> or if you prefer less typing "ss -lnp | grep -w 53".

Rather than doing external filtering, you can also use the ipfilter
baked-in syntax:
ss -lnp 'sport = :53'
(listening, hence "source port" notion is reversed)
(you could also append -t or -u options to filter repectively on TCP or
UDP if that was wished)

Bernard (Beer) Rosset
https://rosset.net/