OID value: 1.3.6.1.2.1.6.13.1.3
OID description:
tcpConnLocalPort OBJECT-TYPE SYNTAX INTEGER (0..65535) ACCESS read-only STATUS mandatory DESCRIPTION "The local port number for this TCP connection." ::= { tcpConnEntry 3 }
See also the OID Repository website reference for 1.3.6.1.2.1.6.13.1.3