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
— 937-593 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 BELLEFNTAN OH
— 937-594 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MARYSVILLE OH
— 937-596 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 JACKSONCTR OH
— 937-597 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BELLEFNTAN OH
— 937-599 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 BELLEFNTAN OH
— 937-602 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 DAYTON OH
— 937-603 none assigned yet which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-604 none assigned yet which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-605 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SPRINGFLD OH
— 937-606 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 PIQUA OH
— 937-608 2XXX3XXX4XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-609 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 DAYTON OH
— 937-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 937-613 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 DAYTON OH
— 937-614 not yet reported which blocks → OH
— 937-615 2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → OHIO BELL TEL CO 9321 PIQUA OH
— 937-620 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 DAYTON OH
— 937-622 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SIDNEY OH
— 937-623 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 DAYTON OH
— 937-624 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → METROPCS, INC. 5562 SPRINGFLD OH
— 937-626 8XXX which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-627 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-628 not yet reported which blocks → SPOK, INC. 6630 DAYTON OH
— 937-629 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → OHIO BELL TEL CO 9321 SPRINGFLD OH
— 937-630 1XXX2XXX3XXX4XXX · 4 holders which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-635 not yet reported which blocks → SPOK, INC. 6630 ENON OH
— 937-636 not yet reported which blocks → SPOK, INC. 6630 DAYTON OH
— 937-640 0XXX1XXX2XXX3XXX6XXX · 4 holders which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-641 0XXX1XXX8XXX9XXX · 3 holders which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-642 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 MARYSVILLE OH
— 937-643 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-644 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 MARYSVILLE OH
— 937-645 none assigned yet which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 MARYSVILLE OH
— 937-647 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 DAYTON OH
— 937-649 0XXX1XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BELLEFNTAN OH
— 937-652 not yet reported which blocks → THE CHAMPAIGN TELEPHONE COMPANY 0594 URBANA OH
— 937-653 not yet reported which blocks → THE CHAMPAIGN TELEPHONE COMPANY 0594 URBANA OH
— 937-654 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
— 937-655 6XXX7XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 WILMINGTON OH
— 937-656 not yet reported which blocks → LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 DAYTON OH
— 937-657 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 DAYTON OH
— 937-658 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SIDNEY OH
— 937-660 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 DAYTON OH
— 937-663 1XXX2XXX3XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM OHIO, LLC 0665 ST PARIS OH
— 937-666 1XXX6XXX7XXX8XXX · 4 holders which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 E LIBERTY OH
— 937-667 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 TIPP CITY OH
— 937-669 7XXX which blocks → FRONTIER NORTH, INC. - OH 0615 TIPP CITY OH
— 937-671 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 DAYTON OH
— 937-672 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 DAYTON OH
— 937-673 none assigned yet which blocks → T-MOBILE USA, INC. 6529 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.