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
— 360-215 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PORTLUDLOW WA
— 360-216 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 CAMAS WA
— 360-217 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 SNOHOMISH WA
— 360-219 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 CHEHALIS WA
— 360-220 8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 WHATCOMCTY WA
— 360-221 none assigned yet which blocks → WHIDBEY TEL. CO. 2452 SO WHIDBEY WA
— 360-222 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → WHIDBEY TEL. CO. 2452 SO WHIDBEY WA
— 360-223 not yet reported which blocks → T-MOBILE USA, INC. 6529 WHATCOMCTY WA
— 360-225 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 WOODLAND WA
— 360-226 0XXX1XXX2XXX3XXX4XXX5XXX9XXX · 4 holders which blocks → ONVOY, LLC - WA 483E ENUMCLAW WA
— 360-227 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - WA 483E BELFAIR WA
— 360-230 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 MT VERNON WA
— 360-231 0XXX which blocks → LEWIS RIVER TEL. CO., INC. 2427 YALE WA
— 360-233 2XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 BELFAIR WA
— 360-234 2XXX3XXX4XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 BUCKLEY WA
— 360-235 none assigned yet which blocks → ONVOY, LLC - WA 483E BUCODA WA
— 360-236 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-237 4XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 CENTRALIA WA
— 360-238 none assigned yet which blocks → LEWIS RIVER TEL. CO., INC. 2427 COUGAR WA
— 360-239 none assigned yet which blocks → T-MOBILE USA, INC. 6529 OLYMPIA WA
— 360-240 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 OAK HARBOR WA
— 360-241 2XXX which blocks → T-MOBILE USA, INC. 6529 VANCOUVER WA
— 360-242 3XXX4XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 CHEHALIS WA
— 360-245 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CURTIS WA
— 360-246 4XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 OAK HARBOR WA
— 360-247 8XXX which blocks → LEWIS RIVER TEL. CO., INC. 2427 AMBOY WA
— 360-248 4XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 CRYSTAL MT WA
— 360-249 7XXX8XXX9XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 MONTESANO WA
— 360-250 none assigned yet which blocks → T-MOBILE USA, INC. 6529 OLYMPIA WA
— 360-251 0XXX4XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 MARYSVILLE WA
— 360-252 0XXX3XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 OLYMPIA WA
— 360-253 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-254 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-255 0XXX1XXX3XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 WHATCOMCTY WA
— 360-256 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-257 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 OAK HARBOR WA
— 360-258 none assigned yet which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 VANCOUVER WA
— 360-259 4XXX5XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 OLYMPIA WA
— 360-260 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-261 6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 LONGVIEW WA
— 360-262 1XXX2XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9638 CHEHALIS WA
— 360-263 none assigned yet which blocks → LEWIS RIVER TEL. CO., INC. 2427 LA CENTER WA
— 360-264 not yet reported which blocks → TENINO TEL. CO. 2446 TENINO WA
— 360-265 5XXX6XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SILVERDALE WA
— 360-266 2XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9638 CHEHALIS WA
— 360-267 5XXX7XXX9XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 GRAYHARBCO WA
— 360-268 2XXX3XXX4XXX7XXX8XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 GRAYHARBCO WA
— 360-269 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CHEHALIS WA
— 360-270 2XXX4XXX5XXX8XXX · 2 holders which blocks → METROPCS, INC. 5562 LONGVIEW WA
— 360-271 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SILVERDALE 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.