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 937
OHIO BELL TEL CO 159
NEW CINGULAR WIRELESS PCS, LLC - IL 73
T-MOBILE USA, INC. 64
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 61
BRIGHTSPEED OF NORTHWEST OHIO, INC. 55
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
2024-04-04 937-774 0XXX7XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 PIQUA OH
2024-02-20 937-326 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 MSBGWCRLTN OH
2024-02-20 937-983 0XXX1XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 TIPP CITY OH
2024-02-06 937-851 0–9 XXXall 10 · 4 holders which blocks → IP HORIZON LLC 515J NEWCARLISL OH
2024-02-06 937-924 0–9 XXXall 10 · 5 holders which blocks → IP HORIZON LLC 515J MARYSVILLE OH
2024-02-06 937-948 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → IP HORIZON LLC 515J SIDNEY OH
2023-08-04 937-946 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 XENIA OH
2023-07-27 937-961 2XXX which blocks → WABASH MUTUAL TELEPHONE COMPANY - OH 669D GREENVILLE OH
2023-04-19 937-517 1XXX which blocks → TWC IP ENABLED SERVICES, LLC 793K SINKINGSPG OH
2023-04-11 937-385 0XXX1XXX3XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H DECATUR OH
2023-04-11 937-953 0XXX1XXX8XXX9XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H MANCHESTER OH
2022-11-17 937-920 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 SPRINGFLD OH
2022-11-08 937-351 0–9 XXXall 10 · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 MARYSVILLE OH
2022-07-21 937-345 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F DAYTON OH
2022-05-06 937-943 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CSC VOICE, LLC 612K TROY OH
2022-03-09 937-955 0XXX1XXX2XXX5XXX7XXX9XXX · 5 holders which blocks → METROPCS, INC. 5562 GERMANTOWN OH
2022-02-25 937-945 0XXX1XXX7XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F SOUTHSOLON OH
2022-02-17 937-906 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J DAYTON OH
2022-02-04 937-934 0XXX1XXX2XXX4XXX · 3 holders which blocks → ONVOY, LLC - OH 464C JACKSONCTR OH
2022-02-01 937-942 2XXX4XXX7XXX9XXX · 3 holders which blocks → ONVOY, LLC - OH 464C HIGGINSPT OH
2022-01-28 937-861 0XXX1XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 EATON OH
2022-01-19 937-820 0–9 XXXall 10 · 8 holders which blocks → T-MOBILE USA, INC. 6529 HILLSBORO OH
2021-12-10 937-819 0–9 XXXall 10 · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 MARYSVILLE OH
2021-12-03 937-891 8XXX which blocks → TWILIO INTERNATIONAL, INC. 506J CEDARVILLE OH
2021-07-22 937-905 0XXX1XXX5XXX6XXX9XXX · 3 holders which blocks → ONVOY, LLC - OH 464C WMANSFIELD OH
2021-07-16 937-814 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - OH 464C DAYTON OH
2021-06-21 937-812 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - OH 464C XENIA OH
2021-04-02 937-796 0–9 XXXall 10 · 3 holders which blocks → TELNYX LLC 073H FAIRBORN OH
2021-03-19 937-794 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 PIQUA OH
2021-02-16 937-793 0–9 XXXall 10 · 4 holders which blocks → IP HORIZON LLC 515J DAYTON OH
2021-01-27 937-792 4XXX6XXX7XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H WEST UNION OH
2020-09-01 937-791 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 478J DAYTON OH
2020-08-04 937-518 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J DAYTON OH
2020-05-28 937-932 0XXX1XXX2XXX3XXX · 2 holders which blocks → ONVOY, LLC - OH 464C HUNTSVILLE OH
2020-05-28 937-984 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → TWILIO INTERNATIONAL, INC. 506J MILFORDCTR OH
2020-05-28 937-989 0XXX1XXX2XXX3XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - OH 464C YORKCENTER OH
2020-05-20 937-784 0–9 XXXall 10 · 2 holders which blocks → CSC WIRELESS, LLC 425J DAYTON OH
2019-10-25 937-930 0–9 XXXall 10 · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H DAYTON OH
2019-10-03 937-761 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TROY OH
2019-09-13 937-759 0–9 XXXall 10 · 4 holders which blocks → EXIANT COMMUNICATIONS LLC 114J DAYTON OH
2019-05-16 937-749 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F PIQUA OH
2019-03-19 937-800 0–9 XXXall 10 · 3 holders which blocks → TERRA NOVA TELECOM INC. 145J DAYTON OH
2018-07-30 937-744 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K TIPP CITY OH
2018-04-09 937-637 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - OH 464C DAYTON OH
2018-03-26 937-519 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D DAYTON OH
2018-02-22 937-897 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - OH 464C SIDNEY OH
2017-11-01 937-900 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - OH 464C BEAVERCREK OH
2017-10-31 937-600 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - OH 464C XENIA OH
2017-07-28 937-500 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 HILLSBORO OH
2017-06-20 937-739 0–9 XXXall 10 · 3 holders which blocks → COMMIO, LLC 939H DAYTON 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.