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This is a list of TCP and UDP port numbers used by protocols for operation of network applications. The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) only need one port for bidirectional traffic. TCP usually uses port numbers that match the services of the corresponding UDP implementations, if they exist, and vice versa.
Sessions are established by exchanging packets. The computer establishing the session attempts to make a TCP connection to port 139 on the computer with which the session is to be established. If the connection is made, the computer establishing the session then sends over the connection a "Session Request" packet with the NetBIOS names of the ...
135 Mobility Header Mobility Extension Header for IPv6 RFC 6275: 0x88 136 UDPLite Lightweight User Datagram Protocol: RFC 3828: 0x89 137 MPLS-in-IP Multiprotocol Label Switching Encapsulated in IP RFC 4023, RFC 5332: 0x8A 138 manet MANET Protocols RFC 5498: 0x8B 139 HIP Host Identity Protocol: RFC 5201: 0x8C 140 Shim6 Site Multihoming by IPv6 ...
July 17, 2003: CERT/CC releases a warning and suggests blocking port 135. [14] July 21, 2003: CERT/CC suggests also blocking ports 139 and 445. [14] July 25, 2003: xFocus releases information on how to exploit the RPC bug that Microsoft released the July 16 patch to fix. [15]
[citation needed] In NBT, the name service operates on UDP port 137 (TCP port 137 can also be used, but rarely is). The name service primitives offered by NetBIOS are: Add name – registers a NetBIOS name. Add group name – registers a NetBIOS "group" name. Delete name – un-registers a NetBIOS name or group name.
Port numbers are categorized into three basic categories: well-known, registered, and dynamic or private. The well-known ports are assigned by the Internet Assigned Numbers Authority (IANA) and are typically used by system-level processes. Well-known applications running as servers and passively listening for connections typically use these ports.
In computer networking, a port or port number is a number assigned to uniquely identify a connection endpoint and to direct data to a specific service. At the software level, within an operating system, a port is a logical construct that identifies a specific process or a type of network service.
An ephemeral port is a communications endpoint of a transport layer protocol of the Internet protocol suite that is used for only a short period of time for the duration of a communication session. Such short-lived ports are allocated automatically within a predefined range of port numbers by the IP stack software of a computer operating system.