517121 — Telecommunications Resellers
Description
This U.S. industry comprises establishments engaged in purchasing access and network capacity from owners and operators of telecommunications networks and reselling wired and wireless telecommunications services to businesses and households (except satellite telecommunications and agents for wireless telecommunications services). Establishments in this industry resell telecommunications; they do not operate transmission facilities and infrastructure.
Illustrative Examples
- Mobile virtual network operators (MVNOs) (except agents)
- Pre-paid calling cards, telecommunications resellers
- Wired telecommunications resellers
- Wireless telecommunications resellers (except satellite telecommunications and agents)
Overview Facts
| NAICS Code | 517121 |
|---|---|
| Industry Title | Telecommunications Resellers |
| SBA Size Standard | 1,500 employees |
| IRS PBA Code | 517000 (rolled-up match) |
| Sectors Hierarchy | Sector 51 → 517 → 5171 |
| Source / Verified | US Census 2022 NAICS Manual / 2026-06-28 |
Legacy SIC Concordance
Trace the historical mapping chain from the 1987 Standard Industrial Classification (SIC) to the modern 2022 NAICS code format.
- SIC 4812 - Radiotelephone Communications (via SIC1987:4812→NAICS1997:51333→2002:517310→2007:517911→2012:517911→2017:517911→2022:517121)
- SIC 4813 - Telephone Communications, Except Radiotelephone (via SIC1987:4813→NAICS1997:51333→2002:517310→2007:517911→2012:517911→2017:517911→2022:517121)
Related Resources & Compliance Guides
Further regulatory reference links for NAICS code 517121:
- Sector 51 Directory Hub — List of related industries in the Information sector.
- SIC ↔ NAICS Crosswalk Tool — Look up mappings between legacy SIC codes and modern classifications.
- SBA Size Standards Guide — Complete rules and averaging periods for small business classifications.
- Calculating Annual Receipts Guide — Detailed worked example of revenue calculation rules.
- IRS Principal Business Activity Guide — How NAICS codes map to corporate and entity tax filings.
Related Industries in 5171
Frequently Asked Questions (FAQ)
Is 517121 a valid 2022 NAICS code?
NAICS 517121 is 'Telecommunications Resellers', a 2022 U.S. national industry under Sector 51 (Information); the SBA small-business size standard is 1,500 employees.
What is the SBA size standard for NAICS 517121?
The SBA small business size standard for NAICS 517121 is 1,500 employees (based on employees).
What is the legacy SIC code mapping for 517121?
NAICS code 517121 maps to the legacy 1987 SIC codes: 4812 - Radiotelephone Communications, 4813 - Telephone Communications, Except Radiotelephone.