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
— 580-873 0XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 FORTTOWSON OK
— 580-874 0XXX3XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 KREMLIN OK
— 580-875 0XXX5XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 WALTERS OK
— 580-876 not yet reported which blocks → VALLIANT TEL. CO. 2032 RUFE OK
— 580-877 0XXX1XXX2XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 SOUTHMEADE OK
— 580-883 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 RINGWOOD OK
— 580-885 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 ARNETT OK
— 580-886 none assigned yet which blocks → PIONEER TEL. COOP., INC. 2018 CANTON OK
— 580-887 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 FAY OK
— 580-888 not yet reported which blocks → PANHANDLE TELEPHONE COOPERATIVE, INC. 2016 HARDESTY OK
— 580-889 none assigned yet which blocks → SOUTHWESTERN BELL 9533 ATOKA OK
— 580-891 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 OAKWOOD OK
— 580-892 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 GERTY OK
— 580-894 not yet reported which blocks → KANOKLA TEL ASSN 1788 SOUTHHAVEN OK
— 580-895 0XXX3XXX which blocks → PEERLESS NETWORK OF OKLAHOMA, LLC - OK 384H KONAWA OK
— 580-896 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - OK 409F COALGATE OK
— 580-897 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX OK
— 580-898 0XXX1XXX2XXX3XXX4XXX5XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA OK - LLC 530C DURANT OK
— 580-903 not yet reported which blocks → OK
— 580-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 580-916 8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 DURANT OK
— 580-918 not yet reported which blocks → OK
— 580-920 none assigned yet which blocks → SOUTHWESTERN BELL 9533 DURANT OK
— 580-921 not yet reported which blocks → PANHANDLE TELEPHONE COOPERATIVE, INC. 2016 LAVERNE OK
— 580-922 none assigned yet which blocks → PIONEER TEL. COOP., INC. 2018 SEILING OK
— 580-923 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 GAGE OK
— 580-924 not yet reported which blocks → SOUTHWESTERN BELL 9533 DURANT OK
— 580-925 0XXX5XXX6XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 KONAWA OK
— 580-926 not yet reported which blocks → DOBSON TEL. CO. 1988 CAMARGO OK
— 580-927 4XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 COALGATE OK
— 580-928 0XXX7XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 SAYRE OK
— 580-931 4XXX5XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 DURANT OK
— 580-933 none assigned yet which blocks → VALLIANT TEL. CO. 2032 VALLIANT OK
— 580-934 not yet reported which blocks → PANHANDLE TELEPHONE COOPERATIVE, INC. 2016 GATE OK
— 580-935 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 MARSHALL OK
— 580-937 5XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 WAPANUCKA OK
— 580-938 none assigned yet which blocks → PIONEER TEL. COOP., INC. 2018 SHATTUCK OK
— 580-939 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 HARMON OK
— 580-950 not yet reported which blocks → OK
— 580-953 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX OK
— 580-958 not yet reported which blocks → OK
— 580-959 not yet reported which blocks → OK
— 580-963 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 HASTINGS OK
— 580-965 not yet reported which blocks → CHEROKEE TEL. CO. 1979 CARTWRIGHT OK
— 580-968 not yet reported which blocks → KANOKLA TEL ASSN 1788 SOBLF CITY OK
— 580-976 not yet reported which blocks → OK
— 580-977 0XXX which blocks → SOUTHWESTERN BELL 9533 ENID OK
— 580-981 not yet reported which blocks → PINE TEL. CO. 2017 WRIGHTCITY OK
— 580-983 5XXX which blocks → DOBSON TEL. CO. 1988 ROGERMILLS OK
— 580-985 not yet reported which blocks → KANOKLA TEL ASSN 1788 SO WALDRON 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.