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 360
QWEST CORPORATION 170
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 82
ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 81
T-MOBILE USA, INC. 66
LEVEL 3 COMMUNICATIONS, LLC - WA 61
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
— 360-486 4XXX which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-488 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 MT VERNON WA
— 360-490 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SHELTON WA
— 360-491 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-492 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 MORTON WA
— 360-493 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-494 1XXX9XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 MORTON WA
— 360-495 1XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 ELMA WA
— 360-496 1XXX4XXX8XXX which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 MORTON WA
— 360-497 none assigned yet which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 MORTON WA
— 360-498 1XXX7XXX8XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 MORTON WA
— 360-499 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 OAK HARBOR WA
— 360-501 not yet reported which blocks → QWEST CORPORATION 9638 LONGVIEW WA
— 360-502 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 MARYSVILLE WA
— 360-503 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 MT VERNON WA
— 360-504 2XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PT ANGELES WA
— 360-507 8XXX9XXX · 2 holders which blocks → METROPCS, INC. 5562 OLYMPIA WA
— 360-508 2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → METROPCS, INC. 5562 CENTRALIA WA
— 360-509 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SILVERDALE WA
— 360-510 4XXX5XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 WHATCOMCTY WA
— 360-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 360-512 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SNOHOMISH WA
— 360-513 not yet reported which blocks → T-MOBILE USA, INC. 6529 VANCOUVER WA
— 360-514 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-515 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 OLYMPIA WA
— 360-516 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SILVERDALE WA
— 360-518 9XXX which blocks → T-MOBILE USA, INC. 6529 VANCOUVER WA
— 360-519 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORT ORCH WA
— 360-520 8XXX which blocks → UNITED STATES CELLULAR - WA 6270 CHEHALIS WA
— 360-521 2XXX which blocks → T-MOBILE USA, INC. 6529 VANCOUVER WA
— 360-523 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 CENTRALIA WA
— 360-525 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 BREMERTON WA
— 360-526 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WHATCOMCTY WA
— 360-527 5XXX6XXX which blocks → QWEST CORPORATION 9638 WHATCOMCTY WA
— 360-528 0XXX1XXX7XXX9XXX which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 OLYMPIA WA
— 360-529 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 OLYMPIA WA
— 360-530 0XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 MARYSVILLE WA
— 360-531 4XXX6XXX7XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PTTOWNSEND WA
— 360-532 not yet reported which blocks → QWEST CORPORATION 9638 ABERDEEN WA
— 360-533 not yet reported which blocks → QWEST CORPORATION 9638 ABERDEEN WA
— 360-534 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-535 0XXX1XXX2XXX3XXX4XXX7XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SILVERDALE WA
— 360-536 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SILVERDALE WA
— 360-537 not yet reported which blocks → QWEST CORPORATION 9638 ABERDEEN WA
— 360-538 not yet reported which blocks → QWEST CORPORATION 9638 ABERDEEN WA
— 360-539 3XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 OLYMPIA WA
— 360-540 not yet reported which blocks → T-MOBILE USA, INC. 6529 MT VERNON WA
— 360-542 0XXX4XXX6XXX · 3 holders which blocks → SKYE TELECOM LLC DBA SKYETEL 622J MT VERNON WA
— 360-543 1XXX2XXX3XXX4XXX6XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 WHATCOMCTY WA
— 360-544 0XXX2XXX3XXX4XXX6XXX7XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 OAK HARBOR WA

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.