NumberResearch Membership · Data 10/01/2026

Recent prefix assignments

374 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 10/01/2026

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 Oct 2026 Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 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
— 509-495 1XXX which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-496 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SPOKANE WA
— 509-498 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 CHENEY WA
— 509-499 8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SPOKANE WA
— 509-500 0XXX2XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ASOTIN WA
— 509-507 0–9 XXXall 10 · 2 holders which blocks → CALLWORKS CORPORATION 475J DEER PARK WA
— 509-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 509-518 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H KENNEWICK WA
— 509-520 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 WALLAWALLA WA
— 509-521 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PASCO WA
— 509-522 not yet reported which blocks → QWEST CORPORATION 9638 WALLAWALLA WA
— 509-523 0XXX7XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 ROSALIA WA
— 509-524 3XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9638 WALLAWALLA WA
— 509-525 not yet reported which blocks → QWEST CORPORATION 9638 WALLAWALLA WA
— 509-526 not yet reported which blocks → QWEST CORPORATION 9638 WALLAWALLA WA
— 509-527 not yet reported which blocks → QWEST CORPORATION 9638 WALLAWALLA WA
— 509-528 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PASCO WA
— 509-529 not yet reported which blocks → QWEST CORPORATION 9638 WALLAWALLA WA
— 509-531 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PASCO WA
— 509-532 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-533 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-534 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-535 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-536 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-538 5XXX7XXX9XXX · 3 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 WILLARD WA
— 509-539 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PASCO WA
— 509-540 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 WALLAWALLA WA
— 509-542 5XXX6XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9638 PASCO WA
— 509-543 not yet reported which blocks → QWEST CORPORATION 9638 PASCO WA
— 509-544 not yet reported which blocks → QWEST CORPORATION 9638 PASCO WA
— 509-545 not yet reported which blocks → QWEST CORPORATION 9638 PASCO WA
— 509-546 none assigned yet which blocks → QWEST CORPORATION 9638 PASCO WA
— 509-547 not yet reported which blocks → QWEST CORPORATION 9638 PASCO WA
— 509-548 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 WENATCHEE WA
— 509-549 none assigned yet which blocks → PIONEER TEL. CO. 2437 LACROSSE WA
— 509-550 0XXX1XXX2XXX3XXX5XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 NEWPORT WA
— 509-552 0XXX2XXX4XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 CLARKSTON WA
— 509-553 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 COLFAX WA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 10/01/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.