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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2001-08-29 937-508 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 URBANA OH
2001-08-26 937-894 1XXX3XXX4XXX6XXX8XXX9XXX · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K BOTKINS OH
2001-08-26 937-895 0–9 XXXall 10 · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K GERMANTOWN OH
2001-08-24 937-841 0XXX7XXX · 2 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K GETTYSBURG OH
2001-08-23 937-827 0XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K VERSAILLES OH
2001-08-23 937-876 3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 GREENFIELD OH
2001-08-08 937-405 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 NEWCARLISL OH
2001-07-26 937-684 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 DAYTON OH
2001-07-26 937-688 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 SPRINGFLD OH
2001-07-11 937-625 0XXX1XXX3XXX4XXX8XXX · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K BLANCHESTR OH
2001-07-11 937-632 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K PLEASANTHL OH
2001-07-11 937-633 1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K RUSSELLSPT OH
2001-07-11 937-677 2XXX which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J DAYTON OH
2001-07-03 937-650 not yet reported which blocks → CT COMMUNICATIONS NETWORK, INC. - OH 5632 W LIBERTY OH
2001-07-03 937-651 not yet reported which blocks → CT COMMUNICATIONS NETWORK, INC. - OH 5632 BELLEFNTAN OH
2001-06-26 937-450 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SPRINGFLD OH
2001-06-26 937-451 3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PIQUA OH
2001-05-29 937-752 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 SEAMAN OH
2001-05-29 937-753 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 COVINGTON OH
2001-05-29 937-755 1XXX2XXX4XXX5XXX7XXX · 5 holders which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 NEWMADISON OH
2001-05-29 937-756 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 SOUTHSOLON OH
2001-05-29 937-757 1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 WMANCHESTR OH
2001-05-29 937-758 1XXX3XXX5XXX6XXX7XXX · 4 holders which blocks → WINDSTREAM OHIO, LLC 0665 ST PARIS OH
2001-05-29 937-822 1XXX2XXX6XXX8XXX · 4 holders which blocks → TWILIO INTERNATIONAL, INC. 506J GEORGETOWN OH
2001-05-22 937-303 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 MARYSVILLE OH
2001-05-22 937-404 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 BELLEFNTAN OH
2001-05-21 937-520 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
2001-05-17 937-421 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 JACKSONCTR OH
2001-05-15 937-203 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 DAYTON OH
2001-05-11 937-366 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 WILMINGTON OH
2001-05-11 937-403 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HILLSBORO OH
2001-04-19 937-806 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J FRANKLIN OH
2001-03-26 937-302 1XXX2XXX3XXX4XXX5XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 WILMINGTON OH
2001-03-13 937-728 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 WILMINGTON OH
2001-02-28 937-380 8XXX which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2001-02-06 937-402 2XXX3XXX4XXX5XXX · 3 holders which blocks → METROPCS, INC. 5562 HILLSBORO OH
2001-02-06 937-790 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 FRANKLIN OH
2001-01-31 937-558 2XXX6XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J DAYTON OH
2001-01-24 937-580 0–9 XXXall 10 · 2 holders which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-201 not yet reported which blocks → SPOK, INC. 6630 DAYTON OH
— 937-205 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 HILLSBORO OH
— 937-206 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 SPRINGFLD OH
— 937-207 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 SPRINGFLD OH
— 937-208 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-209 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 MARYSVILLE OH
— 937-210 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BELLEFNTAN OH
— 937-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 937-212 6XXX7XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
— 937-213 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GEORGETOWN OH
— 937-214 4XXX5XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PIQUA 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.