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
2017-08-10 580-970 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ALTUS 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
2017-06-23 580-853 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DURANT OK
2017-03-14 580-860 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H DUNCAN OK
2017-02-02 580-967 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 ADA OK
2016-12-19 580-769 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA OK - LLC 530C SAYRE 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
2016-03-30 580-495 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ADA OK
2016-01-27 580-954 0–9 XXXall 10 · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA OK - LLC 530C ALTUS 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
2015-06-17 580-553 not yet reported which blocks → PANHANDLE TELECOMMUNICATIONS SYSTEMS, INC. 468B LAVERNE OK
2014-12-15 580-969 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HUGO OK
2014-10-01 580-454 not yet reported which blocks → WICHITA ONLINE, INC. - OK 258F ELGIN OK
2014-10-01 580-598 not yet reported which blocks → WICHITA ONLINE, INC. - OK 258F FLETCHER OK
2014-10-01 580-717 not yet reported which blocks → WICHITA ONLINE, INC. - OK 258F ROOSEVELT OK
2014-10-01 580-957 not yet reported which blocks → WICHITA ONLINE, INC. - OK 258F CYRIL OK
2014-10-01 580-966 not yet reported which blocks → WICHITA ONLINE, INC. - OK 258F MT VIEW OK
2014-09-25 580-315 not yet reported which blocks → WICHITA ONLINE, INC. - OK 258F STERLING OK
2014-07-25 580-290 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 WOODWARD OK
2014-07-24 580-308 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - OK 119F TONKAWA OK
2014-05-14 580-722 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 NEWKIRK OK
2014-02-27 580-755 0XXX1XXX5XXX7XXX8XXX · 5 holders which blocks → UNITED STATES CELLULAR - OK 6272 RANDLETT OK
2013-12-23 580-447 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ADA OK
2013-11-01 580-297 0–9 XXXall 10 · 4 holders which blocks → CSC VOICE, LLC 612K ENID OK
2013-04-23 580-500 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 CLINTON OK
2012-06-22 580-665 0–9 XXXall 10 · 4 holders which blocks → UNITED STATES CELLULAR - OK 6272 ADA OK
2012-03-30 580-951 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 LAWTON OK
2011-11-22 580-291 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 LAWTON OK
2011-11-22 580-956 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 LAWTON OK
2011-09-12 580-952 0–9 XXXall 10 · 3 holders which blocks → AT&T ENTERPRISES, LLC 516C HITCHCOCK OK
2011-08-29 580-433 not yet reported which blocks → CROSS-VALLIANT CELLULAR PARTNERSHIP 387E VALLIANT OK
2011-08-29 580-728 not yet reported which blocks → CROSS-VALLIANT CELLULAR PARTNERSHIP 387E IDABEL OK
2011-04-20 580-350 0–9 XXXall 10 · 6 holders which blocks → WICHITA ONLINE, INC. - OK 258F LAWTON OK
2011-04-06 580-693 0XXX2XXX3XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 COMANCHE OK
2011-03-28 580-321 not yet reported which blocks → CROSS-VALLIANT CELLULAR PARTNERSHIP 387E RATTAN OK
2011-03-28 580-424 not yet reported which blocks → CROSS-VALLIANT CELLULAR PARTNERSHIP 387E HUGO OK
2011-03-28 580-955 not yet reported which blocks → CROSS-VALLIANT CELLULAR PARTNERSHIP 387E ANTLERS OK
2011-03-28 580-964 not yet reported which blocks → CROSS-VALLIANT CELLULAR PARTNERSHIP 387E FORTTOWSON OK
2010-06-21 580-312 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PINE TELEPHONE COMPANY DBA PINE CELL PHONES, INC. 235C BROKEN BOW OK
2009-12-14 580-453 0–9 XXXall 10 · 8 holders which blocks → AT&T ENTERPRISES, LLC 516C ADA OK
2009-02-06 580-558 0–9 XXXwhole prefix which blocks → SOUTHWESTERN BELL 9533 LAWTON OK
2009-01-26 580-699 0–9 XXXall 10 · 2 holders which blocks → FIDELITY CABLEVISION, LLC 302F LAWTON OK
2008-08-14 580-616 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 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.