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
— 360-380 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 WHATCOMCTY WA
— 360-381 1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PTTOWNSEND WA
— 360-382 3XXX6XXX7XXX8XXX which blocks → ONVOY, LLC - WA 483E PTTOWNSEND WA
— 360-383 1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 WHATCOMCTY WA
— 360-384 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 WHATCOMCTY WA
— 360-385 not yet reported which blocks → QWEST CORPORATION 9638 PTTOWNSEND WA
— 360-386 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MARYSVILLE WA
— 360-387 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 MARYSVILLE WA
— 360-389 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 WHATCOMCTY WA
— 360-391 6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 MT VERNON WA
— 360-392 5XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 WHATCOMCTY WA
— 360-393 1XXX3XXX4XXX5XXX6XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 WHATCOMCTY WA
— 360-394 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 POULSBO WA
— 360-395 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 MT VERNON WA
— 360-396 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 POULSBO WA
— 360-397 none assigned yet which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 VANCOUVER WA
— 360-398 3XXX4XXX5XXX6XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 WHATCOMCTY WA
— 360-399 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 MT VERNON WA
— 360-400 not yet reported which blocks → YCOM NETWORKS, INC. 2453 YELM WA
— 360-401 2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → UNITED STATES CELLULAR - WA 6270 SHELTON WA
— 360-402 2XXX which blocks → T-MOBILE USA, INC. 6529 OLYMPIA WA
— 360-403 5XXX6XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 MARYSVILLE WA
— 360-404 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → ONVOY, LLC - WA 483E MT VERNON WA
— 360-405 not yet reported which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-406 0XXX1XXX4XXX5XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 PT ANGELES WA
— 360-407 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-408 not yet reported which blocks → SPOK, INC. 6630 VANCOUVER WA
— 360-409 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 CAMAS WA
— 360-410 2XXX3XXX4XXX5XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 WHATCOMCTY WA
— 360-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 360-412 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-413 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-414 not yet reported which blocks → QWEST CORPORATION 9638 LONGVIEW WA
— 360-415 not yet reported which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-416 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 MT VERNON WA
— 360-417 not yet reported which blocks → QWEST CORPORATION 9638 PT ANGELES WA
— 360-418 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-419 4XXX5XXX6XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 MT VERNON WA
— 360-420 3XXX4XXX5XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MT VERNON WA
— 360-422 0XXX1XXX2XXX3XXX4XXX9XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 MT VERNON WA
— 360-423 not yet reported which blocks → QWEST CORPORATION 9638 LONGVIEW WA
— 360-424 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 MT VERNON WA
— 360-425 not yet reported which blocks → QWEST CORPORATION 9638 LONGVIEW WA
— 360-426 not yet reported which blocks → QWEST CORPORATION 9638 SHELTON WA
— 360-427 not yet reported which blocks → QWEST CORPORATION 9638 SHELTON WA
— 360-428 9XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 MT VERNON WA
— 360-429 0XXX9XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 MT VERNON WA
— 360-430 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LONGVIEW WA
— 360-431 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LONGVIEW WA
— 360-432 4XXX6XXX · 2 holders which blocks → QWEST CORPORATION 9638 SHELTON 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.