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
2021-07-02 440-795 0XXX2XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → ONVOY, LLC - OH 464C KINGSVILLE OH
2021-06-23 440-741 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H VICTORY OH
2021-06-22 440-698 0XXX3XXX5XXX9XXX · 3 holders which blocks → ONVOY, LLC - OH 464C NEWBURY OH
2021-06-22 440-738 0XXX1XXX2XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - OH 464C VERMILION OH
2021-06-21 440-726 0XXX2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → ONVOY, LLC - OH 464C THOMPSON OH
2021-06-17 440-705 0XXX1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H MIDDLEFLD OH
2021-06-17 440-757 5XXX6XXX7XXX8XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H NEWBURY OH
2021-06-17 440-765 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H RUSSELL OH
2021-06-17 440-767 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H PAINESVL OH
2021-06-17 440-778 1XXX2XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H PIERPONT OH
2021-05-10 440-780 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H AVON OH
2021-05-10 440-790 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H GENEVA OH
2021-05-10 440-820 0XXX2XXX3XXX8XXX9XXX · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H HUNTSBURG OH
2021-05-10 440-844 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY SPECTRUM, LLC 624H MADISON OH
2021-05-10 440-890 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H MENTOR OH
2021-04-26 440-697 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 HILLCREST OH
2021-04-22 440-696 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → HD CARRIER LLC 321J BRECKSVL OH
2021-04-13 440-694 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ASHTABULA OH
2021-03-30 440-690 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - OH 464C ELYRIA OH
2021-03-26 440-880 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - OH 464C AUSTINBURG OH
2021-02-03 440-766 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - OH 464C LORAIN 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
2020-08-12 440-672 0–9 XXXall 10 · 3 holders which blocks → HD CARRIER LLC 321J CLEVELAND OH
2020-05-28 440-659 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - OH 464C PERRY OH
2020-05-28 440-664 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → ONVOY, LLC - OH 464C KIRTLAND OH
2020-05-28 440-750 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - OH 464C PARKMAN OH
2020-05-01 440-755 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H ASHTABULA OH
2020-04-09 440-656 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 STRONGSVL OH
2020-03-18 440-648 6XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 ORWELL OH
2020-02-10 440-634 0–9 XXXall 10 · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 AMHERST OH
2019-12-18 440-629 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHARDON OH
2019-06-12 440-598 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - OH 464C BIRMINGHAM OH
2019-02-13 440-553 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 ASHTABULA OH
2018-12-05 440-581 0–9 XXXall 10 · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 ELYRIA OH
2018-10-22 440-643 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF OHIO, LLC - OH 284F COLUMBISTA OH
2018-07-12 440-613 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 VICTORY OH
2018-04-09 440-597 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 AMHERST OH
2018-03-22 440-595 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F VERMILION OH
2018-03-21 440-589 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHAGRINFLS OH
2017-11-17 440-587 0XXX1XXX2XXX3XXX4XXX6XXX8XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J BRECKSVL OH
2017-11-17 440-588 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J TRINITY OH
2017-11-08 440-586 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J BEREA OH
2017-08-30 440-568 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D CLEVELAND OH
2017-08-22 440-566 0–9 XXXall 10 · 2 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K HILLCREST OH
2017-08-02 440-517 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K AVON OH
2017-07-06 440-514 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHAGRINFLS OH
2017-07-05 440-640 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - OH 464C TRINITY OH
2017-04-18 440-592 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 BRECKSVL OH
2017-04-12 440-932 0–9 XXXall 10 · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 HILLCREST 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.