NMAP for open ports on RT-ACHR13

Now that we have migrated to high speed internet with an Arris cable modem thought I would use the new NMAP to check one of the two ASUS routers that are cabled to the Arris from the inside. This one is my ASUS AC1300 (RT-ACHR13) running 3.0.0.4.380.8457 current firmware - it's used for an occasional guest, cameras, Raspberry PIs, etc.

This is the results (only TCP ports were open with a comprehensive scan) with port number and service:
53 - domain
80 - http
515 - printer
9100 - jetdirect...

NMAP for open ports on RT-ACHR13