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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
30,449 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.207.30.0/24 | 256 | ARIN |  US | 17th Aug 1992 |
| 192.207.32.0/24 | 256 | ARIN | US | 18th Aug 1992 |
| 192.207.34.0/23 | 512 | ARIN | US | 24th Apr 2015 |
| 192.207.37.0/24 | 256 | ARIN | US | 18th Aug 1992 |
| 192.207.38.0/23 | 512 | ARIN | US | 18th Aug 1992 |
| 192.207.4.0/22 | 1k | ARIN | US | 12th Aug 1992 |
| 192.207.43.0/24 | 256 | ARIN | US | 18th Aug 1992 |
| 192.207.44.0/24 | 256 | ARIN | US | 18th Aug 1992 |
| 192.207.48.0/24 | 256 | ARIN |  PR | 12th Jul 1994 |
| 192.207.49.0/24 | 256 | ARIN | US | 24th Jul 2015 |
| 192.207.50.0/24 | 256 | ARIN | US | 19th Aug 1992 |
| 192.207.51.0/24 | 256 | ARIN | US | 19th Aug 1992 |
| 192.207.52.0/23 | 512 | ARIN | US | 19th Aug 1992 |
| 192.207.54.0/24 | 256 | ARIN | US | 19th Aug 1992 |
| 192.207.60.0/23 | 512 | ARIN |  CA | 23rd Aug 2024 |
| 192.207.62.0/24 | 256 | ARIN | US | 9th Sept 2015 |
| 192.207.63.0/24 | 256 | ARIN | US | 20th Aug 1992 |
| 192.207.69.0/24 | 256 | ARIN | US | 20th Aug 1992 |
| 192.207.70.0/23 | 512 | ARIN | US | 20th Aug 1992 |
| 192.207.72.0/24 | 256 | ARIN | US | 20th Aug 1992 |
| 192.207.75.0/24 | 256 | ARIN | US | 21st Aug 1992 |
| 192.207.8.0/22 | 1k | ARIN | US | 12th Aug 1992 |
| 192.207.82.0/24 | 256 | ARIN | US | 21st Aug 1992 |
| 192.207.83.0/24 | 256 | ARIN | US | 21st Aug 1992 |
| 192.207.84.0/24 | 256 | ARIN | US | 21st Aug 1992 |
| 192.207.85.0/24 | 256 | ARIN | US | 21st Aug 1992 |
| 192.207.86.0/24 | 256 | ARIN | US | 21st Aug 1992 |
| 192.207.87.0/24 | 256 | ARIN | US | 21st Aug 1992 |
| 192.207.88.0/24 | 256 | ARIN | US | 4th Apr 1994 |
| 192.207.89.0/24 | 256 | ARIN | US | 21st Aug 1992 |
| 192.207.90.0/24 | 256 | ARIN | US | 21st Aug 1992 |
| 192.207.92.0/23 | 512 | ARIN | US | 21st Aug 1992 |
| 192.207.94.0/24 | 256 | ARIN | US | 21st Aug 1992 |
| 192.207.95.0/24 | 256 | ARIN | US | 25th Aug 1992 |
| 192.208.0.0/24 | 256 | ARIN | US | 20th Aug 2015 |
| 192.208.112.0/23 | 512 | ARIN | US | 29th Aug 1992 |
| 192.208.158.0/23 | 512 | ARIN | US | 24th Apr 2015 |
| 192.208.48.0/22 | 1k | ARIN | US | 26th Aug 1992 |
| 192.208.64.0/19 | 8.2k | ARIN | US | 29th Aug 1992 |
| 192.208.96.0/20 | 4.1k | ARIN | US | 29th Aug 1992 |
| 192.209.1.0/24 | 256 | ARIN | US | 14th Aug 1992 |
| 192.209.128.0/17 | 32.8k | ARIN | US | 19th Jul 1993 |
| 192.209.16.0/24 | 256 | ARIN | US | 14th Aug 1992 |
| 192.209.2.0/23 | 512 | ARIN | US | 14th Aug 1992 |
| 192.209.4.0/22 | 1k | ARIN | US | 14th Aug 1992 |
| 192.209.64.0/18 | 16.4k | ARIN | US | 14th Aug 1992 |
| 192.209.8.0/21 | 2k | ARIN | US | 14th Aug 1992 |
| 192.210.1.0/24 | 256 | ARIN | CA | 26th Aug 1992 |
| 192.210.2.0/23 | 512 | ARIN | CA | 26th Aug 1992 |
| 192.210.32.0/21 | 2k | ARIN | US | 28th Aug 1992 |