0x4xxx Call signs on 30M

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Last seen: 2 days 11 hours ago
Joined: 2009/10/21 - 02:55
0x4xxx Call signs on 30M

I have been testing on 30M for several days and found many distant stations with call signs beginning with zero, a varied letter, a four, and then 3 additional letters. For example: 0F4IWX

Most of these stations are located in North and South polar regions.

None of the calls signs are known to QRZ or HamCall. Does anyone know who is operating these stations?