Which port does ping uses?

The answer is none.

No ports required for Ping as it uses icmp packets.

It needs to allow icmp 'echo-request' (type 8) packets out and icmp 'echo-reply' (type 0) packets in.

If you need to check the availability of a port, you must use a different tool, such as Paping.
It doesnt use any port. Echo request is an ICMP message which is an internet Layer Protocol so it is sent as an IP datagram.

If you need to check the availability of a port, you must use a different tool, such as Paping.