DHL tracking number format

Usually the DHL tracking number (awb) is a 10 digit numeric number, but according to DHL tracking number tracked in Trackingmore.com，we found a DHL tracking number might be:

9 digits
10 digits
JD + 18 digits
JJD + 16 digits

DHL tracking number example

6795778721
7201115305
6781103722
9067813484
5021749272
5093774140
9236890655
2381292690

6925436066

JD014600005489240100

Ps: You can also track your DHL tracking number in trackingmore.com