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 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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2026-01-14 440-924 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 HILLCREST OH
2025-12-29 440-900 0XXX1XXX9XXX · 2 holders which blocks → ONVOY, LLC - OH 464C AMHERST OH
2025-11-12 440-200 0XXX which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F PARKMAN OH
2025-11-03 440-912 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DORSET OH
2025-09-04 440-921 0XXX1XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LORAIN OH
2025-08-12 440-982 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 ASHTABULA OH
2025-03-31 440-920 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WILLOUGHBY OH
2024-10-07 440-369 0–9 XXXwhole prefix which blocks → EON TELECOM, INC. 839J BURTON OH
2024-10-07 440-906 0–9 XXXwhole prefix which blocks → EON TELECOM, INC. 839J CLEVELAND OH
2024-10-07 440-908 0–9 XXXwhole prefix which blocks → EON TELECOM, INC. 839J CHARDON OH
2024-08-27 440-404 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ASHTABULA OH
2024-08-16 440-440 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - OH 464C HILLCREST OH
2024-07-05 440-905 1XXX which blocks → FIRST COMMUNICATIONS, LLC 460K BEREA OH
2024-05-15 440-896 0XXX1XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ELYRIA OH
2024-03-07 440-883 0XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 E CLARIDON OH
2024-03-05 440-621 0XXX1XXX8XXX9XXX · 4 holders which blocks → CSC VOICE, LLC 612K BAINBRIDGE OH
2024-03-05 440-875 0–9 XXXall 10 · 3 holders which blocks → COMMIO, LLC 939H VICTORY OH
2024-02-08 440-393 1XXX which blocks → IP HORIZON LLC 515J KIRTLAND OH
2024-02-08 440-861 1XXX7XXX · 2 holders which blocks → IP HORIZON LLC 515J CHESTERLD OH
2023-10-05 440-601 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHAGRINFLS 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
2023-02-08 440-859 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 MADISON OH
2023-01-11 440-852 0XXX1XXX2XXX3XXX4XXX5XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CHARDON OH
2022-12-08 440-531 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 BEREA OH
2022-12-08 440-894 0–9 XXXwhole prefix which blocks → ONVOY, LLC - OH 464C ELYRIA OH
2022-10-10 440-433 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 LORAIN OH
2022-10-10 440-500 0–9 XXXall 10 · 2 holders which blocks → COMMIO, LLC 939H ELYRIA OH
2022-09-09 440-881 0XXX1XXX6XXX8XXX9XXX · 5 holders which blocks → METROPCS, INC. 5562 MIDDLEFLD OH
2022-05-09 440-849 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - OH 464C LORAIN OH
2022-05-09 440-851 0XXX1XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → CSC VOICE, LLC 612K BURTON OH
2022-02-25 440-889 8XXX9XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J MONTVILLE OH
2022-02-23 440-909 1XXX2XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J MESOPOTMIA OH
2022-02-23 440-928 7XXX8XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CONNEAUT OH
2022-02-17 440-977 1XXX7XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WINDSOR OH
2022-02-16 440-874 1XXX7XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J COLEBROOK OH
2022-02-16 440-927 1XXX7XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J NOBLOOMFLD OH
2022-02-14 440-825 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 ASHTABULA OH
2022-02-14 440-841 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ASHTABULA OH
2022-02-01 440-814 0XXX6XXX9XXX · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J PERRY OH
2022-02-01 440-819 0XXX1XXX2XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - OH 464C OLMSTEDFLS OH
2022-01-07 440-798 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J AMHERST OH
2021-12-15 440-692 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - OH 464C VICTORY OH
2021-12-14 440-691 0–9 XXXall 10 · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J CLEVELAND OH
2021-11-11 440-902 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H ELYRIA OH
2021-11-09 440-768 0–9 XXXall 10 · 5 holders which blocks → AT&T - LOCAL 7421 WILLOUGHBY OH
2021-11-02 440-761 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 TRINITY OH
2021-08-03 440-955 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H BAINBRIDGE OH
2021-08-03 440-966 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H STRONGSVL OH
2021-07-22 440-807 0XXX1XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - OH 464C NEW LYME OH

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.