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
— 360-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 360-612 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ABERDEEN WA
— 360-613 not yet reported which blocks → QWEST CORPORATION 9638 SILVERDALE WA
— 360-614 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 HOODSPORT WA
— 360-615 2XXX3XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ENUMCLAW WA
— 360-616 1XXX3XXX6XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BREMERTON WA
— 360-617 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 WHATCOMCTY WA
— 360-618 1XXX2XXX3XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 MARYSVILLE WA
— 360-619 2XXX8XXX which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-620 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SILVERDALE WA
— 360-621 7XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SILVERDALE WA
— 360-623 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → RAINIER CONNECT, INC. - WA 7720 CENTRALIA WA
— 360-624 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 VANCOUVER WA
— 360-625 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 ENUMCLAW WA
— 360-626 1XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → ONVOY, LLC - WA 483E POULSBO WA
— 360-627 0–9 XXXall 10 · 3 holders which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-629 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 MARYSVILLE WA
— 360-630 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 MT VERNON WA
— 360-631 3XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 MARYSVILLE WA
— 360-633 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SILVERDALE WA
— 360-635 1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 VANCOUVER WA
— 360-636 not yet reported which blocks → QWEST CORPORATION 9638 LONGVIEW WA
— 360-637 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ABERDEEN WA
— 360-638 3XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 KINGSTON WA
— 360-639 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 OAK HARBOR WA
— 360-640 5XXX7XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 FORKS WA
— 360-642 not yet reported which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 LONG BEACH WA
— 360-643 2XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 PTTOWNSEND WA
— 360-645 none assigned yet which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 FORKS WA
— 360-646 2XXX3XXX8XXX which blocks → ONVOY, LLC - WA 483E MORTON WA
— 360-647 not yet reported which blocks → QWEST CORPORATION 9638 WHATCOMCTY WA
— 360-648 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 OCOSTA WA
— 360-649 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SILVERDALE WA
— 360-650 not yet reported which blocks → QWEST CORPORATION 9638 WHATCOMCTY WA
— 360-651 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 MARYSVILLE WA
— 360-652 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 MARYSVILLE WA
— 360-653 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 MARYSVILLE WA
— 360-654 4XXX5XXX6XXX7XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 MARYSVILLE WA
— 360-655 0XXX4XXX5XXX7XXX · 4 holders which blocks → ONVOY, LLC - WA 483E EATONVILLE WA
— 360-656 4XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 WHATCOMCTY WA
— 360-657 8XXX9XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 MARYSVILLE WA
— 360-658 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 MARYSVILLE WA
— 360-659 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 MARYSVILLE WA
— 360-661 8XXX9XXX which blocks → METROPCS, INC. 5562 MT VERNON WA
— 360-662 3XXX6XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9638 SILVERDALE WA
— 360-663 4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → QWEST CORPORATION 9638 CRYSTAL MT WA
— 360-664 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-665 7XXX8XXX which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 LONG BEACH WA
— 360-666 not yet reported which blocks → QWEST CORPORATION 9638 BATTLEGRND WA
— 360-667 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9638 BATTLEGRND 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.