NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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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Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 580-504 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARDMORE OK
— 580-509 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → UNITED STATES CELLULAR - OK 6272 ATOKA OK
— 580-510 9XXX which blocks → SOUTHWESTERN BELL 9533 LAWTON OK
— 580-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 580-512 none assigned yet which blocks → UNITED STATES CELLULAR - OK 6272 LAWTON OK
— 580-513 9XXX which blocks → UNITED STATES CELLULAR - OK 6272 ATOKA OK
— 580-514 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → UNITED STATES CELLULAR - OK 6272 LAWTON OK
— 580-515 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CLINTON OK
— 580-526 not yet reported which blocks → DOBSON TEL. CO. 1988 ERICK OK
— 580-529 not yet reported which blocks → MEDICINE PARK TEL. CO. 2008 MEDICINEPK OK
— 580-531 not yet reported which blocks → SOUTHWESTERN BELL 9533 LAWTON OK
— 580-532 none assigned yet which blocks → PIONEER TEL. COOP., INC. 2018 POND CREEK OK
— 580-533 not yet reported which blocks → PANHANDLE TELEPHONE COOPERATIVE, INC. 2016 SO ENGLEWD OK
— 580-534 not yet reported which blocks → DOBSON TEL. CO. 1988 SWEETWATER OK
— 580-535 0XXX2XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 GRANITE OK
— 580-536 not yet reported which blocks → SOUTHWESTERN BELL 9533 LAWTON OK
— 580-537 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 LOCO OK
— 580-538 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 GOTEBO OK
— 580-540 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 ENID OK
— 580-541 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ENID OK
— 580-542 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ENID OK
— 580-543 not yet reported which blocks → PANHANDLE TELEPHONE COOPERATIVE, INC. 2016 GRIGGS OK
— 580-544 not yet reported which blocks → PANHANDLE TELEPHONE COOPERATIVE, INC. 2016 BOISE CITY OK
— 580-545 not yet reported which blocks → PANHANDLE TELEPHONE COOPERATIVE, INC. 2016 EVA OK
— 580-546 not yet reported which blocks → PANHANDLE TELEPHONE COOPERATIVE, INC. 2016 KEYES OK
— 580-547 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 CLINTON OK
— 580-548 none assigned yet which blocks → SOUTHWESTERN BELL 9533 ENID OK
— 580-549 3XXX which blocks → OKLAHOMA COMMUNICATION SYSTEM, INC. 1984 FLETCHER OK
— 580-550 2XXX3XXX6XXX7XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 WALTERS OK
— 580-554 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ENID OK
— 580-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST OK
— 580-561 not yet reported which blocks → CHICKASAW TEL. CO. 1980 WOODFORD OK
— 580-562 5XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM OKLAHOMA, INC. 1965 BURNS FLAT OK
— 580-563 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 BLAIR OK
— 580-564 6XXX which blocks → SOUTHWESTERN BELL 9533 KINGSTON OK
— 580-566 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → SOUTHWESTERN BELL 9533 BOSWELL OK
— 580-568 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 DAVIDSON OK
— 580-569 7XXX8XXX · 2 holders which blocks → WINDSTREAM OKLAHOMA, INC. 1965 SNYDER OK
— 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

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.