NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 440
T-MOBILE USA, INC. 62
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
2025-08-12 440-982 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 ASHTABULA OH
2024-08-27 440-404 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ASHTABULA OH
2023-08-30 440-518 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 AVON LAKE OH
2023-08-04 440-470 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ASHTABULA OH
2022-02-14 440-841 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ASHTABULA OH
2021-04-13 440-694 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ASHTABULA OH
2021-01-19 440-687 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ELYRIA OH
2020-09-10 440-674 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ELYRIA OH
2017-04-10 440-898 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → T-MOBILE USA, INC. 6529 PAINESVL OH
2016-05-25 440-904 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 E CLARIDON OH
2015-10-07 440-661 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ASHTABULA OH
2015-08-25 440-850 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ASHTABULA OH
2015-06-11 440-412 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 ELYRIA OH
2015-04-03 440-472 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BEREA OH
2014-10-13 440-650 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 ASHTABULA OH
2014-09-12 440-657 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 ELYRIA OH
2014-08-22 440-485 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 CHAGRINFLS OH
2014-02-04 440-732 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 STRONGSVL OH
2014-02-03 440-351 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BEREA OH
2013-10-07 440-469 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BEREA OH
2013-06-14 440-830 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 LORAIN OH
2011-07-28 440-222 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LORAIN OH
2009-10-07 440-381 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ASHTABULA OH
2009-09-22 440-723 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ELYRIA OH
2007-11-07 440-654 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LORAIN OH
2007-03-15 440-787 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LORAIN OH
2002-07-11 440-278 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 WICKLIFFE OH
2002-07-11 440-318 0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHAGRINFLS OH
2002-07-11 440-390 1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 NOROYALTON OH
2002-07-11 440-454 4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 OLMSTEDFLS OH
2002-07-11 440-532 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 BEREA OH
2002-07-11 440-533 1XXX3XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 GATESMILLS OH
2002-04-22 440-212 5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 STRONGSVL OH
2002-04-22 440-360 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 TRINITY OH
2002-04-22 440-681 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 HILLCREST OH
2002-04-22 440-749 3XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 WILLOUGHBY OH
2002-04-22 440-832 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 BRECKSVL OH
2002-04-08 440-320 3XXX4XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 LORAIN OH
2002-04-08 440-739 1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 NEWBURY OH
2002-04-08 440-983 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MADISON OH
2002-03-20 440-231 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PAINESVL OH
2002-03-20 440-313 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 E CLARIDON OH
2002-03-20 440-317 2XXX3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 BEDFORD OH
2002-03-20 440-319 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 ASHTABULA OH
2002-03-20 440-506 3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 ELYRIA OH
2001-02-06 440-622 0XXX1XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PAINESVL OH
2001-02-06 440-623 0XXX1XXX2XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 BEREA OH
— 440-228 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 ASHTABULA OH
— 440-258 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LORAIN OH
— 440-263 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BEREA OH

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.