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 360
QWEST CORPORATION 170
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 82
ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 81
T-MOBILE USA, INC. 66
LEVEL 3 COMMUNICATIONS, LLC - WA 61
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
— 360-730 none assigned yet which blocks → WHIDBEY TEL. CO. 2452 SO WHIDBEY WA
— 360-731 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SILVERDALE WA
— 360-732 1XXX2XXX3XXX5XXX6XXX8XXX · 4 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 CHIMACMCTR WA
— 360-733 not yet reported which blocks → QWEST CORPORATION 9638 WHATCOMCTY WA
— 360-734 not yet reported which blocks → QWEST CORPORATION 9638 WHATCOMCTY WA
— 360-735 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-736 not yet reported which blocks → QWEST CORPORATION 9638 CENTRALIA WA
— 360-737 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-738 not yet reported which blocks → QWEST CORPORATION 9638 WHATCOMCTY WA
— 360-739 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 WHATCOMCTY WA
— 360-740 not yet reported which blocks → QWEST CORPORATION 9638 CHEHALIS WA
— 360-741 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-746 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 WHATCOMCTY WA
— 360-747 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → UNITED STATES CELLULAR - WA 6270 LONGVIEW WA
— 360-748 none assigned yet which blocks → QWEST CORPORATION 9638 CHEHALIS WA
— 360-749 8XXX which blocks → UNITED STATES CELLULAR - WA 6270 LONGVIEW WA
— 360-750 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-751 none assigned yet which blocks → UNITED STATES CELLULAR - WA 6270 LONGVIEW WA
— 360-752 not yet reported which blocks → QWEST CORPORATION 9638 WHATCOMCTY WA
— 360-753 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-754 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-755 3XXX6XXX7XXX8XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 MT VERNON WA
— 360-756 not yet reported which blocks → QWEST CORPORATION 9638 WHATCOMCTY WA
— 360-757 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 MT VERNON WA
— 360-758 not yet reported which blocks → QWEST CORPORATION 9638 WHATCOMCTY WA
— 360-759 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-760 0XXX4XXX5XXX6XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 LA CENTER WA
— 360-765 1XXX which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 HOOD CANAL WA
— 360-766 0XXX2XXX3XXX9XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 MT VERNON WA
— 360-767 1XXX2XXX5XXX7XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9638 CHEHALIS WA
— 360-769 3XXX which blocks → QWEST CORPORATION 9638 PORT ORCH WA
— 360-770 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 MT VERNON WA
— 360-771 8XXX which blocks → T-MOBILE USA, INC. 6529 VANCOUVER WA
— 360-772 8XXX9XXX which blocks → METROPCS, INC. 5562 VANCOUVER WA
— 360-777 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 LONG BEACH WA
— 360-778 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9638 WHATCOMCTY WA
— 360-779 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 POULSBO WA
— 360-780 1XXX2XXX3XXX4XXX6XXX7XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 FORKS WA
— 360-782 not yet reported which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-785 2XXX5XXX6XXX · 2 holders which blocks → QWEST CORPORATION 9638 WINLOCK WA
— 360-786 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-788 3XXX4XXX5XXX6XXX · 3 holders which blocks → QWEST CORPORATION 9638 WHATCOMCTY WA
— 360-789 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 OLYMPIA WA
— 360-790 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 OLYMPIA WA
— 360-791 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 OLYMPIA WA
— 360-792 not yet reported which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-793 5XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 SNOHOMISH WA
— 360-794 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 SNOHOMISH WA
— 360-795 1XXX2XXX4XXX5XXX7XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CATHLAMET WA
— 360-796 5XXX7XXX · 2 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 HOOD CANAL 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.