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National Codification Bureau (NCB)

Countries that participate in the National codification System (NCS) follow common standards and techniques to assign NSNs to items of supply in their defense inventory. The National Codification Bureau (NCB) within each country centrally assigns their national NSNs. The assignment of an NSN fixes the identity of each distinctive item of supply. All NSNs are uniform in composition, length, and structure. Each is represented by a 13-digit number, which can be divided into 3 unique parts:

The first four digits are the NATO Supply Classification (NSC) code, which relates the item to the group and class of similar items. The next two digits indicate the assigning NCB code (each country has its own two-digit NCB code - the United States uses "00" and "01") the final seven digits are assigned sequentially and have no inherent significance. However, this number relates to one and only one item of supply within the codifying country.

A National NSN is 11 digits long, virtually the same number minus the two-digit NCB code.

Probably more then you wanted to know about the NSN.

00-09=United States
12=Germany
13=Belgium
14=France
15=Italy
16=Czech Republic
17=Netherlands
18=South Africa
19=Brazil
20=Canada
21=Canada
22=Denmark
23=Greece
24=Iceland
25=Norway
26=Portugal
27=Turkey
28=Luxembourg
29=Argentina
30=Japan
31=Israel
32=Singapore
33=Spain
34=Malaysia
35=Thailand
36=Egypt
37=Korea, Republic of
38=Estonia
39=Romania
40=Slovakia
41=Austria
42=Slovenia
43=Poland
44=United Nations
45=Indonesia
46=Philippines
47=Lithuania
48=Fiji
49=Tonga
50=Bulgaria
51=Hungary
52=Chile
53=Croatia
54=Macedonia, The Former Yugoslav Rep. of
55=Latvia
56=Oman
66=Australia
70=Saudi Arabia
71=United Arab Emirates
98=New Zealand
99=United Kingdom