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
6925436066
JD014600005489240100
Ps: You can also track your DHL tracking number in trackingmore.com