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
OHIO BELL TEL CO 124
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 115
LEVEL 3 COMMUNICATIONS, LLC - OH 68
T-MOBILE USA, INC. 62
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 52
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
2017-04-10 440-898 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → T-MOBILE USA, INC. 6529 PAINESVL OH
2017-03-10 440-583 0–9 XXXall 10 · 6 holders which blocks → XO OHIO, INC. 7520 BEDFORD OH
2017-03-07 440-722 0–9 XXXall 10 · 3 holders which blocks → TELNYX LLC 073H BRECKSVL OH
2017-03-07 440-929 0–9 XXXall 10 · 3 holders which blocks → TELNYX LLC 073H BEREA OH
2017-02-21 440-558 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 VICTORY OH
2017-02-06 440-529 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ELYRIA OH
2016-12-14 440-872 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 TRINITY OH
2016-10-28 440-870 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - OH 464C STRONGSVL OH
2016-09-30 440-538 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 LORAIN OH
2016-07-21 440-907 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 VICTORY OH
2016-07-12 440-901 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - OH 464C CHARDON OH
2016-05-25 440-904 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 E CLARIDON OH
2016-05-09 440-671 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - OH 464C BRECKSVL OH
2016-04-25 440-857 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 CLEVELAND OH
2016-03-01 440-496 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - OH 464C OLMSTEDFLS OH
2016-03-01 440-970 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → ONVOY, LLC - OH 464C BURTON OH
2016-02-16 440-493 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - OH 464C VICTORY OH
2016-02-12 440-771 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - OH 464C HILLCREST OH
2016-02-01 440-797 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - OH 464C BEDFORD 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
2015-08-05 440-903 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHAGRINFLS OH
2015-07-31 440-737 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J TRUMBULL OH
2015-07-31 440-837 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J DORSET OH
2015-07-28 440-769 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F CHAGRINFLS OH
2015-06-12 440-817 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F BRECKSVL OH
2015-06-11 440-412 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 ELYRIA OH
2015-05-22 440-662 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 ELYRIA OH
2015-05-12 440-502 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 VICTORY OH
2015-05-06 440-754 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F PAINESVL OH
2015-04-28 440-276 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F KIRTLAND OH
2015-04-28 440-644 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F CHESTERLD OH
2015-04-27 440-772 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F TRINITY OH
2015-04-03 440-472 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BEREA OH
2015-03-25 440-999 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - OH 464C CHAGRINFLS OH
2015-03-23 440-462 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F CLEVELAND 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
2014-08-19 440-482 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F VICTORY OH
2014-08-04 440-468 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BAINBRIDGE OH
2014-07-08 440-459 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 HILLCREST OH
2014-06-19 440-416 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CHAGRINFLS OH
2014-06-19 440-418 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BEREA OH
2014-06-19 440-441 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CHAGRINFLS OH
2014-06-19 440-450 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BEREA OH
2014-05-21 440-464 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BRECKSVL OH
2014-05-20 440-451 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 HILLCREST OH
2014-05-20 440-495 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 VICTORY OH
2014-04-30 440-467 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F 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.