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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
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Title 47
Chapter I
Part 52 - PART 52—NUMBERING
Subpart A [§ 52.1 - § 52.5] - Subpart A—Scope and Authority
Subpart B [§ 52.7 - § 52.19] - Subpart B—Administration
Subpart C [§ 52.20 - § 52.99] - Subpart C—Number Portability
Subpart D [§ 52.101 - § 52.111] - Subpart D—Toll Free Numbers
Subpart E [§ 52.200 - § 52.202] - Subpart E—Universal Dialing Code for National Suicide Prevention and Mental Health Crisis Hotline System
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