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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 the most unannounced blocks, largest first.
Unannounced blocks
85,221 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.84.3.0/24 | 256 | ARIN |  US | 8th Oct 1990 |
| 192.84.30.0/24 | 256 | RIPE NCC |  NL | 23rd Oct 1990 |
| 192.84.31.0/24 | 256 | ARIN | US | 23rd Oct 1990 |
| 192.84.32.0/24 | 256 | RIPE NCC |  NO | 23rd Oct 1990 |
| 192.84.33.0/24 | 256 | RIPE NCC | NO | 23rd Oct 1990 |
| 192.84.40.0/21 | 2k | ARIN | US | 23rd Oct 1990 |
| 192.84.55.0/24 | 256 | ARIN | US | 26th Oct 1990 |
| 192.84.56.0/24 | 256 | ARIN | US | 23rd Oct 1990 |
| 192.84.57.0/24 | 256 | ARIN | US | 23rd Oct 1990 |
| 192.84.58.0/24 | 256 | ARIN | US | 23rd Oct 1990 |
| 192.84.59.0/24 | 256 | ARIN | US | 23rd Oct 1990 |
| 192.84.60.0/24 | 256 | ARIN | US | 23rd Oct 1990 |
| 192.84.61.0/24 | 256 | ARIN | US | 23rd Oct 1990 |
| 192.84.63.0/24 | 256 | ARIN | US | 23rd Oct 1990 |
| 192.84.64.0/24 | 256 | ARIN | US | 23rd Oct 1990 |
| 192.84.65.0/24 | 256 | ARIN | US | 23rd Oct 1990 |
| 192.84.66.0/24 | 256 | ARIN | US | 23rd Oct 1990 |
| 192.84.67.0/24 | 256 | ARIN | US | 23rd Oct 1990 |
| 192.84.7.0/24 | 256 | ARIN | US | 30th Jun 1990 |
| 192.84.70.0/24 | 256 | ARIN | US | 23rd Oct 1990 |
| 192.84.8.0/24 | 256 | ARIN | US | 30th Jun 1990 |
| 192.84.80.0/24 | 256 | RIPE NCC |  GB | 26th Oct 1990 |
| 192.84.81.0/24 | 256 | RIPE NCC | GB | 26th Oct 1990 |
| 192.84.82.0/24 | 256 | RIPE NCC | GB | 26th Oct 1990 |
| 192.84.83.0/24 | 256 | RIPE NCC | GB | 26th Oct 1990 |
| 192.84.84.0/24 | 256 | RIPE NCC | GB | 26th Oct 1990 |
| 192.84.87.0/24 | 256 | RIPE NCC |  IT | 26th Oct 1990 |
| 192.84.91.0/24 | 256 | RIPE NCC |  HR | 26th Oct 1990 |
| 192.84.92.0/24 | 256 | RIPE NCC | HR | 26th Oct 1990 |
| 192.84.93.0/24 | 256 | RIPE NCC | HR | 26th Oct 1990 |
| 192.84.94.0/24 | 256 | RIPE NCC | HR | 26th Oct 1990 |
| 192.84.96.0/24 | 256 | RIPE NCC | HR | 26th Oct 1990 |
| 192.84.98.0/24 | 256 | RIPE NCC | HR | 26th Oct 1990 |
| 192.86.10.0/24 | 256 | ARIN | US | 23rd May 1994 |
| 192.86.11.0/24 | 256 | RIPE NCC |  RU | 16th Nov 1990 |
| 192.86.12.0/24 | 256 | APNIC |  BD | 14th Aug 2026 |
| 192.86.120.0/24 | 256 | ARIN | US | 3rd Dec 1990 |
| 192.86.121.0/24 | 256 | ARIN | US | 3rd Dec 1990 |
| 192.86.123.0/24 | 256 | ARIN | US | 3rd Dec 1990 |
| 192.86.124.0/24 | 256 | ARIN | US | 3rd Dec 1990 |
| 192.86.127.0/24 | 256 | RIPE NCC | GB | 4th Aug 1993 |
| 192.86.13.0/24 | 256 | ARIN | US | 16th Nov 1990 |
| 192.86.131.0/24 | 256 | ARIN | US | 6th Dec 1990 |
| 192.86.134.0/24 | 256 | RIPE NCC | GB | 6th Dec 1990 |
| 192.86.135.0/24 | 256 | ARIN | US | 6th Dec 1990 |
| 192.86.136.0/24 | 256 | ARIN | US | 6th Dec 1990 |
| 192.86.137.0/24 | 256 | RIPE NCC | GB | 6th Dec 1990 |
| 192.86.140.0/24 | 256 | ARIN | US | 6th Dec 1990 |
| 192.86.141.0/24 | 256 | ARIN | US | 6th Dec 1990 |
| 192.86.142.0/24 | 256 | ARIN | US | 6th Dec 1990 |