Assignment of NPA 538 for Non-Geographic Services
Primary documents
| Letter | Published | Subject |
|---|---|---|
| PL-631 | 2025-07-02 | Assignment of NPA 538 for Non-Geographic Services |
All documents are official NANPA planning letters (Tier A sources). This page consolidates every letter we have on record for this event; it is updated automatically when new letters are detected, with sensitive changes held for editorial review first.