List running ports in container without ss/netstat
cat /proc/net/tcp | awk '{print $2}' | grep -vi 'local' | awk -F: '{gsub(/../,"0x& ", $1)} {l=split($1,hip," "); for(i=l;i>0;i--) printf "%d%s", hip[i], (i == 1 ? ":" : "."); printf "%d%s","0x"$2, ORS}'