47 CFR § 18.303 - Prohibited frequency bands.

---
identifier: "/us/cfr/t47/s18.303"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "47 CFR § 18.303 - Prohibited frequency bands."
title_number: 47
title_name: "Telecommunication"
section_number: "18.303"
section_name: "Prohibited frequency bands."
chapter_name: "FEDERAL COMMUNICATIONS COMMISSION"
subchapter_number: "A"
subchapter_name: "GENERAL"
part_number: "18"
part_name: "INDUSTRIAL, SCIENTIFIC, AND MEDICAL EQUIPMENT"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "47 U.S.C. 154, 301, 302, 303, 304, 307."
regulatory_source: "50 FR 36067, Sept. 5, 1985, unless otherwise noted."
cfr_part: "18"
---


# 18.303 Prohibited frequency bands.

Operation of ISM equipment within the following safety, search and rescue frequency bands is prohibited: 490-510 kHz, 2170-2194 kHz, 8354-8374 kHz, 121.4-121.6 MHz, 156.7-156.9 MHz, and 242.8-243.2 MHz.