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1.9 Standards Assignments

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The SMB2 protocol supports Direct TCP Transport and makes use of the following assignments, as specified in section 2.1.

Parameter

TCP port value

Reference

Microsoft-DS

445 (0x01BD)

[IANAPORT]

When the SMB 3.x dialect family is negotiated and an RDMA transport is used, the standards assignment for the protocol specified in [MS-SMBD] is used.

When the SMB 3.1.1 dialect is negotiated, the SMB2 protocol supports QUIC over UDP port 443. The ALPN Identification sequence used to identify the SMB2 protocol over QUIC is 0x73 0x6D 0x62 ("smb").

This protocol shares the standards assignments of NetBIOS-over-TCP port, as specified in [RFC1001] and [RFC1002].