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 206
QWEST CORPORATION 243
T-MOBILE USA, INC. 95
ONVOY, LLC - WA 72
NEW CINGULAR WIRELESS PCS, LLC 58
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 57
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
— 206-645 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-650 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-651 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DES MOINES WA
— 206-652 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-653 4XXX5XXX6XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 DES MOINES WA
— 206-654 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-655 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SEATTLE WA
— 206-658 2XXX3XXX5XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-660 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-661 2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-662 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SEATTLE WA
— 206-663 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-664 1XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SEATTLE WA
— 206-666 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-667 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-669 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-673 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
— 206-674 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SEATTLE WA
— 206-675 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-676 2XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SEATTLE WA
— 206-678 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-679 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-680 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-681 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-682 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-683 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-684 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-685 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-686 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
— 206-687 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-689 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-691 8XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-692 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-696 7XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-697 3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-700 not yet reported which blocks → WA
— 206-701 4XXX6XXX7XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
— 206-703 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-706 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-708 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
— 206-709 5XXX6XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 206-713 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-714 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-715 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-716 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-718 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-719 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-720 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-721 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE 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.