While the keyword may look like a random string of characters, it actually refers to a specific technical access point for the Brussels Intercommunal Transport Company (STIB-MIVB) . Specifically, it points toward a legacy or internal SAP NetWeaver Portal —indicated by the "irj/portal" path—used for managing large-scale transport operations and employee resources.
portail.stib-mivb.be resolves only inside STIB’s intranet. Use VPN or contact IT.