From https://dx-code.com/

DX Code of Conduct

1. I will listen, and listen, and then listen again before calling.

2. I will only call if I can copy the DX station properly.

3. I will not trust the DX cluster and will be sure of the DX station's call sign before calling.

4. I will not interfere with the DX station nor anyone calling and will never tune up on the DX frequency or in the QSX slot.

5. I will wait for the DX station to end a contact before I call.

6. I will always send my full call sign.

7. I will call and then listen for a reasonable interval. I will not call continuously.

8. I will not transmit when the DX operator calls another call sign, not mine.

9. I will not transmit when the DX operator queries a call sign not like mine.

10. I will not transmit when the DX station requests geographic areas other than mine.

11. When the DX operator calls me, I will not repeat my call sign unless I think he has copied it incorrectly.

12. I will be thankful if and when I do make a contact.

13. I will respect my fellow hams and conduct myself so as to earn their respect.