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 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
— 425-629 0XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 KIRKLAND WA
— 425-631 not yet reported which blocks → SPOK, INC. 6630 BELLEVUE WA
— 425-632 not yet reported which blocks → WA
— 425-635 8XXX which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-636 3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 KIRKLAND WA
— 425-637 not yet reported which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-638 2XXX3XXX9XXX which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-640 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 HALLS LAKE WA
— 425-641 not yet reported which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-642 9XXX which blocks → ONVOY, LLC - WA 483E ISSAQUAH WA
— 425-643 not yet reported which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-644 not yet reported which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-645 9XXX which blocks → ONVOY, LLC - WA 483E EVERETT WA
— 425-646 not yet reported which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-647 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 BELLEVUE WA
— 425-648 9XXX which blocks → ONVOY, LLC - WA 483E HALLS LAKE WA
— 425-649 not yet reported which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-650 not yet reported which blocks → ONVOY, LLC - WA 483E KIRKLAND WA
— 425-651 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ISSAQUAH WA
— 425-652 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-653 not yet reported which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-656 not yet reported which blocks → QWEST CORPORATION 9638 RENTON WA
— 425-657 0XXX3XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 ISSAQUAH WA
— 425-658 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - WA 483E KIRKLAND WA
— 425-660 0XXX1XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 MAPLE VLY WA
— 425-663 0XXX1XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 RENTON WA
— 425-669 0XXX1XXX9XXX · 2 holders which blocks → ONVOY, LLC - WA 483E SILVERLAKE WA
— 425-670 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 HALLS LAKE WA
— 425-671 not yet reported which blocks → ONVOY, LLC - WA 483E BELLEVUE WA
— 425-672 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 HALLS LAKE WA
— 425-673 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 HALLS LAKE WA
— 425-675 not yet reported which blocks → ONVOY, LLC - WA 483E BELLEVUE WA
— 425-677 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 ISSAQUAH WA
— 425-678 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 HALLS LAKE WA
— 425-679 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 BELLEVUE WA
— 425-681 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 BELLEVUE WA
— 425-686 0XXX2XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 BOTHELL WA
— 425-687 not yet reported which blocks → QWEST CORPORATION 9638 RENTON WA
— 425-688 not yet reported which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-691 0XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 BELLEVUE WA
— 425-696 not yet reported which blocks → ONVOY, LLC - WA 483E BELLEVUE WA
— 425-697 0XXX1XXX9XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 HALLS LAKE WA
— 425-698 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 BELLEVUE WA
— 425-699 not yet reported which blocks → ONVOY, LLC - WA 483E BELLEVUE WA
— 425-700 not yet reported which blocks → WA
— 425-702 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-704 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-709 not yet reported which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-710 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX 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.