Data Sources & Licenses
Every lookup on CodeClassify is answered from an official public dataset. This page lists each one: where it comes from, which edition we use, and why we are allowed to republish it.
The datasets
| Dataset | Official source | Edition we use | Powers |
|---|---|---|---|
| NAICS structure & official industry definitions (2,125 codes) | U.S. Census Bureau | 2022 NAICS | The NAICS reference pages, the NAICS & SIC lookup and the API |
| SIC codes and titles (1,005 codes) | 1987 U.S. Standard Industrial Classification (as published by U.S. federal agencies and still used by the SEC on EDGAR) | 1987 SIC | The SIC reference pages and lookup tools |
| SIC ↔ NAICS concordance (2,163 mappings) | U.S. Census Bureau concordance files | 1987 SIC ↔ 2002 NAICS, resolved forward to 2022 codes | The SIC ↔ NAICS crosswalk and the "related codes" tables on reference pages |
| Small-business size standards (978 industries) | U.S. Small Business Administration, codified at 13 CFR 121.201 | Current SBA table | The "Is a business under this code small?" sections on NAICS pages |
| Harmonized System headings & subheadings (6,840 entries) | U.S. International Trade Commission — Harmonized Tariff Schedule | Current HTS edition, 4- and 6-digit international levels | The HS code lookup and the API |
| IBAN country formats (length and structure per country) | ISO 13616 country formats as publicly documented | Current registry facts | The IBAN checker |
Why we may republish this data
The NAICS structure, the SIC list, the Census concordance, the SBA size-standard table and the USITC Harmonized Tariff Schedule are works of the United States federal government. Under 17 U.S.C. § 105 they are in the public domain and may be reproduced, including on a commercial, ad-supported site like this one. We attribute HS data to the USITC's tariff schedule, which is the U.S. legal enactment of the international system.
Validation algorithms (Mod-10, Luhn, MOD 97-10, ISO 6346, the VIN check digit) are mathematical procedures: facts and algorithms are not copyrightable, and our pages describe them in our own words. See how our validators work for the full list. CodeClassify is not affiliated with, or endorsed by, GS1, the U.S. government, the European Union, ISO or any standards body; their names are used only to identify the standards themselves.
Editions and updates
Classification systems change on official schedules: NAICS is revised every five years (the 2027 revision will be adopted here after the Census Bureau publishes final tables), the SBA updates size standards through rulemaking, and the USITC revises the tariff schedule several times a year. When a dataset is refreshed, the change is recorded in the changelog. The SIC system has been frozen since 1987 — that is precisely why the crosswalk to NAICS exists.
Accuracy and limits
We reproduce official data faithfully and re-verify against the source when discrepancies are reported, but this site is an informational reference, not a legal authority. For filings where the code choice has legal or financial consequences (government registrations, customs declarations, SBA certification), always confirm against the official source linked above. Found an error? Contact us — corrections are handled under our editorial policy.
Related
How our validators work — the algorithms behind every tool. Editorial & accuracy policy — how we write, review and correct. About & contact.