NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

1 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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 — NPA 405
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 1
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
— 405-275 not yet reported which blocks → SOUTHWESTERN BELL 9533 SHAWNEE OK
— 405-277 0XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 LUTHER OK
— 405-278 1XXX which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-279 0XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 MEEKER OK
— 405-280 3XXX which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-281 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J CHOCTAW OK
— 405-282 not yet reported which blocks → SOUTHWESTERN BELL 9533 GUTHRIE OK
— 405-283 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J PIEDMONT OK
— 405-284 not yet reported which blocks → HINTON TEL. CO. OF HINTON OK, INC. 1995 CEDAR LAKE OK
— 405-285 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J EDMOND OK
— 405-286 4XXX6XXX9XXX which blocks → COMCAST IP PHONE, LLC 318J BRITTON OK
— 405-287 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TECUMSEH OK
— 405-288 1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 WASHINGTON OK
— 405-289 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 ST LOUIS OK
— 405-290 8XXX which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-291 0XXX which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-292 4XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 NORMAN OK
— 405-293 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J GUTHRIE OK
— 405-294 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J NOBLE OK
— 405-295 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J EL RENO OK
— 405-296 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - OK 409F CROMWELL OK
— 405-297 4XXX which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-298 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KINGFISHER OK
— 405-299 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - OK 409F CALVIN OK
— 405-302 8XXX which blocks → SOUTHWESTERN BELL 9533 BRITTON OK
— 405-303 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 SEMINOLE OK
— 405-304 not yet reported which blocks → SPOK, INC. 6630 OKLA CITY OK
— 405-306 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OKLA CITY OK
— 405-307 not yet reported which blocks → SOUTHWESTERN BELL 9533 NORMAN OK
— 405-309 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - OK 119F HARRAH OK
— 405-310 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J NORMAN OK
— 405-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 405-314 not yet reported which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-319 0XXX which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-320 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICKASHA OK
— 405-321 not yet reported which blocks → SOUTHWESTERN BELL 9533 NORMAN OK
— 405-322 5XXX6XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 NORMAN OK
— 405-324 not yet reported which blocks → SOUTHWESTERN BELL 9533 YUKON OK
— 405-325 not yet reported which blocks → SOUTHWESTERN BELL 9533 NORMAN OK
— 405-326 not yet reported which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-327 not yet reported which blocks → SPOK, INC. 6630 OKLA CITY OK
— 405-329 not yet reported which blocks → SOUTHWESTERN BELL 9533 NORMAN OK
— 405-330 not yet reported which blocks → SOUTHWESTERN BELL 9533 EDMOND OK
— 405-331 0–9 XXXall 10 · 5 holders which blocks → CSC VOICE, LLC 612K PAULS VLY OK
— 405-332 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 STILLWATER OK
— 405-333 not yet reported which blocks → POTTAWATOMIE TEL. CO. 2020 PEARSON OK
— 405-335 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - OK 409F WYNNEWOOD OK
— 405-336 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - OK 409F WELEETKA OK
— 405-337 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - OK 409F WEWOKA OK
— 405-338 0–9 XXXall 10 · 8 holders which blocks → T-MOBILE USA, INC. 6529 STILLWATER OK

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.