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 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
— 937-443 1XXX7XXX which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-444 5XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MOUNT ORAB OH
— 937-445 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-446 0XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 SARDINIA OH
— 937-447 1XXX6XXX · 2 holders which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 GETTYSBURG OH
— 937-448 3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 BRADFORD OH
— 937-449 0XXX3XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-452 2XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 CAMDEN OH
— 937-453 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → OHIO BELL TEL CO 9321 BOWERSVLLE OH
— 937-454 not yet reported which blocks → OHIO BELL TEL CO 9321 VANDALIA OH
— 937-455 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-456 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 EATON OH
— 937-457 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-458 3XXX5XXX6XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J BEAVERCREK OH
— 937-459 1XXX3XXX4XXX5XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 GREENVILLE OH
— 937-461 0XXX which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-462 0XXX1XXX2XXX3XXX4XXX5XXX6XXX · 6 holders which blocks → OHIO BELL TEL CO 9321 SOCHARLETN OH
— 937-463 3XXX which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-464 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 BELLE CTR OH
— 937-465 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 W LIBERTY OH
— 937-466 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → OHIO BELL TEL CO 9321 MARSHALL OH
— 937-467 0XXX2XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 GREENVILLE OH
— 937-468 1XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 RUSHSYLVAN OH
— 937-469 7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-470 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 DAYTON OH
— 937-471 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 SPRINGFLD OH
— 937-472 5XXX8XXX · 2 holders which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 EATON OH
— 937-473 not yet reported which blocks → WINDSTREAM OHIO, LLC 0665 COVINGTON OH
— 937-474 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 DAYTON OH
— 937-475 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 DAYTON OH
— 937-476 1XXX4XXX7XXX9XXX · 3 holders which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-477 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 DAYTON OH
— 937-478 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 DAYTON OH
— 937-479 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 DAYTON OH
— 937-480 not yet reported which blocks → SPOK, INC. 6630 DAYTON OH
— 937-482 5XXX6XXX7XXX8XXX9XXX which blocks → PAETEC ITEL, LLC 829J FAIRBORN OH
— 937-483 1XXX2XXX3XXX4XXX5XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 GEORGETOWN OH
— 937-484 not yet reported which blocks → THE CHAMPAIGN TELEPHONE COMPANY 0594 URBANA OH
— 937-485 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-486 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PT WILLIAM OH
— 937-488 0XXX3XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → FRONTIER NORTH, INC. - OH 0615 NEWBRLNGTN OH
— 937-489 0XXX2XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 SIDNEY OH
— 937-490 1XXX3XXX6XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 BEAVERCREK OH
— 937-491 not yet reported which blocks → SPOK, INC. 6630 ENON OH
— 937-492 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 SIDNEY OH
— 937-493 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 SIDNEY OH
— 937-494 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 SIDNEY OH
— 937-495 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-496 5XXX which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-497 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 SIDNEY 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.