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 443
METROPCS, INC. 25
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
2010-12-13 443-993 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 ELKTON MD
2010-07-13 443-821 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 WESTMINSTR MD
2004-10-04 443-282 0–9 XXXall 10 · 7 holders which blocks → METROPCS, INC. 5562 CHESTERTN MD
2004-01-20 443-225 0–9 XXXall 10 · 8 holders which blocks → METROPCS, INC. 5562 CAMBRIDGE MD
2002-07-02 443-744 8XXX which blocks → METROPCS, INC. 5562 REISTERSTN MD
2001-12-19 443-864 2XXX3XXX4XXX5XXX · 2 holders which blocks → METROPCS, INC. 5562 COLUMBIA MD
2001-04-20 443-694 0XXX2XXX8XXX which blocks → METROPCS, INC. 5562 SEVERNA PK MD
2001-04-17 443-366 2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → METROPCS, INC. 5562 SALISBURY MD
2001-03-15 443-398 2XXX3XXX8XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 SYKESVILLE MD
— 443-277 none assigned yet which blocks → METROPCS, INC. 5562 SYKESVILLE MD
— 443-306 2XXX which blocks → METROPCS, INC. 5562 SEVERNA PK MD
— 443-309 none assigned yet which blocks → METROPCS, INC. 5562 ELKTON MD
— 443-335 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 BRYNPKLNCM MD
— 443-373 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → METROPCS, INC. 5562 OCEAN CITY MD
— 443-375 3XXX4XXX5XXX · 3 holders which blocks → METROPCS, INC. 5562 HAMPSTEAD MD
— 443-404 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → METROPCS, INC. 5562 SOLOMONS MD
— 443-466 2XXX which blocks → METROPCS, INC. 5562 ELKTON MD
— 443-496 3XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → METROPCS, INC. 5562 EASTON MD
— 443-497 5XXX7XXX8XXX9XXX · 2 holders which blocks → METROPCS, INC. 5562 SALISBURY MD
— 443-532 2XXX3XXX9XXX · 3 holders which blocks → METROPCS, INC. 5562 PRINCEFRCK MD
— 443-536 0XXX2XXX4XXX7XXX8XXX · 2 holders which blocks → METROPCS, INC. 5562 WESTMINSTR MD
— 443-597 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 SEVERNA PK MD
— 443-599 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 SEVERN MD
— 443-807 2XXX4XXX5XXX · 3 holders which blocks → METROPCS, INC. 5562 FALLSTON MD
— 443-881 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 REISTERSTN MD

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.