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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
Browse by country
Countries with unannounced space registered through ARIN, largest first.
Unannounced blocks registered through ARIN
30,461 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 192.77.139.0/24 | 256 | ARIN | US | 23rd 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 |
| 192.77.58.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.59.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.6.0/24 | 256 | ARIN | US | 30th Jun 1990 |
| 192.77.60.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.61.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.62.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.64.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.65.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.66.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.67.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.68.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.73.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.74.0/24 | 256 | ARIN | CA | 6th Nov 1990 |