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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 the most unannounced blocks, largest first.
Unannounced blocks
85,221 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.77.11.0/24 | 256 | RIPE NCC |  CH | 17th Oct 1990 |
| 192.77.112.0/24 | 256 | ARIN |  US | 15th Aug 1991 |
| 192.77.118.0/24 | 256 | ARIN | US | 21st Aug 1991 |
| 192.77.119.0/24 | 256 | ARIN | US | 22nd Aug 1991 |
| 192.77.124.0/24 | 256 | ARIN | US | 22nd Aug 1991 |
| 192.77.127.0/24 | 256 | ARIN | US | 22nd Aug 1991 |
| 192.77.128.0/24 | 256 | ARIN | US | 31st Dec 2014 |
| 192.77.129.0/24 | 256 | ARIN | US | 22nd Aug 1991 |
| 192.77.13.0/24 | 256 | ARIN | US | 17th Oct 1990 |
| 192.77.130.0/24 | 256 | ARIN | US | 23rd Aug 1991 |
| 192.77.131.0/24 | 256 | ARIN | US | 23rd Aug 1991 |
| 192.77.132.0/22 | 1k | RIPE NCC |  GB | 23rd Aug 1991 |
| 192.77.136.0/23 | 512 | RIPE NCC | GB | 23rd Aug 1991 |
| 192.77.138.0/24 | 256 | RIPE NCC | GB | 23rd Aug 1991 |
| 192.77.139.0/24 | 256 | ARIN | US | 23rd Aug 1991 |
| 192.77.140.0/24 | 256 | RIPE NCC |  ES | 26th Aug 1991 |
| 192.77.141.0/24 | 256 | RIPE NCC | ES | 26th Aug 1991 |
| 192.77.142.0/24 | 256 | ARIN | US | 27th Aug 1991 |
| 192.77.148.0/24 | 256 | ARIN | US | 9th Sept 1991 |
| 192.77.149.0/24 | 256 | ARIN | US | 9th Sept 1991 |
| 192.77.15.0/24 | 256 | ARIN | US | 17th Oct 1990 |
| 192.77.150.0/24 | 256 | ARIN | US | 9th Sept 1991 |
| 192.77.151.0/24 | 256 | ARIN | US | 23rd Sept 1991 |
| 192.77.152.0/21 | 2k | ARIN | US | 23rd Sept 1991 |
| 192.77.16.0/24 | 256 | ARIN | US | 17th Oct 1990 |
| 192.77.160.0/21 | 2k | ARIN | US | 23rd Sept 1991 |
| 192.77.168.0/23 | 512 | ARIN | US | 23rd Sept 1991 |
| 192.77.170.0/24 | 256 | ARIN | US | 23rd Sept 1991 |
| 192.77.172.0/24 | 256 | ARIN | US | 28th Jan 1992 |
| 192.77.174.0/24 | 256 | ARIN | US | 28th Jan 1992 |
| 192.77.175.0/24 | 256 | ARIN | US | 28th Jan 1992 |
| 192.77.18.0/24 | 256 | ARIN | US | 17th Oct 1990 |
| 192.77.186.0/24 | 256 | ARIN | US | 28th Jan 1992 |
| 192.77.19.0/24 | 256 | ARIN | US | 17th Oct 1990 |
| 192.77.2.0/23 | 512 | ARIN | US | 30th Jun 1990 |
| 192.77.23.0/24 | 256 | ARIN | US | 9th Nov 1990 |
| 192.77.232.0/24 | 256 | ARIN | US | 28th Jan 1992 |
| 192.77.233.0/24 | 256 | ARIN | US | 28th Jan 1992 |
| 192.77.234.0/24 | 256 | ARIN | US | 28th Jan 1992 |
| 192.77.24.0/24 | 256 | ARIN | US | 17th Oct 1990 |
| 192.77.25.0/24 | 256 | ARIN | US | 17th Oct 1990 |
| 192.77.4.0/23 | 512 | ARIN | US | 30th Jun 1990 |
| 192.77.47.0/24 | 256 | ARIN |  CA | 6th Nov 1990 |
| 192.77.48.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.52.0/24 | 256 | ARIN | CA | 29th Oct 1992 |
| 192.77.53.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.54.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.55.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.56.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.57.0/24 | 256 | ARIN | CA | 6th Nov 1990 |