Port 9100 — JetDirect / node_exporter
Quick reference for TCP/UDP port 9100, used by JetDirect / node_exporter. Includes what the service does, security guidance and related ports.
What is port 9100?
HP printer port; Prometheus node_exporter.
What port does JetDirect / node_exporter use?
JetDirect / node_exporter listens on port 9100 by default.
Security guidance
High risk — do not expose to the internet
Port 9100 (JetDirect / node_exporter) is high-risk because the service it carries is a frequent target for credential attacks, brute force or unpatched-vulnerability scanning. Keep it bound to localhost or your VPN, never forward it directly on a router, and require strong authentication.
Related ports
Frequently asked
What is port 9100 used for?+
Port 9100 is the standard TCP/UDP port for JetDirect / node_exporter. HP printer port; Prometheus node_exporter.
What port does JetDirect / node_exporter use?+
JetDirect / node_exporter listens on port 9100 by default.
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