NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 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, all time — NPA 580
WINDSTREAM OKLAHOMA, INC. 37
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
2018-06-29 580-901 0XXX9XXX · 2 holders which blocks → WINDSTREAM OKLAHOMA, INC. 1965 CANUTE OK
2017-07-06 580-459 0XXX9XXX · 2 holders which blocks → WINDSTREAM OKLAHOMA, INC. 1965 MILBURN OK
2017-07-05 580-809 0XXX7XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM OKLAHOMA, INC. 1965 SMITHVILLE OK
2016-07-27 580-972 0XXX9XXX · 2 holders which blocks → WINDSTREAM OKLAHOMA, INC. 1965 STERLING OK
2016-07-13 580-671 0XXX6XXX9XXX · 3 holders which blocks → WINDSTREAM OKLAHOMA, INC. 1965 MT VIEW OK
2016-07-13 580-961 0XXX1XXX6XXX9XXX · 4 holders which blocks → WINDSTREAM OKLAHOMA, INC. 1965 STRINGTOWN OK
2016-07-13 580-962 9XXX which blocks → WINDSTREAM OKLAHOMA, INC. 1965 BURNS FLAT OK
2016-06-28 580-905 0XXX9XXX · 2 holders which blocks → WINDSTREAM OKLAHOMA, INC. 1965 MILL CREEK OK
2016-06-28 580-960 0XXX9XXX · 2 holders which blocks → WINDSTREAM OKLAHOMA, INC. 1965 CORN OK
2015-06-19 580-270 0XXX9XXX · 2 holders which blocks → WINDSTREAM OKLAHOMA, INC. 1965 VELMA OK
2015-06-19 580-971 0XXX6XXX9XXX · 3 holders which blocks → WINDSTREAM OKLAHOMA, INC. 1965 SNYDER OK
— 580-241 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 BATTIEST OK
— 580-244 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 SMITHVILLE OK
— 580-343 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 CORN OK
— 580-346 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 STRINGTOWN OK
— 580-347 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 MT VIEW OK
— 580-365 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 STERLING OK
— 580-384 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 MILL CREEK OK
— 580-428 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 CLARITA OK
— 580-432 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 ELMOREWEST OK
— 580-441 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WINDSTREAM OKLAHOMA, INC. 1965 ELMORECITY 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
— 580-472 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 CANUTE OK
— 580-473 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 HAMMON OK
— 580-538 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 GOTEBO OK
— 580-562 5XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM OKLAHOMA, INC. 1965 BURNS FLAT OK
— 580-569 7XXX8XXX · 2 holders which blocks → WINDSTREAM OKLAHOMA, INC. 1965 SNYDER OK
— 580-592 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 FOSS OK
— 580-639 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 ROOSEVELT OK
— 580-664 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 BUTLER OK
— 580-673 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 PIKE CITY OK
— 580-674 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 DILL CITY OK
— 580-788 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 ELMORECITY OK
— 580-836 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 CONNERVL OK
— 580-856 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 RATLIFF CY OK
— 580-892 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 GERTY 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.