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 425
ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 122
T-MOBILE USA, INC. 91
QWEST CORPORATION 69
LEVEL 3 COMMUNICATIONS, LLC - WA 49
NEW CINGULAR WIRELESS PCS, LLC 44
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 425-419 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 BOTHELL WA
— 425-420 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 BOTHELL WA
— 425-421 0–9 XXXwhole prefix which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
— 425-422 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 EVERETT WA
— 425-423 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-424 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 BOTHELL WA
— 425-427 not yet reported which blocks → QWEST CORPORATION 9638 ISSAQUAH WA
— 425-430 not yet reported which blocks → QWEST CORPORATION 9638 RENTON WA
— 425-432 not yet reported which blocks → QWEST CORPORATION 9638 MAPLE VLY WA
— 425-433 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9638 MAPLE VLY WA
— 425-434 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 SNOQUMPASS WA
— 425-437 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 MAPLE VLY WA
— 425-438 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-442 not yet reported which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-443 4XXX which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-444 not yet reported which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-445 4XXX which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-446 0XXX1XXX2XXX3XXX9XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-448 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WA 483E KIRKLAND WA
— 425-450 not yet reported which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-451 not yet reported which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-452 not yet reported which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-453 not yet reported which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-454 not yet reported which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-455 not yet reported which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-456 not yet reported which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-458 8XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
— 425-462 not yet reported which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-466 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 BELLEVUE WA
— 425-467 not yet reported which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-468 not yet reported which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-471 6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 BOTHELL WA
— 425-478 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 HALLS LAKE WA
— 425-481 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 BOTHELL WA
— 425-482 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 BOTHELL WA
— 425-483 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 BOTHELL WA
— 425-484 9XXX which blocks → ONVOY, LLC - WA 483E BELLEVUE WA
— 425-485 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 BOTHELL WA
— 425-486 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 BOTHELL WA
— 425-487 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 BOTHELL WA
— 425-488 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 BOTHELL WA
— 425-489 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 BOTHELL WA
— 425-491 0XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BOTHELL WA
— 425-492 0XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOTHELL WA
— 425-493 3XXX4XXX5XXX7XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-495 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 BELLEVUE WA
— 425-496 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 RENTON WA
— 425-497 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-498 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-501 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 EVERETT 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.