Appendix E: Names Registered During WINS Name Registration

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In the following table, presents commonly registered names by a Microsoft client computer:

Name Registered

Description

Computername <00>

Registered by the Workstation service of the client.

Computername <03>

Registered by the Messenger service. This allows the host to receive messages, such as net send computername.

Username <03>

Registered by the Messenger service. This allows the user to receive messages, such as net send username.

Computername

Registered by the Server service. It appear as computername <20>, depending on the utility used to view the names registered. This allows the host to receive connection requests from other hosts.

Workgroup or domainname <00>

Registered as a Group NetBIOS Name, as opposed to a Unique NetBIOS Name, as was the computername. This registers the computer as a member of the domain or workgroup.

Workgroup or domainname <1E>

Registered as a Group NetBIOS Name and is used for Browser Elections.

Domainname <1B>

Registers the local computer as the Domain Master Browser for the domain. This is registered as a Unique NetBIOS Name.

Domainname <1C>

Registers the local computer as a domain controller for the domain. This is registered as a Group NetBIOS Name.

Workgroup or domainname <1D>

Registers the local client as the local subnet's Master Browser for the workgroup or domain. This is registered as a Unique NetBIOS Name.

Registration Details

A name registration frame contains the following details:

  • Frame size of 110 bytes.

  • Directed frames at both the physical and IP layers.

  • UDP Port 137 (NetBIOS Name Service) is used for both the Source and Destination ports.

The final 68 bytes of the frame is the actual NetBIOS name registration request. It contains the following details:

  • A NBT Flag of Registration, identifying this as a registration packet.

  • Resource Record Name identifies the NetBIOS name to be registered.

  • A Resource Record Flag that identifies this as a unique (single IP address for the name) or group (multiple IP addresses/hosts) NetBIOS name.

  • Owner IP Address lists the IP address of the registering computer.

When the WINS server receives this request, it will respond with either a success or failure message, indicating whether or not the name was able to be registered.

The unique properties of a success message are:

  • Size of 104 bytes.

  • In the NBT portion of the frame, there are Flags to indicate this message as a Response, and as an "Authoritative Answer".

  • The Resource Record Name indicates the name was registered.

  • The Time To Live informs the client of the TTL of the name.