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
2007-08-03 937-745 1XXX2XXX3XXX4XXX5XXX9XXX · 2 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K ROSEWOOD OH
2007-08-03 937-954 1XXX2XXX3XXX4XXX5XXX9XXX · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K BELLE CTR OH
2007-07-04 937-785 4XXX5XXX · 2 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K ROSSBURG OH
2007-06-26 937-736 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 XENIA OH
2007-04-05 937-639 0–9 XXXall 10 · 8 holders which blocks → GOLDSTAR COMMUNICATIONS, LLC - OH 9133 ANNA OH
2007-03-07 937-561 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SPRINGFLD OH
2007-02-16 937-720 0XXX4XXX7XXX · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K NEW PARIS OH
2007-02-16 937-737 0XXX3XXX7XXX · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K ARCANUM OH
2007-02-16 937-798 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K PEEBLES OH
2006-11-26 937-938 0–9 XXXall 10 · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K DAYTON OH
2006-10-17 937-944 0XXX1XXX2XXX3XXX4XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WILMINGTON OH
2006-10-13 937-717 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SPRINGFLD OH
2006-10-13 937-868 0XXX1XXX2XXX8XXX · 4 holders which blocks → TIER 2 COMMUNICATIONS, LLC 8168 GREENFIELD OH
2006-08-30 937-691 not yet reported which blocks → GOLDSTAR COMMUNICATIONS, LLC - OH 9133 BOTKINS OH
2006-06-30 937-703 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TROY OH
2006-06-16 937-722 0–9 XXXall 10 · 8 holders which blocks → TIER 2 COMMUNICATIONS, LLC 8168 BELLEFNTAN OH
2006-06-12 937-933 3XXX4XXX6XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7836 TERREHAUTE OH
2006-02-03 937-738 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F MARYSVILLE OH
2005-12-22 937-889 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 LIBERTY OH
2005-11-14 937-690 0XXX6XXX7XXX9XXX · 4 holders which blocks → TIER 2 COMMUNICATIONS, LLC 8168 GEORGETOWN OH
2005-06-29 937-733 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 EATON OH
2005-03-23 937-723 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 DAYTON OH
2005-03-08 937-697 0–9 XXXall 10 · 9 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CEDARVILLE OH
2005-03-08 937-714 2XXX3XXX7XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 UNION CITY OH
2005-03-04 937-817 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CHRISTISBG OH
2005-02-24 937-887 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7836 W LIBERTY OH
2005-02-23 937-719 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 WESTMILTON OH
2005-02-15 937-662 0XXX7XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7836 ARCANUM OH
2005-02-14 937-810 0XXX1XXX3XXX5XXX7XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7836 RUSSELLSPT OH
2005-02-08 937-730 1XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 ROSSBURG OH
2005-02-08 937-881 3XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 UNION CITY OH
2005-02-04 937-521 0–9 XXXall 10 · 6 holders which blocks → CINCINNATI BELL EXTENDED TERRITORIES LLC - OH 309B SPRINGFLD OH
2005-01-06 937-529 0–9 XXXall 10 · 7 holders which blocks → METROPCS, INC. 5562 TROTWOOD OH
2004-11-04 937-670 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 GREENVILLE OH
2004-08-12 937-710 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SIDNEY OH
2004-07-21 937-401 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7836 DAYTON OH
2004-04-27 937-507 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TIER 2 COMMUNICATIONS, LLC 8168 SIDNEY OH
2003-12-11 937-481 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 WILMINGTON OH
2003-11-11 937-648 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7836 DAYTON OH
2003-05-06 937-420 not yet reported which blocks → GOLDSTAR COMMUNICATIONS, LLC - OH 9133 FT LORAMIE OH
2003-05-06 937-707 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MARYSVILLE OH
2003-03-15 937-682 2XXX3XXX4XXX6XXX · 2 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K RUSHSYLVAN OH
2002-11-18 937-646 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K ANNA OH
2002-11-05 937-659 7XXX9XXX · 2 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K ANSONIA OH
2002-10-14 937-681 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 DAYTON OH
2002-09-20 937-665 2XXX8XXX9XXX · 2 holders which blocks → CINCINNATI BELL EXTENDED TERRITORIES LLC - OH 309B VANDALIA OH
2002-09-17 937-631 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 SPRINGFLD OH
2002-09-17 937-638 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 SIDNEY OH
2002-09-11 937-247 0–9 XXXall 10 · 4 holders which blocks → CINCINNATI BELL EXTENDED TERRITORIES LLC - OH 309B MSBGWCRLTN OH
2002-09-11 937-619 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CINCINNATI BELL EXTENDED TERRITORIES LLC - OH 309B CENTERVLLE 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.