NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

1 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, last 30 days — NPA 580
ONVOY, LLC - OK 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
— 580-421 none assigned yet which blocks → SOUTHWESTERN BELL 9533 ADA OK
— 580-422 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - OK 409F BILLINGS OK
— 580-423 not yet reported which blocks → PANHANDLE TELEPHONE COOPERATIVE, INC. 2016 TEXHOMA OK
— 580-426 not yet reported which blocks → PANHANDLE TELEPHONE COOPERATIVE, INC. 2016 FELTWHLESS OK
— 580-427 not yet reported which blocks → ONVOY, LLC - OK 409F ADA OK
— 580-428 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 CLARITA OK
— 580-429 4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 CACHE OK
— 580-430 0XXX which blocks → SOUTHWESTERN BELL 9533 ALVA OK
— 580-431 not yet reported which blocks → SOUTH CENTRAL TEL ASSN INC 1831 BURLINGTON OK
— 580-432 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 ELMOREWEST OK
— 580-434 not yet reported which blocks → CHEROKEE TEL. CO. 1979 CALERA OK
— 580-435 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 HOPETON OK
— 580-436 not yet reported which blocks → SOUTHWESTERN BELL 9533 ADA OK
— 580-437 not yet reported which blocks → TERRAL TEL. CO. 2029 TERRAL OK
— 580-438 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 CLEO SPG OK
— 580-439 none assigned yet which blocks → PIONEER TEL. COOP., INC. 2018 COMANCHE OK
— 580-440 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 KAW CITY OK
— 580-441 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WINDSTREAM OKLAHOMA, INC. 1965 ELMORECITY OK
— 580-442 not yet reported which blocks → SOUTHWESTERN BELL 9533 LAWTON OK
— 580-443 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 MILBURN OK
— 580-444 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 VELMA OK
— 580-445 2XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CLINTON OK
— 580-446 2XXX3XXX6XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 BRECKENRDG OK
— 580-448 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 SARKNSASCY OK
— 580-449 0XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 CHEYENNE OK
— 580-450 3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 WALTERS OK
— 580-455 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 ORLANDO OK
— 580-456 0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 ROFF OK
— 580-458 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LAWTON OK
— 580-460 not yet reported which blocks → SOUTHWESTERN BELL 9533 LAWTON OK
— 580-463 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 ALINE OK
— 580-464 4XXX6XXX8XXX · 3 holders which blocks → OKLAHOMA COMMUNICATION SYSTEM, INC. 1984 CYRIL OK
— 580-465 none assigned yet which blocks → UNITED STATES CELLULAR - OK 6272 ARDMORE OK
— 580-467 9XXX which blocks → UNITED STATES CELLULAR - OK 6272 DUNCAN OK
— 580-468 not yet reported which blocks → PANHANDLE TELEPHONE COOPERATIVE, INC. 2016 GUYMON OK
— 580-470 6XXX which blocks → SOUTHWESTERN BELL 9533 DUNCAN OK
— 580-471 none assigned yet which blocks → UNITED STATES CELLULAR - OK 6272 ALTUS OK
— 580-472 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 CANUTE OK
— 580-473 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 HAMMON OK
— 580-474 not yet reported which blocks → SOUTH CENTRAL TEL ASSN INC 1831 BYRON OK
— 580-475 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 DUNCAN OK
— 580-476 0XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 RUSH SPG OK
— 580-477 not yet reported which blocks → SOUTHWESTERN BELL 9533 ALTUS OK
— 580-478 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ENID OK
— 580-479 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 GRANDFIELD OK
— 580-480 2XXX which blocks → SOUTHWESTERN BELL 9533 ALTUS OK
— 580-481 none assigned yet which blocks → SOUTHWESTERN BELL 9533 ALTUS OK
— 580-482 9XXX which blocks → SOUTHWESTERN BELL 9533 ALTUS OK
— 580-483 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 LAWTON OK
— 580-484 7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 ENID OK

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.