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
— 360-324 0XXX2XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHEHALIS WA
— 360-325 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 WHATCOMCTY WA
— 360-326 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 VANCOUVER WA
— 360-327 7XXX8XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 FORKS WA
— 360-329 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 PORT ORCH WA
— 360-330 4XXX which blocks → QWEST CORPORATION 9638 CENTRALIA WA
— 360-331 none assigned yet which blocks → WHIDBEY TEL. CO. 2452 SO WHIDBEY WA
— 360-332 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 WHATCOMCTY WA
— 360-333 3XXX4XXX5XXX6XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 MT VERNON WA
— 360-335 2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 CAMAS WA
— 360-336 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 MT VERNON WA
— 360-337 0XXX9XXX which blocks → QWEST CORPORATION 9638 SILVERDALE WA
— 360-339 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 OLYMPIA WA
— 360-340 8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SILVERDALE WA
— 360-341 none assigned yet which blocks → WHIDBEY TEL. CO. 2452 SO WHIDBEY WA
— 360-342 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 BATTLEGRND WA
— 360-343 none assigned yet which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 PORTLUDLOW WA
— 360-344 2XXX5XXX6XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9638 PTTOWNSEND WA
— 360-345 3XXX which blocks → RAINIER CONNECT, INC. - WA 7720 CHEHALIS WA
— 360-347 1XXX2XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 ROCHESTER WA
— 360-348 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNOHOMISH WA
— 360-349 none assigned yet which blocks → T-MOBILE USA, INC. 6529 OLYMPIA WA
— 360-350 0XXX2XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 OLYMPIA WA
— 360-351 4XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 PT ANGELES WA
— 360-352 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-353 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 LONGVIEW WA
— 360-354 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 WHATCOMCTY WA
— 360-355 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 LONGVIEW WA
— 360-356 0XXX1XXX2XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 VANCOUVER WA
— 360-357 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-358 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SHELTON WA
— 360-359 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 OLYMPIA WA
— 360-361 8XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SKYKOMISH WA
— 360-362 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BREMERTON WA
— 360-363 0XXX4XXX8XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 MARYSVILLE WA
— 360-364 5XXX which blocks → ONVOY, LLC - WA 483E STEVESPASS WA
— 360-365 5XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SNOHOMISH WA
— 360-366 6XXX8XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 WHATCOMCTY WA
— 360-368 3XXX4XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 WINLOCK WA
— 360-369 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CORETEL WASHINGTON, INC. - WA 453J BATTLEGRND WA
— 360-370 1XXX2XXX3XXX4XXX6XXX8XXX · 3 holders which blocks → CENTURYTEL OF INTER-ISLAND, INC. DBA CENTURYLINK 2422 SAN JUAN WA
— 360-371 6XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 WHATCOMCTY WA
— 360-372 none assigned yet which blocks → INLAND TEL CO 2423 DEWATTO WA
— 360-373 not yet reported which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-374 not yet reported which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 FORKS WA
— 360-375 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → CENTURYTEL OF INTER-ISLAND, INC. DBA CENTURYLINK 2422 SAN JUAN WA
— 360-376 0XXX which blocks → CENTURYTEL OF INTER-ISLAND, INC. DBA CENTURYLINK 2422 SAN JUAN WA
— 360-377 not yet reported which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-378 not yet reported which blocks → CENTURYTEL OF INTER-ISLAND, INC. DBA CENTURYLINK 2422 SAN JUAN WA
— 360-379 not yet reported which blocks → QWEST CORPORATION 9638 PTTOWNSEND 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.