What Is the Node Port Range?
The node port range is the configured span of ports, by default a high band such as the thirty-thousands, from which the cluster assigns a port for each NodePort service. That port is opened on every node and forwards to the service. The range bounds how many such services can exist and which ports they may use.
Why it matters
Knowing the range explains why NodePort services use unusual high ports and how to allowlist them in firewalls. Exhausting the range blocks new NodePort services from being created.
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