This read-only Integer32 has no source description but its name indicates the translated (global) port number currently used by an active NAT session. An admin correlating an external log entry back to an internal host needs both this port and the paired global address, since with PAT many internal hosts can share one public IP distinguished only by port. For example, an admin might see this object report port 40213 for a session and use that exact address:port pair to match an entry in an upstream firewall's log.