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Why Ping Works Without Any Port Number

Ping works, but which port does it even use? I can't find it.

Lesson notes

Takeaway: Ping is ICMP over IP: echo request out, echo reply back, no ports.

Quick check: Which protocol carries ping's echo request and reply messages?
  1. UDP on port 7
  2. ICMP directly over IP
  3. TCP on port 80

Ping uses ICMP Echo Request and Echo Reply, carried straight inside IP packets.

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