Tools
We suggest you read and live by the DX Code of Conduct found here.

Call sign look up QRZ.com

QSL Manager look up IK3QAR's site

QSL Manager look up QSLinfo.de

Impressive list of look up sites by K3WWP

Propogation tool: Grayline map

NG3K's list of upcoming announced DXpeditions and contest expeditions.
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F T T San Diego DX Club
T T International DX Foundation
T T E B C G I K N S