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 781
METROPCS, INC. 43
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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2021-09-23 781-889 0XXX1XXX2XXX3XXX8XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 MARSHFIELD MA
2017-08-24 781-299 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 LYNN MA
2002-10-30 781-901 none assigned yet which blocks → METROPCS, INC. 5562 WEYMOUTH MA
2002-10-28 781-540 0XXX2XXX3XXX4XXX5XXX6XXX7XXX which blocks → METROPCS, INC. 5562 NEEDHAM MA
2002-10-28 781-548 2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → METROPCS, INC. 5562 WAKEFIELD MA
2002-10-28 781-568 2XXX3XXX4XXX5XXX6XXX which blocks → METROPCS, INC. 5562 STONEHAM MA
2002-10-28 781-570 2XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → METROPCS, INC. 5562 WINCHESTER MA
2002-10-28 781-576 1XXX3XXX4XXX · 2 holders which blocks → METROPCS, INC. 5562 MARBLEHEAD MA
2002-10-28 781-591 0XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → METROPCS, INC. 5562 WELLESLEY MA
2002-10-25 781-201 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → METROPCS, INC. 5562 SHARON MA
2002-10-25 781-252 2XXX which blocks → METROPCS, INC. 5562 WHITMAN MA
2002-10-25 781-351 4XXX5XXX8XXX · 2 holders which blocks → METROPCS, INC. 5562 ROCKLAND MA
2002-10-25 781-414 3XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → METROPCS, INC. 5562 NORWOOD MA
2002-10-25 781-500 none assigned yet which blocks → METROPCS, INC. 5562 MARSHFIELD MA
2002-07-30 781-330 0XXX which blocks → METROPCS, INC. 5562 WALTHAM MA
2002-07-30 781-420 none assigned yet which blocks → METROPCS, INC. 5562 MALDEN MA
2002-07-30 781-913 none assigned yet which blocks → METROPCS, INC. 5562 LYNN MA
2001-05-04 781-706 2XXX3XXX4XXX which blocks → METROPCS, INC. 5562 HINGHAM MA
2001-05-03 781-603 0XXX1XXX2XXX3XXX4XXX · 3 holders which blocks → METROPCS, INC. 5562 NORWOOD MA
2001-05-03 781-727 2XXX3XXX4XXX8XXX which blocks → METROPCS, INC. 5562 NEEDHAM MA
2001-02-23 781-720 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 MELROSE MA
2001-02-22 781-504 0XXX2XXX7XXX · 3 holders which blocks → METROPCS, INC. 5562 WOBURN MA
2001-01-03 781-704 0XXX2XXX9XXX · 3 holders which blocks → METROPCS, INC. 5562 WOBURN MA
— 781-242 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → METROPCS, INC. 5562 HULL MA
— 781-243 3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → METROPCS, INC. 5562 HANOVER MA
— 781-291 3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → METROPCS, INC. 5562 DUXBURY MA
— 781-367 none assigned yet which blocks → METROPCS, INC. 5562 WOBURN MA
— 781-385 2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → METROPCS, INC. 5562 HINGHAM MA
— 781-389 none assigned yet which blocks → METROPCS, INC. 5562 WINCHESTER MA
— 781-405 none assigned yet which blocks → METROPCS, INC. 5562 WOBURN MA
— 781-552 3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → METROPCS, INC. 5562 BURLINGTON MA
— 781-580 2XXX3XXX8XXX · 2 holders which blocks → METROPCS, INC. 5562 LYNNFIELD MA
— 781-589 none assigned yet which blocks → METROPCS, INC. 5562 WINCHESTER MA
— 781-608 none assigned yet which blocks → METROPCS, INC. 5562 WOBURN MA
— 781-691 1XXX2XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 LYNN MA
— 781-696 none assigned yet which blocks → METROPCS, INC. 5562 WOBURN MA
— 781-760 none assigned yet which blocks → METROPCS, INC. 5562 WINCHESTER MA
— 781-844 none assigned yet which blocks → METROPCS, INC. 5562 ARLINGTON MA
— 781-858 none assigned yet which blocks → METROPCS, INC. 5562 REVERE MA
— 781-883 none assigned yet which blocks → METROPCS, INC. 5562 WOBURN MA
— 781-953 none assigned yet which blocks → METROPCS, INC. 5562 REVERE MA
— 781-962 2XXX which blocks → METROPCS, INC. 5562 WOBURN MA
— 781-983 8XXX which blocks → METROPCS, INC. 5562 WINCHESTER 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.