ASCII and Hex Representation of NetBIOS Names
Description: NetBIOS names are 16 bytes long, but they are mapped to a 32-byte wide string of alphabet (A,B...O,P) using a reversible, half-ASCII, biased encoding. The algorithm used to encode NetBIOS names is as follows: Each half-octet of the NetBIOS name is...
Keywords: kbinfo KB194203

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Article ID: 194203 - Last Review: January 23, 2007 - Revision: 2.2 # ASCII and Hex Representation of NetBIOS Names View products that this article applies to. This article was previously published under Q194203 Expand all | Collapse all ## SUMMARY NetBIOS names are 16 bytes long, but they are mapped to a 32-byte wide string of alphabet (A,B...O,P) using a reversible, half-ASCII, biased encoding. Back to the top ## MORE INFORMATION The algorithm used to encode NetBIOS names is as follows: Each half-octet of the NetBIOS name is encoded into 1 byte of the 32-byte field. The first half-octet is encoded into the first byte, the second half- octet into the second byte, and so on. Each 4-bit, half-octet of the NetBIOS name is treated as an 8-bit, right-adjusted, zero-filled binary number. This number is added to the value of the ASCII character 'A' (hexadecimal 41). The resulting 8-bit number is stored in the appropriate byte. This encoding results in a NetBIOS name being represented as a sequence of 32 ASCII, upper-case characters from the set {A,B,C...N,O,P}. The NetBIOS scope identifier is a valid domain name (without a leading dot). An ASCII dot (2E hexadecimal) and the scope identifier are appended to the encoded form of the NetBIOS name, the result forming a valid domain name. For example, the NetBIOS name "THE NETBIOS NAME" in the NetBIOS scope "SCOPE.ID.COM" would be represented at level one by the ASCII character string:
       FEEIEFCAEOEFFEECEJEPFDCAEOEBENEF.SCOPE.ID.COM
The following is a list of characters and their corresponding encoded ASCII and hex values:
       Character   ASCII Code    Hex Code
       ----------------------------------

       A            EB            45 42
       B            EC            45 43
       C            ED            45 44
       D            EE            45 45
       E            EF            45 46
       F            EG            45 47
       G            EH            45 48
       H            EI            45 49
       I            EJ            45 4A
       J            EK            45 4B
       K            EL            45 4C
       L            EM            45 4D
       M            EN            45 4E
       N            EO            45 4F
       O            EP            45 50
       P            FA            46 41
       Q            FB            46 42
       R            FC            46 43
       S            FD            46 44
       T            FE            46 45
       U            FF            46 46
       V            FG            46 47
       W            FH            46 48
       X            FI            46 49
       Y            FJ            46 4A
       Z            FK            46 4B

       0            DA            44 41
       1            DB            44 42
       2            DC            44 43
       3            DD            44 44
       4            DE            44 45
       5            DF            44 46
       6            DG            44 47
       7            DH            44 48
       8            DI            44 49
       9            DJ            44 4A

       <space>      CA            43 41
       !            CB            43 42
       "            CC            43 43
       #            CD            43 44
       $            CE            43 45
       %            CF            43 46
       &            CG            43 47
       '            CH            43 48
       (            CI            43 49
       )            CJ            43 4A
       *            CK            43 4B
       +            CL            43 4C
       ,(comma)     CM            43 4D
       -(hyphen)    CN            43 4E
       .(period)    CO            43 4F
       =            DN            44 4E
       :(colon)     DK            44 4B
       ;(semicolon) DL            44 4C
       @            EA            45 41
       ^            FO            46 4F
       _(underscore)FP            46 50
       {            HL            48 4C
       }            HN            48 4E
       ~            HO            48 4F
NOTE: The above mapping list can be useful while reading network traces because information is sent on the wire in the above encoded format. Back to the top ## REFERENCES For more information, see RFC 1001. Back to the top ##### APPLIES TO Microsoft Windows NT Server 4.0 Standard Edition Microsoft Windows NT Workstation 4.0 Developer Edition Microsoft Windows 98 Standard Edition Microsoft Windows 95 Back to the top
##### Keywords: | kbinfo KB194203
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