NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

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

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, last 30 days
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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
— 425-356 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-357 2XXX7XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 SILVERLAKE WA
— 425-359 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 EVERETT WA
— 425-360 not yet reported which blocks → WA
— 425-368 3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 BOTHELL WA
— 425-369 4XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9638 ISSAQUAH WA
— 425-372 6XXX7XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 BELLEVUE WA
— 425-373 6XXX which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-376 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-377 3XXX4XXX5XXX6XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-378 not yet reported which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-379 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 SILVERLAKE WA
— 425-381 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BOTHELL WA
— 425-385 0XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 SILVERLAKE WA
— 425-387 2XXX3XXX4XXX7XXX8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 EVERETT WA
— 425-388 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-390 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 RENTON WA
— 425-391 not yet reported which blocks → QWEST CORPORATION 9638 ISSAQUAH WA
— 425-392 not yet reported which blocks → QWEST CORPORATION 9638 ISSAQUAH WA
— 425-393 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 BELLEVUE WA
— 425-394 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9638 ISSAQUAH WA
— 425-396 9XXX which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 NORTH BEND WA
— 425-397 1XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-398 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 BOTHELL WA
— 425-399 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WA 483E SILVERLAKE WA
— 425-401 not yet reported which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-402 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 BOTHELL WA
— 425-405 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 EVERETT WA
— 425-406 0XXX2XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J KIRKLAND WA
— 425-407 2XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-409 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 HALLS LAKE WA
— 425-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 425-412 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 HALLS LAKE WA
— 425-413 not yet reported which blocks → QWEST CORPORATION 9638 MAPLE VLY WA
— 425-415 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 BOTHELL WA
— 425-416 0XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ISSAQUAH WA
— 425-417 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 BELLEVUE WA
— 425-418 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 EVERETT WA
— 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

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.