN | US | 27th May 1992 |
| 192.160.168.0/24 | 256 | ARIN | US | 1st Jun 1992 |
| 192.160.17.0/24 | 256 | ARIN | US | 22nd Apr 1992 |
| 192.160.173.0/24 | 256 | ARIN | US | 2nd Jun 1992 |
| 192.160.180.0/24 | 256 | ARIN | US | 2nd Jun 1992 |
| 192.160.181.0/24 | 256 | ARIN | US | 2nd Jun 1992 |
| 192.160.184.0/24 | 256 | ARIN | US | 18th Nov 2022 |
| 192.160.185.0/24 | 256 | ARIN | US | 3rd Jun 1992 |
| 192.160.186.0/24 | 256 | ARIN | US | 3rd Jun 1992 |
| 192.160.187.0/24 | 256 | ARIN | US | 3rd Jun 1992 |
| 192.160.189.0/24 | 256 | ARIN | US | 3rd Jun 1992 |
| 192.160.190.0/24 | 256 | ARIN | US | 3rd Jun 1992 |
| 192.160.191.0/24 | 256 | ARIN | US | 3rd Jun 1992 |
| 192.160.199.0/24 | 256 | ARIN | US | 9th Jun 1992 |
| 192.160.2.0/24 | 256 | ARIN | US | 21st Apr 1992 |
| 192.160.20.0/24 | 256 | ARIN | US | 22nd Apr 1992 |
| 192.160.200.0/23 | 512 | ARIN | US | 9th Jun 1992 |
| 192.160.202.0/24 | 256 | ARIN | US | 9th Jun 1992 |
| 192.160.203.0/24 | 256 | ARIN | US | 9th Jun 1992 |
| 192.160.214.0/24 | 256 | ARIN | US | 1st Jul 2026 |
| 192.160.230.0/24 | 256 | ARIN | US | 11th Jun 1992 |
| 192.160.234.0/24 | 256 | ARIN | US | 11th Jun 1992 |
| 192.160.235.0/24 | 256 | ARIN | US | 11th Jun 1992 |
| 192.160.236.0/24 | 256 | ARIN | US | 6th Dec 2017 |
| 192.160.238.0/24 | 256 | ARIN | US | 6th Dec 2017 |
| 192.160.239.0/24 | 256 | ARIN | US | 6th Dec 2017 |
| 192.160.24.0/24 | 256 | ARIN | US | 16th Sept 2015 |
| 192.160.240.0/24 | 256 | ARIN | US | 6th Dec 2017 |
| 192.160.241.0/24 | 256 | ARIN | US | 15th Jun 1992 |
| 192.160.25.0/24 | 256 | ARIN | US | 24th Apr 1992 |
| 192.160.253.0/24 | 256 | ARIN | US | 15th Jun 1992 |