NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, all time — NPA 617
METROPCS, INC. 26
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2011-10-19 617-637 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 JAMAICA PL MA
2007-03-30 617-756 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 BOSTON MA
2002-10-25 617-980 none assigned yet which blocks → METROPCS, INC. 5562 MILTON MA
2002-07-31 617-458 5XXX7XXX8XXX · 2 holders which blocks → METROPCS, INC. 5562 WATERTOWN MA
2002-05-08 617-304 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
2001-03-09 617-767 0XXX7XXX8XXX · 2 holders which blocks → METROPCS, INC. 5562 SOMERVILLE MA
2001-03-09 617-869 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
2001-02-14 617-270 2XXX9XXX which blocks → METROPCS, INC. 5562 CHELSEA MA
2001-02-14 617-271 2XXX7XXX8XXX · 3 holders which blocks → METROPCS, INC. 5562 EASTBOSTON MA
— 617-293 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
— 617-438 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
— 617-461 none assigned yet which blocks → METROPCS, INC. 5562 CHELSEA MA
— 617-501 none assigned yet which blocks → METROPCS, INC. 5562 SOMERVILLE MA
— 617-504 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
— 617-590 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
— 617-592 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
— 617-593 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
— 617-594 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
— 617-596 none assigned yet which blocks → METROPCS, INC. 5562 SO BOSTON MA
— 617-719 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
— 617-799 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
— 617-828 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
— 617-839 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
— 617-905 none assigned yet which blocks → METROPCS, INC. 5562 DORCHESTER MA
— 617-908 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
— 617-970 none assigned yet which blocks → METROPCS, INC. 5562 EASTBOSTON MA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.