TNT tracking number format is usually comprised of 9 digits or starts with "GD", then 6 digits and ends with "WW". However, tracking numbers as follows is also a possible TNT tracking number.
6 digits
GE + 9 digits + WW
GE + 9 digits + US
GE + 9 digits + CN
TNT tracking number example
GD715371925WW
GD165194453WW
GD165194776WW
GD632306561WW
GE695447441WW
199863650
177847807
506823406
542020010
TNT Express, a subsidiary of FedEx, provides international delivery services.
You can also track your TNT tracking number on trackingmore.com