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Q194203: ASCII and Hex Representation of NetBIOS Names |
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Article: Q194203
Product(s): Windows for Workgroups and Windows NT Networking Issues
Version(s): Windows:95,98;WinNT:4.0
Operating System(s):
Keyword(s):
Last Modified: 10-AUG-2001
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The information in this article applies to:
- Microsoft Windows NT Server version 4.0
- Microsoft Windows NT Workstation version 4.0
- Microsoft Windows 98
- Microsoft Windows 95
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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.
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.
REFERENCES
==========
For more information, see RFC 1001.
Additional query words: kbDSupport NetBIOS Name Character Encoded Hex ASCII
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Keywords :
Technology : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400 kbWin95search kbWin98search kbZNotKeyword3 kbWin98
Version : Windows:95,98;WinNT:4.0
Issue type : kbinfo
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