NumberResearch Membership · Data 10/01/2026

Recent prefix assignments

374 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 10/01/2026

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, last 30 days
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
New assignments by month Oct 2026 Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025
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Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 513-238 not yet reported which blocks → T-MOBILE USA, INC. 6529 CINCINNATI OH
— 513-239 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7836 LTL MIAMI OH
— 513-240 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-241 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-242 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-243 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-244 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-245 4XXX8XXX · 2 holders which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-246 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-247 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-248 not yet reported which blocks → CINCINNATI BELL 9348 LTL MIAMI OH
— 513-249 not yet reported which blocks → SPOK, INC. 6630 CINCINNATI OH
— 513-251 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-252 0XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 CINCINNATI OH
— 513-253 0XXX which blocks → T-MOBILE USA, INC. 6529 CINCINNATI OH
— 513-254 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 CINCINNATI OH
— 513-255 9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 OXFORD OH
— 513-256 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-257 0XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 CINCINNATI OH
— 513-258 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 CINCINNATI OH
— 513-259 0XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 CINCINNATI OH
— 513-260 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-262 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-263 0XXX which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-264 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-265 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-266 9XXX which blocks → T-MOBILE USA, INC. 6529 CINCINNATI OH
— 513-267 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 MIDDLETOWN OH
— 513-268 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 SO LEBANON OH
— 513-269 not yet reported which blocks → SPOK, INC. 6630 CINCINNATI OH
— 513-271 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-272 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-273 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 OXFORD OH
— 513-274 0XXX2XXX3XXX4XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 LTL MIAMI OH
— 513-275 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 HAMILTON OH
— 513-276 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
— 513-277 0XXX1XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-278 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BETHEL OH
— 513-279 2XXX3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 HARRISON OH
— 513-281 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-284 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CINCINNATI OH
— 513-285 2XXX3XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 HAMILTON OH
— 513-286 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CLERMONT OH
— 513-287 0XXX9XXX which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-288 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CINCINNATI OH
— 513-289 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CINCINNATI OH
— 513-290 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CINCINNATI OH
— 513-293 not yet reported which blocks → T-MOBILE USA, INC. 6529 CINCINNATI OH
— 513-294 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 NEWTONSVL OH
— 513-295 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CINCINNATI OH

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 10/01/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.