NetBIOS Service codes in the NetBIOS suffix


NetBIOS resources are referenced by name. Lower-level address information is not
available to NetBIOS applications. An application registers one or more names
that it wishes to use. The NetBIOS name space is flat and uses sixteen
alphanumeric characters. Only 15 characters are available as the last letter is
reserved for service type:
















































































Name Number(h) Type Usage
<computername>
00
U
Workstation Service
<computername>
01
U
Messenger Service
<\\–__MSBROWSE__>
01
G
Master Browser
<computername>
03
U
Messenger Service
<computername>
06
U
RAS Server Service
<computername>
1F
U
NetDDE Service
<computername>
20
U
File Server Service
<computername>
21
U
RAS Client Service
<computername>
22
U
Microsoft Exchange Interchange(MSMail Connector)
<computername>
23
U
Microsoft Exchange Store
<computername>
24
U
Microsoft Exchange Directory
<computername>
30
U
Modem Sharing Server Service
<computername>
31
U
Modem Sharing Client Service
<computername>
43
U
SMS Clients Remote Control
<computername>
44
U
SMS Administrators Remote Control Tool
<computername>
45
U
SMS Clients Remote Chat
<computername>
46
U
SMS Clients Remote Transfer
<computername>
4C
U
DEC Pathworks TCPIP service on Windows NT
<computername>
42
U
mccaffee anti-virus
<computername>
52
U
DEC Pathworks TCPIP service on Windows NT
<computername>
87
U
Microsoft Exchange MTA
<computername>
6A
U
Microsoft Exchange IMC
<computername>
BE
U
Network Monitor Agent
<computername>
BF
U
Network Monitor Application
<username>
03
U
Messenger Service
<domain>
00
G
Domain Name
<domain>
1B
U
Domain Master Browser
<domain>
1C
G
Domain Controllers
<domain>
1D
U
Master Browser
<domain>
1E
G
Browser Service Elections
<INet~Services>
1C
G
IIS
<IS~computer name>
00
U
IIS
<computername>
[2B]
U
Lotus Notes Server Service
IRISMULTICAST
[2F]
G
Lotus Notes
IRISNAMESERVER
[33]
G
Lotus Notes
Forte_$ND800ZA
[20]
U
DCA IrmaLan Gateway Server Service

The NetBIOS name types describes the functionality:

U : unique – the name may have only one IP address
assigned to it. On a network device multiple occurrences of a single name may
appear to be registered. The suffix may be the only unique character in the
name.

G : group – a normal group; the single name may exist
with many IP addresses. WINS responds to a name query on a group name with the
limited broadcast address (255.255.255.255). Because routers block the
transmission of these addresses, the Internet Group was designed to service
communications between subnets.

M : multihomed – the name is unique, but due to
multiple network interfaces on the same computer this configuration is necessary
to permit the registration. The maximum number of addresses is 25.

M : Internet group – a special configuration of the
group name used to manage Windows NT Domain names.

D : domain name – new in Windows NT 4.0.

Taken from NetBIOS Suffixes Q163409. Check the original source for
updates. Related articles:

RFC1001 – Protocol Standard for a NetBIOS service on a TCP/UDP
transport

Q119493 – NetBIOS over TCP/IP Name Resolution and WINS

Q119495 – List of Names Registered with WINS Service

Q154609 – NETBIOS Node Status Query Returns First Instance of
Unique Name

Q129603 – Using Systems Management Server Remote Control over a
RAS Server

Rhino9 – NetBIOS Shares in depth.

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