Master bill of lading and house bill of lading
When a forwarder or NVOCC consolidates cargo, the ocean line issues a master bill of lading (MBL) to the forwarder, and the forwarder issues a house bill of lading (HBL) to each shipper. The ocean line only knows the MBL. The HBL uses the forwarder's own numbering, so it cannot be tracked on the line's site. To follow your cargo, track the MBL or the container number and keep the HBL as a reference, so your team and your customer search by whichever number they hold.