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
2014-05-15 937-909 0–9 XXXall 10 · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J FLTCHELENA OH
2014-04-30 937-860 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F YLSPGCLFTN OH
2014-04-25 937-907 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F CENTERVLLE OH
2014-03-27 937-856 0–9 XXXall 10 · 3 holders which blocks → CINCINNATI BELL EXTENDED TERRITORIES LLC - OH 309B DAYTON OH
2014-03-20 937-816 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 FAIRBORN OH
2014-03-03 937-815 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2014-02-28 937-786 0–9 XXXall 10 · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J GREENVILLE OH
2014-02-26 937-762 0–9 XXXwhole prefix which blocks → LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 DAYTON OH
2013-06-03 937-805 0XXX4XXX9XXX · 2 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K WILMINGTON OH
2013-06-03 937-808 0XXX4XXX5XXX7XXX · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K GREENVILLE OH
2013-05-28 937-813 0–9 XXXall 10 · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K DAYTON OH
2013-03-11 937-818 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2012-12-10 937-803 0XXX1XXX2XXX3XXX4XXX7XXX · 4 holders which blocks → HORIZON SERVICES, INC. - OH 601G GREENFIELD OH
2012-11-27 937-802 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 551G DAYTON OH
2012-11-07 937-712 0–9 XXXall 10 · 7 holders which blocks → HORIZON SERVICES, INC. - OH 601G MOUNT ORAB OH
2012-10-17 937-706 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F SOCHARLETN OH
2012-10-17 937-801 0XXX1XXX6XXX8XXX · 4 holders which blocks → HORIZON SERVICES, INC. - OH 601G GEORGETOWN OH
2012-07-25 937-713 0–9 XXXwhole prefix which blocks → LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 DAYTON OH
2012-04-10 937-701 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 DAYTON OH
2012-03-19 937-607 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2012-03-12 937-204 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
2011-11-16 937-516 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2011-10-27 937-504 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C SPRINGFLD OH
2011-10-21 937-240 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F BELLE CTR OH
2011-10-07 937-503 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2011-08-08 937-702 0XXX1XXX3XXX4XXX7XXX9XXX · 6 holders which blocks → CINCINNATI BELL EXTENDED TERRITORIES LLC - OH 309B BEAVERCREK OH
2011-03-10 937-966 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F NO HAMPTON OH
2010-12-21 937-872 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C JAMESTOWN OH
2010-12-17 937-999 0–9 XXXall 10 · 6 holders which blocks → CINBELL EXT TERR LLC DBA ALTAFIBER CONNECTED SVCS 600F DAYTON OH
2010-11-02 937-799 0XXX8XXX9XXX · 3 holders which blocks → GOLDSTAR COMMUNICATIONS, LLC - OH 9133 VERSAILLES OH
2010-06-25 937-705 0–9 XXXall 10 · 6 holders which blocks → CINCINNATI BELL EXTENDED TERRITORIES LLC - OH 309B BEAVERCREK OH
2010-05-25 937-715 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F TROTWOOD OH
2010-03-25 937-716 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - OH 464C DAYTON OH
2010-02-23 937-709 0–9 XXXall 10 · 8 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 BELLBROOK OH
2009-12-08 937-249 0–9 XXXall 10 · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C ABERDEEN OH
2009-07-15 937-858 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TSC COMMUNICATIONS, INC. - OH 0640 BOTKINS OH
2009-07-15 937-892 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 WEST UNION OH
2009-01-27 937-734 0–9 XXXall 10 · 2 holders which blocks → CINCINNATI BELL EXTENDED TERRITORIES LLC - OH 309B DAYTON OH
2008-09-30 937-732 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
2008-09-02 937-896 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 URBANA OH
2008-07-17 937-487 0–9 XXXwhole prefix which blocks → LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 DAYTON OH
2008-05-13 937-985 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F DAYTON OH
2008-04-08 937-742 4XXX7XXX · 2 holders which blocks → AT&T ENTERPRISES, LLC 516C VANDALIA OH
2008-03-04 937-661 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HILLSBORO OH
2008-03-04 937-699 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BELLEFNTAN OH
2008-03-04 937-731 0XXX3XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GEORGETOWN OH
2008-03-03 937-683 0–9 XXXall 10 · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 EATON OH
2007-12-21 937-867 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - OH 464C DAYTON OH
2007-12-20 937-668 0–9 XXXall 10 · 3 holders which blocks → FIRST COMMUNICATIONS, LLC 460K DAYTON OH
2007-10-16 937-821 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K FT LORAMIE 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.