The default port for iMaster NCE-Campus northbound RESTful APIs is 18006. This port is used by external platforms and applications to interact with iMaster NCE via its open API interface.

Exact Extract - Huawei iMaster NCE-Campus API Integration Guide:

“Northbound interfaces of iMaster NCE-Campus are accessible via port 18006 by default. This allows external systems to use open APIs for automation and integration.”