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
— 937-325 not yet reported which blocks → OHIO BELL TEL CO 9321 SPRINGFLD OH
— 937-327 8XXX which blocks → OHIO BELL TEL CO 9321 SPRINGFLD OH
— 937-328 not yet reported which blocks → OHIO BELL TEL CO 9321 SPRINGFLD OH
— 937-329 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
— 937-330 not yet reported which blocks → SPOK, INC. 6630 ENON OH
— 937-331 7XXX8XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-332 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 TROY OH
— 937-333 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-334 not yet reported which blocks → SPOK, INC. 6630 DAYTON OH
— 937-335 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 TROY OH
— 937-336 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 EATON OH
— 937-337 1XXX2XXX7XXX · 2 holders which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 ANSONIA OH
— 937-338 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 ROSSBURG OH
— 937-339 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 TROY OH
— 937-340 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J ENON OH
— 937-341 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-342 2XXX3XXX6XXX · 3 holders which blocks → OHIO BELL TEL CO 9321 SPRINGFLD OH
— 937-343 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J FAIRBORN OH
— 937-344 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
— 937-346 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J SPRINGFLD OH
— 937-347 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J XENIA OH
— 937-348 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 MAGNETCSPG OH
— 937-349 1XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 MILFORDCTR OH
— 937-350 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → PAETEC ITEL, LLC 829J CENTERVLLE OH
— 937-352 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J XENIA OH
— 937-353 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J MSBGWCRLTN OH
— 937-354 1XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 MT VICTORY OH
— 937-355 1XXX2XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 WMANSFIELD OH
— 937-356 3XXX6XXX8XXX9XXX · 3 holders which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-357 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 BEAVERCREK OH
— 937-358 1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 YORKCENTER OH
— 937-359 not yet reported which blocks → SPOK, INC. 6630 DAYTON OH
— 937-360 0XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SPRINGFLD OH
— 937-361 none assigned yet which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-362 1XXX7XXX · 2 holders which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 ROSEWOOD OH
— 937-363 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 RIDGEWAY OH
— 937-364 3XXX4XXX5XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 LYNCHBURG OH
— 937-365 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → OHIO BELL TEL CO 9321 RAINSBORO OH
— 937-367 0XXX which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-368 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → OHIO BELL TEL CO 9321 FLTCHELENA OH
— 937-369 0XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-370 not yet reported which blocks → SPOK, INC. 6630 ENON OH
— 937-371 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 DAYTON OH
— 937-372 not yet reported which blocks → OHIO BELL TEL CO 9321 XENIA OH
— 937-373 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 DECATUR OH
— 937-374 9XXX which blocks → OHIO BELL TEL CO 9321 XENIA OH
— 937-375 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 HIGGINSPT OH
— 937-376 not yet reported which blocks → OHIO BELL TEL CO 9321 XENIA OH
— 937-377 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 RUSSELLVL OH
— 937-378 8XXX which blocks → FRONTIER NORTH, INC. - OH 0615 GEORGETOWN 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.