Port 111 — RPCbind / portmapper
Quick reference for TCP/UDP port 111, used by RPCbind / portmapper. Includes what the service does, security guidance and related ports.
What is port 111?
Sun ONC RPC service mapper.
What port does RPCbind / portmapper use?
RPCbind / portmapper listens on port 111 by default.
Security guidance
High risk — do not expose to the internet
Port 111 (RPCbind / portmapper) 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 111 used for?+
Port 111 is the standard TCP/UDP port for RPCbind / portmapper. Sun ONC RPC service mapper.
What port does RPCbind / portmapper use?+
RPCbind / portmapper listens on port 111 by default.
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