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
— 937-379 3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 HAMERSVL OH
— 937-381 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J PIQUA OH
— 937-382 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 WILMINGTON OH
— 937-383 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 WILMINGTON OH
— 937-384 9XXX which blocks → OHIO BELL TEL CO 9321 MSBGWCRLTN OH
— 937-386 4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 SEAMAN OH
— 937-387 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J VANDALIA OH
— 937-388 3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J MSBGWCRLTN OH
— 937-389 0XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-390 not yet reported which blocks → OHIO BELL TEL CO 9321 SPRINGFLD OH
— 937-391 not yet reported which blocks → SPOK, INC. 6630 ENON OH
— 937-392 2XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → OHIO BELL TEL CO 9321 RIPLEY OH
— 937-393 not yet reported which blocks → OHIO BELL TEL CO 9321 HILLSBORO OH
— 937-394 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 ANNA OH
— 937-395 2XXX6XXX7XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-396 2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-398 4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J SPRINGFLD OH
— 937-399 not yet reported which blocks → OHIO BELL TEL CO 9321 SPRINGFLD OH
— 937-406 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 DAYTON OH
— 937-407 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BELLEFNTAN OH
— 937-408 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 SPRINGFLD OH
— 937-409 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
— 937-410 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 VANDALIA OH
— 937-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 937-413 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 DAYTON OH
— 937-415 not yet reported which blocks → OHIO BELL TEL CO 9321 VANDALIA OH
— 937-416 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 DAYTON OH
— 937-417 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 GREENVILLE OH
— 937-418 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 PIQUA OH
— 937-422 0XXX1XXX2XXX which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-423 6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GREENVILLE OH
— 937-424 2XXX3XXX6XXX7XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J DAYTON OH
— 937-425 not yet reported which blocks → LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 DAYTON OH
— 937-426 not yet reported which blocks → OHIO BELL TEL CO 9321 BEAVERCREK OH
— 937-427 not yet reported which blocks → OHIO BELL TEL CO 9321 BEAVERCREK OH
— 937-428 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-429 not yet reported which blocks → OHIO BELL TEL CO 9321 BEAVERCREK OH
— 937-430 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
— 937-431 not yet reported which blocks → OHIO BELL TEL CO 9321 BEAVERCREK OH
— 937-432 5XXX7XXX8XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-433 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-434 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-435 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-436 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-437 9XXX which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 NEW PARIS OH
— 937-438 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-439 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-440 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 TROY OH
— 937-441 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BELLEFNTAN OH
— 937-442 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MOWRYSTOWN 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.