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
— 937-215 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SPRINGFLD OH
— 937-216 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TROY OH
— 937-217 2XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WEST UNION OH
— 937-218 7XXX8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WILMINGTON OH
— 937-219 0XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-220 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-221 8XXX9XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-222 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-223 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-224 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-225 1XXX which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-226 9XXX which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-227 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-228 9XXX which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-229 6XXX which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-231 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
— 937-232 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
— 937-233 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-234 3XXX4XXX7XXX · 3 holders which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-235 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-236 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-237 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-238 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
— 937-239 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
— 937-241 0XXX which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-242 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 DAYTON OH
— 937-243 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 MARYSVILLE OH
— 937-244 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SPRINGFLD OH
— 937-245 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
— 937-246 1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 RAYMOND OH
— 937-248 0XXX2XXX · 2 holders which blocks → METROPCS, INC. 5562 TROTWOOD OH
— 937-251 9XXX which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
— 937-252 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-253 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-254 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-255 not yet reported which blocks → LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 DAYTON OH
— 937-256 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-257 not yet reported which blocks → LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 DAYTON OH
— 937-258 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-259 4XXX8XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-260 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
— 937-262 4XXX7XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-263 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-264 7XXX which blocks → OHIO BELL TEL CO 9321 VANDALIA OH
— 937-265 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → OHIO BELL TEL CO 9321 PITCHIN OH
— 937-266 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
— 937-267 0XXX1XXX2XXX4XXX6XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-268 not yet reported which blocks → OHIO BELL TEL CO 9321 DAYTON OH
— 937-269 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 DAYTON OH
— 937-271 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 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.