NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

1 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, 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
Clear Download CSV ↓
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 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.