| Security vulnerabilities in IEEE 802.22 Recent countries visiting this post |  |
 | 6 | United States |
 | 1 | Nigeria |
 | 1 | Russian Federation |
 | 1 | Germany |
| Security vulnerabilities in IEEE 802.22 Recent countries visiting this post | |
| 6 | United States |
| 1 | Nigeria |
| 1 | Russian Federation |
| 1 | Germany |