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
— 360-272 4XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 ENUMCLAW WA
— 360-273 not yet reported which blocks → QWEST CORPORATION 9638 ROCHESTER WA
— 360-274 not yet reported which blocks → QWEST CORPORATION 9638 CASTLEROCK WA
— 360-275 not yet reported which blocks → QWEST CORPORATION 9638 BELFAIR WA
— 360-276 1XXX2XXX3XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 PACIFICBCH WA
— 360-277 1XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9638 BELFAIR WA
— 360-278 not yet reported which blocks → TENINO TEL. CO. 2446 BUCODA WA
— 360-279 6XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 OAK HARBOR WA
— 360-280 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 OLYMPIA WA
— 360-281 none assigned yet which blocks → T-MOBILE USA, INC. 6529 VANCOUVER WA
— 360-282 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 SNOHOMISH WA
— 360-283 5XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 MARYSVILLE WA
— 360-284 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ENUMCLAW WA
— 360-285 3XXX4XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 HOODSPORT WA
— 360-287 0XXX1XXX4XXX5XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 MARYSVILLE WA
— 360-288 1XXX3XXX4XXX7XXX8XXX · 4 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 LKQUINAULT WA
— 360-289 not yet reported which blocks → QWEST CORPORATION 9638 COPALIS WA
— 360-290 not yet reported which blocks → SPOK, INC. 6630 OLYMPIA WA
— 360-291 1XXX5XXX6XXX7XXX8XXX9XXX which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CURTIS WA
— 360-292 0XXX2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 OLYMPIA WA
— 360-293 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 MT VERNON WA
— 360-294 4XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SNOHOMISH WA
— 360-295 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 VADER WA
— 360-296 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 WHATCOMCTY WA
— 360-297 not yet reported which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 KINGSTON WA
— 360-298 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SAN JUAN WA
— 360-299 5XXX6XXX7XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 MT VERNON WA
— 360-300 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 FORKS WA
— 360-301 7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 PTTOWNSEND WA
— 360-302 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 PTTOWNSEND WA
— 360-303 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 WHATCOMCTY WA
— 360-304 1XXX2XXX3XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHEHALIS WA
— 360-305 3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 WHATCOMCTY WA
— 360-306 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 WHATCOMCTY WA
— 360-307 not yet reported which blocks → QWEST CORPORATION 9638 SILVERDALE WA
— 360-308 not yet reported which blocks → QWEST CORPORATION 9638 SILVERDALE WA
— 360-310 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 ABERDEEN WA
— 360-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 360-312 3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 WHATCOMCTY WA
— 360-313 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 VANCOUVER WA
— 360-314 2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 VANCOUVER WA
— 360-315 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 POULSBO WA
— 360-316 3XXX4XXX6XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 PTTOWNSEND WA
— 360-317 0XXX2XXX3XXX9XXX · 2 holders which blocks → CENTURYTEL OF INTER-ISLAND, INC. DBA CENTURYLINK 2422 SAN JUAN WA
— 360-318 3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 WHATCOMCTY WA
— 360-319 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 WHATCOMCTY WA
— 360-320 3XXX4XXX5XXX6XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 OAK HARBOR WA
— 360-321 none assigned yet which blocks → WHIDBEY TEL. CO. 2452 SO WHIDBEY WA
— 360-322 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 MARYSVILLE WA
— 360-323 not yet reported which blocks → ONVOY, LLC - WA 483E OAK HARBOR 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.