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
2002-09-06 937-618 2XXX3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GEORGETOWN OH
2002-09-05 937-621 5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GREENVILLE OH
2002-08-22 937-582 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 DE GRAFF OH
2002-08-22 937-589 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 HUNTSVILLE OH
2002-08-22 937-590 7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 UNION CITY OH
2002-08-22 937-595 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BELLEFNTAN OH
2002-08-22 937-598 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 E LIBERTY OH
2002-08-22 937-601 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 WMANSFIELD OH
2002-08-22 937-610 6XXX7XXX8XXX9XXX · 2 holders which blocks → CINCINNATI BELL EXTENDED TERRITORIES LLC - OH 309B DAYTON OH
2002-08-22 937-612 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 NO LEWISBG OH
2002-08-22 937-617 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 RIDGEWAY OH
2002-08-16 937-556 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 WILMINGTON OH
2002-08-16 937-577 6XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CLARKSVL OH
2002-08-16 937-579 0XXX1XXX5XXX7XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 LYNCHBURG OH
2002-08-12 937-591 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SPRINGFLD OH
2002-07-30 937-634 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 GRATIS OH
2002-07-29 937-576 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 VANDALIA OH
2002-06-25 937-202 1XXX2XXX4XXX7XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 HOLLANSBG OH
2002-06-25 937-551 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 PHILLIPSBG OH
2002-06-25 937-566 1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PEERLESS NETWORK OF OHIO, LLC - OH 284F WILMINGTON OH
2002-06-25 937-573 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 TROY OH
2002-06-25 937-574 1XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CLARKSVL OH
2002-06-25 937-583 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 LEWISBURG OH
2002-06-12 937-553 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 MARYSVILLE OH
2002-06-05 937-501 1XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CLARKSVL OH
2002-06-05 937-571 1XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 WILMINGTON OH
2002-05-28 937-570 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 PIQUA OH
2002-05-15 937-550 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 FRANKLIN OH
2002-05-08 937-565 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BELLEFNTAN OH
2002-05-06 937-564 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 GREENVILLE OH
2002-04-10 937-779 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 WEST UNION OH
2002-04-02 937-770 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7836 BROOKVILLE OH
2002-04-02 937-771 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 ENGLEWOOD OH
2002-03-18 937-510 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
2002-02-28 937-557 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 FRANKLIN OH
2002-02-25 937-509 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 HILLSBORO OH
2002-02-21 937-412 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 FAIRBORN OH
2002-02-21 937-502 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 XENIA OH
2002-02-12 937-460 0–9 XXXall 10 · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C SPRINGFLD OH
2001-12-26 937-531 1XXX7XXX8XXX9XXX which blocks → LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 DAYTON OH
2001-12-17 937-397 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
2001-12-17 937-789 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
2001-12-12 937-419 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 SIDNEY OH
2001-12-12 937-515 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 GEORGETOWN OH
2001-12-12 937-569 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 GREENVILLE OH
2001-11-26 937-505 0XXX1XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → OHIO BELL TEL CO 9321 SPRINGFLD OH
2001-10-30 937-270 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
2001-10-30 937-718 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
2001-10-04 937-414 1XXX2XXX3XXX4XXX5XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2001-09-14 937-559 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 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.