NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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
— 360-546 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-547 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 MARYSVILLE WA
— 360-548 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 MARYSVILLE WA
— 360-549 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SHELTON WA
— 360-551 4XXX which blocks → T-MOBILE USA, INC. 6529 SILVERDALE WA
— 360-552 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELFAIR WA
— 360-554 2XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PTTOWNSEND WA
— 360-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST WA
— 360-557 2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 CHEHALIS WA
— 360-560 4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LONGVIEW WA
— 360-561 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 OLYMPIA WA
— 360-563 none assigned yet which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 SNOHOMISH WA
— 360-565 4XXX5XXX6XXX · 2 holders which blocks → QWEST CORPORATION 9638 PT ANGELES WA
— 360-566 2XXX3XXX5XXX6XXX7XXX · 4 holders which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-567 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 VANCOUVER WA
— 360-568 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 SNOHOMISH WA
— 360-569 1XXX3XXX4XXX5XXX7XXX9XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 ASHFORD WA
— 360-570 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-571 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-573 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-574 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-575 not yet reported which blocks → QWEST CORPORATION 9638 LONGVIEW WA
— 360-576 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-577 not yet reported which blocks → QWEST CORPORATION 9638 LONGVIEW WA
— 360-578 not yet reported which blocks → QWEST CORPORATION 9638 LONGVIEW WA
— 360-579 none assigned yet which blocks → WHIDBEY TEL. CO. 2452 SO WHIDBEY WA
— 360-580 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 ABERDEEN WA
— 360-581 7XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 ABERDEEN WA
— 360-582 4XXX6XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9638 PT ANGELES WA
— 360-586 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-587 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SKYKOMISH WA
— 360-588 2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 MT VERNON WA
— 360-589 0XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 ABERDEEN WA
— 360-590 8XXX9XXX which blocks → UNITED STATES CELLULAR - WA 6270 ABERDEEN WA
— 360-591 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → UNITED STATES CELLULAR - WA 6270 ABERDEEN WA
— 360-592 3XXX6XXX7XXX8XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 WHATCOMCTY WA
— 360-594 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 WHATCOMCTY WA
— 360-595 3XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 WHATCOMCTY WA
— 360-596 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-598 0XXX which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 POULSBO WA
— 360-599 0XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 WHATCOMCTY WA
— 360-600 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 VANCOUVER WA
— 360-601 3XXX4XXX5XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 VANCOUVER WA
— 360-603 0XXX1XXX2XXX3XXX6XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 WHATCOMCTY WA
— 360-604 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-606 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 VANCOUVER WA
— 360-607 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 VANCOUVER WA
— 360-608 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 VANCOUVER WA
— 360-609 6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 VANCOUVER WA
— 360-610 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MT VERNON WA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.