If I don’t know the shipping line name, which SCAC should i use?

If you don’t know the name of the shipping line, but only the container number, 

You can request metadata by the following link: https://tracking.searates.com/tracking?type=CT&number=***********&sealine=****&api_key=********  

Metadata includes:

- the sealine SCAC code,

- container number,

- the last response update,

- total number of API calls/shipments,

- used calls and remaining calls/shipments.