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
— 937-498 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 SIDNEY OH
— 937-499 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-506 0–9 XXXall 10 · 8 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K TIPP CITY OH
— 937-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 937-512 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-513 not yet reported which blocks → OH
— 937-514 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7836 FRANKLIN OH
— 937-522 0–9 XXXall 10 · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K DAYTON OH
— 937-523 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 SPRINGFLD OH
— 937-524 0XXX2XXX5XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 TROY OH
— 937-525 not yet reported which blocks → OHIO BELL TEL CO 9321 SPRINGFLD OH
— 937-526 2XXX which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 VERSAILLES OH
— 937-527 0XXX2XXX4XXX5XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 WILMINGTON OH
— 937-528 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-530 0–9 XXXall 10 · 8 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F MSBGWCRLTN OH
— 937-532 0XXX1XXX2XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 XENIA OH
— 937-533 2XXX3XXX4XXX5XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 EATON OH
— 937-534 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-535 not yet reported which blocks → CINCINNATI BELL EXTENDED TERRITORIES LLC - OH 309B DAYTON OH
— 937-536 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 SPRINGFLD OH
— 937-537 2XXX3XXX4XXX5XXX9XXX · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 MARYSVILLE OH
— 937-538 2XXX3XXX4XXX5XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 SIDNEY OH
— 937-539 3XXX4XXX5XXX7XXX9XXX · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 BELLEFNTAN OH
— 937-540 0–9 XXXall 10 · 7 holders which blocks → CINCINNATI BELL EXTENDED TERRITORIES LLC - OH 309B ENGLEWOOD OH
— 937-541 0XXX2XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 PIQUA OH
— 937-542 0XXX1XXX2XXX9XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-543 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 NEWCARLISL OH
— 937-544 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 WEST UNION OH
— 937-545 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 DAYTON OH
— 937-546 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
— 937-547 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 GREENVILLE OH
— 937-548 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 GREENVILLE OH
— 937-549 0XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MANCHESTER OH
— 937-552 0–9 XXXall 10 · 7 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K TROY OH
— 937-554 not yet reported which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST OH
— 937-560 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 MSBGWCRLTN OH
— 937-562 0XXX1XXX2XXX3XXX8XXX · 4 holders which blocks → OHIO BELL TEL CO 9321 XENIA OH
— 937-567 2XXX7XXX8XXX · 2 holders which blocks → AT&T ENTERPRISES, LLC 516C DAYTON OH
— 937-568 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → OHIO BELL TEL CO 9321 SO VIENNA OH
— 937-572 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 DAYTON OH
— 937-575 not yet reported which blocks → GOLDSTAR COMMUNICATIONS, LLC - OH 9133 SIDNEY OH
— 937-578 none assigned yet which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 MARYSVILLE OH
— 937-581 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
— 937-584 0XXX3XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 SABINA OH
— 937-585 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 DE GRAFF OH
— 937-586 7XXX8XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-587 0XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PEEBLES OH
— 937-588 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 SINKINGSPG OH
— 937-592 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 BELLEFNTAN 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.