---
kind: "unit"
title: "47"
title_heading: "Telecommunication"
key: "chI/subchB/part52"
level: "part"
label: "Part 52"
heading: "Numbering"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/47/chI-subchB-part52"
sections_count: 35
---

# Part 52 — Numbering

Title 47 C.F.R. — Telecommunication › Chapter I — Federal Communications Commission › Subchapter B — Common Carrier Services

## Contents

- [Subpart A — Scope and Authority](/cfr/47/chI-subchB-part52-subpartA.md)
- [Subpart B — Administration](/cfr/47/chI-subchB-part52-subpartB.md)
- [Subpart C — Number Portability](/cfr/47/chI-subchB-part52-subpartC.md)
- [Subpart D — Toll Free Numbers](/cfr/47/chI-subchB-part52-subpartD.md)
- [Subpart E — Universal Dialing Code for National Suicide Prevention and Mental Health Crisis Hotline System](/cfr/47/chI-subchB-part52-subpartE.md)