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
— 360-433 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 VANCOUVER WA
— 360-434 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SILVERDALE WA
— 360-435 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 MARYSVILLE WA
— 360-436 3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 MARYSVILLE WA
— 360-437 3XXX6XXX · 2 holders which blocks → QWEST CORPORATION 9638 PORTLUDLOW WA
— 360-438 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-439 not yet reported which blocks → SPOK, INC. 6630 LONGVIEW WA
— 360-441 3XXX4XXX6XXX8XXX which blocks → T-MOBILE USA, INC. 6529 WHATCOMCTY WA
— 360-442 0XXX1XXX3XXX4XXX6XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9638 LONGVIEW WA
— 360-443 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PORT ORCH WA
— 360-444 not yet reported which blocks → HAT ISLAND TEL. CO. 2417 HAT ISLAND WA
— 360-445 0XXX1XXX7XXX8XXX9XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 MT VERNON WA
— 360-446 not yet reported which blocks → YCOM NETWORKS, INC. 2453 YELM WA
— 360-447 1XXX2XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SILVERDALE WA
— 360-448 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 VANCOUVER WA
— 360-449 2XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-451 none assigned yet which blocks → T-MOBILE USA, INC. 6529 OLYMPIA WA
— 360-452 not yet reported which blocks → QWEST CORPORATION 9638 PT ANGELES WA
— 360-453 2XXX3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H SNOHOMISH WA
— 360-454 0–9 XXXall 10 · 6 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 MARYSVILLE WA
— 360-455 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-456 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-457 not yet reported which blocks → QWEST CORPORATION 9638 PT ANGELES WA
— 360-458 not yet reported which blocks → YCOM NETWORKS, INC. 2453 YELM WA
— 360-459 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-460 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 PT ANGELES WA
— 360-461 5XXX6XXX7XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 PT ANGELES WA
— 360-462 7XXX which blocks → HOOD CANAL TELCO, INC. DBA HOOD CANAL COMM - WA 0403 SHELTON WA
— 360-463 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SHELTON WA
— 360-464 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 OLYMPIA WA
— 360-465 3XXX which blocks → WESTERN WAHKIAKUM COUNTY TEL. CO. 2451 GRAYSRIVER WA
— 360-466 8XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 MT VERNON WA
— 360-467 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SNOHOMISH WA
— 360-468 0XXX1XXX5XXX7XXX8XXX · 2 holders which blocks → CENTURYTEL OF INTER-ISLAND, INC. DBA CENTURYLINK 2422 SAN JUAN WA
— 360-469 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - WA 483E BLACKDIMND WA
— 360-470 4XXX5XXX7XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 ELMA WA
— 360-471 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BREMERTON WA
— 360-473 3XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-474 2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 MARYSVILLE WA
— 360-475 not yet reported which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-476 not yet reported which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-477 2XXX3XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 PT ANGELES WA
— 360-478 not yet reported which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-479 not yet reported which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-480 5XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 OLYMPIA WA
— 360-481 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 OLYMPIA WA
— 360-482 not yet reported which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 ELMA WA
— 360-483 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 WHATCOMCTY WA
— 360-484 6XXX which blocks → WESTERN WAHKIAKUM COUNTY TEL. CO. 2451 NASELLE WA
— 360-485 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 OLYMPIA 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.