Port 111 (ONC RPC / portmapper) – TCP/UDP

TCP Yes

UDP Yes

SCTP —

DCCP —

What it is

Sun RPC portmapper/rpcbind — maps RPC program numbers to ports.

Required by NFS and related services on Unix. A common attack surface; restrict it.

Transport	Status	Meaning
TCP	Yes	Assigned by IANA and standardized, specified, or widely used on this port.
UDP	Yes	Assigned by IANA and standardized, specified, or widely used on this port.
SCTP	—	Not applicable for this transport.
DCCP	—	Not applicable for this transport.

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Well-known (0–1023). System port for a core service. On Unix-like systems, binding it requires superuser privileges.

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