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 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
— 580-571 none assigned yet which blocks → SOUTHWESTERN BELL 9533 WOODWARD OK
— 580-572 0XXX1XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 PERRY OK
— 580-576 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 6 holders which blocks → ONVOY, LLC - OK 409F PONCA CITY OK
— 580-580 not yet reported which blocks → OK
— 580-581 9XXX which blocks → SOUTHWESTERN BELL 9533 LAWTON OK
— 580-582 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 PUTNAM OK
— 580-583 5XXX6XXX7XXX8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LAWTON OK
— 580-584 not yet reported which blocks → PINE TEL. CO. 2017 BROKEN BOW OK
— 580-585 8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 LAWTON OK
— 580-587 5XXX6XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 RATTAN OK
— 580-588 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 APACHE OK
— 580-589 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 SO COLDWTR OK
— 580-591 none assigned yet which blocks → SOUTHWESTERN BELL 9533 LAWTON OK
— 580-592 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 FOSS OK
— 580-593 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 CUSTERCITY OK
— 580-594 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 WAKITA OK
— 580-595 none assigned yet which blocks → SOUTHWESTERN BELL 9533 LAWTON OK
— 580-596 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → SOUTHWESTERN BELL 9533 CHEROKEE OK
— 580-597 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 CHATTANOGA OK
— 580-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 580-614 none assigned yet which blocks → PIONEER TEL. COOP., INC. 2018 WATONGA OK
— 580-617 not yet reported which blocks → PANHANDLE TELECOMMUNICATIONS SYSTEMS, INC. 468B GUYMON OK
— 580-618 7XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SULPHUR OK
— 580-620 not yet reported which blocks → CHOICE WIRELESS, LC 3533 LAWTON OK
— 580-621 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 FREEDOM OK
— 580-622 not yet reported which blocks → CHICKASAW TEL. CO. 1980 SULPHUR OK
— 580-623 none assigned yet which blocks → PIONEER TEL. COOP., INC. 2018 WATONGA OK
— 580-625 not yet reported which blocks → PANHANDLE TELEPHONE COOPERATIVE, INC. 2016 BEAVER OK
— 580-626 not yet reported which blocks → KANOKLA TEL ASSN 1788 JET OK
— 580-628 4XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 TONKAWA OK
— 580-633 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ELDORADO OK
— 580-635 0XXX3XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 HILLSDALE OK
— 580-637 not yet reported which blocks → CARNEGIE TEL. CO. 1976 ALFALFA OK
— 580-638 1XXX8XXX · 2 holders which blocks → MID-AMERICA TEL., INC. 2010 BROMIDE OK
— 580-639 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 ROOSEVELT OK
— 580-641 4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → UNITED STATES CELLULAR - OK 6272 MARLOW OK
— 580-646 not yet reported which blocks → PANHANDLE TELEPHONE COOPERATIVE, INC. 2016 BALKO OK
— 580-648 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 OLUSTEE OK
— 580-650 2XXX3XXX · 2 holders which blocks → METROPCS, INC. 5562 WEATHERFD OK
— 580-651 not yet reported which blocks → PANHANDLE TELECOMMUNICATIONS SYSTEMS, INC. 468B GUYMON OK
— 580-652 not yet reported which blocks → PANHANDLE TELEPHONE COOPERATIVE, INC. 2016 HOOKER OK
— 580-653 not yet reported which blocks → CHICKASAW TEL. CO. 1980 SPRINGER OK
— 580-654 not yet reported which blocks → CARNEGIE TEL. CO. 1976 CARNEGIE OK
— 580-655 not yet reported which blocks → DOBSON TEL. CO. 1988 REYDON OK
— 580-657 not yet reported which blocks → CHICKASAW TEL. CO. 1980 LONE GROVE OK
— 580-658 0XXX8XXX which blocks → SOUTHWESTERN BELL 9533 MARLOW OK
— 580-661 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 THOMAS OK
— 580-662 0XXX3XXX4XXX5XXX6XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 RINGLING OK
— 580-664 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 BUTLER OK
— 580-666 0XXX3XXX4XXX6XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ROCKY 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.