NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

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

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
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
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
— 580-328 not yet reported which blocks → DOBSON TEL. CO. 1988 TALOGA OK
— 580-329 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → ONVOY, LLC - OK 409F CARRIER OK
— 580-330 1XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WEATHERFD OK
— 580-331 0XXX4XXX5XXX6XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 CLINTON OK
— 580-332 not yet reported which blocks → SOUTHWESTERN BELL 9533 ADA OK
— 580-333 3XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 COMANCHE OK
— 580-334 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 WOODWARD OK
— 580-335 none assigned yet which blocks → PIONEER TEL. COOP., INC. 2018 FREDERICK OK
— 580-336 6XXX which blocks → SOUTHWESTERN BELL 9533 PERRY OK
— 580-337 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 BESSIE OK
— 580-338 not yet reported which blocks → PANHANDLE TELEPHONE COOPERATIVE, INC. 2016 GUYMON OK
— 580-340 2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 ARDMORE OK
— 580-341 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ARDMORE OK
— 580-342 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 TEMPLE OK
— 580-343 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 CORN OK
— 580-345 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 SOPER 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
— 580-349 not yet reported which blocks → PANHANDLE TELEPHONE COOPERATIVE, INC. 2016 GOODWELL OK
— 580-351 2XXX which blocks → SOUTHWESTERN BELL 9533 LAWTON OK
— 580-353 9XXX which blocks → SOUTHWESTERN BELL 9533 LAWTON OK
— 580-354 2XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 LAWTON OK
— 580-355 not yet reported which blocks → SOUTHWESTERN BELL 9533 LAWTON OK
— 580-357 not yet reported which blocks → SOUTHWESTERN BELL 9533 LAWTON OK
— 580-358 0XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → ONVOY, LLC - OK 409F FAIRMONT OK
— 580-361 not yet reported which blocks → PANHANDLE TELEPHONE COOPERATIVE, INC. 2016 BRYANS COR OK
— 580-362 0XXX4XXX6XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 NEWKIRK OK
— 580-363 not yet reported which blocks → SOUTHWESTERN BELL 9533 BLACKWELL OK
— 580-364 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ATOKA OK
— 580-365 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 STERLING OK
— 580-367 3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 CADDO OK
— 580-369 4XXX which blocks → SOUTHWESTERN BELL 9533 DAVIS OK
— 580-370 6XXX7XXX8XXX9XXX · 3 holders which blocks → METROPCS, INC. 5562 PERRY OK
— 580-371 7XXX8XXX which blocks → SOUTHWESTERN BELL 9533 TISHOMINGO OK
— 580-374 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 ELK CITY OK
— 580-375 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 WEATHERFD OK
— 580-379 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → SOUTHWESTERN BELL 9533 ALTUS OK
— 580-382 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OK 7258 PONCA CITY OK
— 580-383 0XXX1XXX2XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → TELNYX LLC 073H CLINTON OK
— 580-384 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 MILL CREEK OK
— 580-385 not yet reported which blocks → KANOKLA TEL ASSN 1788 BRAMAN OK
— 580-386 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - OK 409F DAVIS OK
— 580-388 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 LAMONT OK
— 580-389 not yet reported which blocks → CHICKASAW TEL. CO. 1980 ARDMRAIRPK OK
— 580-393 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 SENTINEL OK
— 580-394 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → ONVOY, LLC - OK 409F GLENCOE OK
— 580-395 0XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 MEDFORD OK
— 580-396 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → ONVOY, LLC - OK 409F MORRISON OK
— 580-397 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 MANITOU OK
— 580-398 not yet reported which blocks → SPOK, INC. 6630 ELK CITY OK

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.