Classification Research Tools Center | Industry, Product, Occupational Codes & Conversions
Classification Research Tools
Discover and compare the world’s leading industry, product, and occupational classification systems in one place. This hub provides direct access to every major code system SICCODE.com specializes in, including NAICS, SIC, ISIC, NACE, HS, SOC, and more.
Use this page to explore definitions, code structures, and practical applications for market research, compliance, data enrichment, reporting, and conversion between systems.
Simple way to use this page: start with the type of code you need — industry, product, occupational, or identifier — then use the conversion section if you need to translate between systems.
Industry Codes
Industry Codes – Global & U.S.
Core industry taxonomies used for market research, segmentation, compliance mapping, and data enrichment.
Current U.S./North America 2- to 6-digit industry structure for economic analysis.
Legacy U.S. 4-digit system widely used for historical benchmarking and classification.
Finer NAICS granularity for precise targeting and internal analytics.
Granular SIC extensions for deeper segmentation beyond the standard 4-digit structure.
United Nations global industry taxonomy for international comparability.
EU industry classification aligned with ISIC; useful for European reporting.
United Kingdom industry codes for domestic filings, statistics, and analytics.
Australia & New Zealand industry codes for regional analysis.
NAICS in French for Canada’s francophone users and documentation.
NAICS in Spanish for Mexico and Spanish-language references.
Overview of how structured taxonomies organize economic activities.
Product Codes
Commodity and product systems used for trade, tariffs, product-level analytics, and reporting alignment.
North American Product Classification for services and goods.
Global tariff nomenclature used in customs and international trade.
UN product classification aligned with ISIC industries.
EU tariff schedule built on HS for EU trade statistics.
EU Statistical Classification of Products by Activity.
Specialized Business Codes
Company Identifiers & Standards
Identifiers and classification standards used in procurement, credit, capital markets, and data governance.
U.S. government supplier identifier for federal procurement.
Dun & Bradstreet business identifier used in credit and onboarding.
Global Industry Classification Standard for public equities.
How SICCODE verifies, structures, and maintains business datasets.
Overview of workflows, lookups, conversions, and research tooling.
Occupational & Educational Codes
Standardized occupation and program taxonomies for HR, training, analytics, workforce planning, and education alignment.
U.S. Standard Occupational Classification for jobs and roles.
U.S. Classification of Instructional Programs for education fields.
When to use this section
Use occupational and educational codes when the question is about people, jobs, skills, or programs rather than companies, products, or industries.
Code Conversions & Comparisons
These tools help translate between legacy and modern taxonomies. They are most useful when you need to map one classification system to another for reporting, analytics, or internal data alignment.
Convert NAICS codes to comparable SIC categories.
Map legacy SIC industries to modern NAICS equivalents.
Map NAICS industries to international ISIC structures.
Translate UN ISIC industries into NAICS for North America.
See the key differences, use cases, and mapping guidance between the two systems.
Important note on conversions
Crosswalks are useful starting points, but they are not always one-to-one translations. Final selection should still be checked against the underlying code definitions and the real activity being classified.