NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

1 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, last 30 days — NPA 509
NEW CINGULAR WIRELESS PCS, LLC 1
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
— 509-439 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SUNNYSIDE WA
— 509-441 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-442 none assigned yet which blocks → PEND OREILLE TELEPHONE COMPANY 2418 IONE WA
— 509-443 3XXX4XXX5XXX which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-444 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPOKANE WA
— 509-445 0XXX1XXX2XXX3XXX4XXX5XXX · 3 holders which blocks → PEND OREILLE TELEPHONE COMPANY 2418 CUSICK WA
— 509-446 none assigned yet which blocks → PEND OREILLE TELEPHONE COMPANY 2418 METALINFLS WA
— 509-447 none assigned yet which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 NEWPORT WA
— 509-448 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-449 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 BRIDGEPORT WA
— 509-451 not yet reported which blocks → QWEST CORPORATION 9638 YAKIMA WA
— 509-452 not yet reported which blocks → QWEST CORPORATION 9638 YAKIMA WA
— 509-453 not yet reported which blocks → QWEST CORPORATION 9638 YAKIMA WA
— 509-454 not yet reported which blocks → QWEST CORPORATION 9638 YAKIMA WA
— 509-455 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-456 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-457 not yet reported which blocks → QWEST CORPORATION 9638 YAKIMA WA
— 509-458 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-459 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-461 not yet reported which blocks → ONVOY, LLC - WA 483E SPOKANE WA
— 509-462 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPOKANE WA
— 509-463 not yet reported which blocks → ONVOY, LLC - WA 483E SPOKANE WA
— 509-464 6XXX7XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-465 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-466 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-467 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-468 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-469 not yet reported which blocks → QWEST CORPORATION 9638 YAKIMA WA
— 509-470 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 WENATCHEE WA
— 509-471 not yet reported which blocks → ONVOY, LLC - WA 483E SPOKANE WA
— 509-472 not yet reported which blocks → ONVOY, LLC - WA 483E SPOKANE WA
— 509-473 0XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-474 0XXX1XXX9XXX which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-475 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
— 509-476 7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9638 OROVILLE WA
— 509-477 9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPOKANE WA
— 509-478 0XXX1XXX2XXX7XXX8XXX9XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 ROSALIA WA
— 509-479 not yet reported which blocks → ONVOY, LLC - WA 483E SPOKANE WA
— 509-482 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-483 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-484 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-485 0XXX1XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 MOLSON WA
— 509-486 3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 TONASKET WA
— 509-487 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-488 not yet reported which blocks → QWEST CORPORATION 9638 OTHELLO WA
— 509-489 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-490 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 YAKIMA WA
— 509-492 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PASCO WA
— 509-493 7XXX which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 WH SALMON WA
— 509-494 2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9638 YAKIMA 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.