NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

1 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, last 30 days — NPA 509
NEW CINGULAR WIRELESS PCS, LLC 1
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
— 509-232 9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPOKANE WA
— 509-233 4XXX5XXX6XXX7XXX · 4 holders which blocks → QWEST CORPORATION 9638 LOON LAKE WA
— 509-234 1XXX4XXX which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CONNELL WA
— 509-235 not yet reported which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CHENEY WA
— 509-236 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 EDWALLTYLR WA
— 509-238 7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9638 ELK-GRNBLF WA
— 509-239 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 EDWALLTYLR WA
— 509-241 3XXX6XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPOKANE WA
— 509-242 3XXX5XXX6XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPOKANE WA
— 509-243 1XXX6XXX7XXX8XXX · 3 holders which blocks → ASOTIN TEL CO 2404 ASOTIN WA
— 509-244 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-245 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 SPANGLE WA
— 509-246 2XXX3XXX6XXX8XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 SOAP LAKE WA
— 509-248 not yet reported which blocks → QWEST CORPORATION 9638 YAKIMA WA
— 509-249 not yet reported which blocks → QWEST CORPORATION 9638 YAKIMA WA
— 509-251 7XXX which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
— 509-252 0XXX which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 SPOKANE WA
— 509-253 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 HARRINGTON WA
— 509-254 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CLARKSTON WA
— 509-255 2XXX3XXX4XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9638 LIBERTY LK WA
— 509-256 none assigned yet which blocks → ASOTIN TEL CO 2404 ANATONE WA
— 509-257 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 SPRAGUE WA
— 509-258 2XXX3XXX5XXX · 3 holders which blocks → QWEST CORPORATION 9638 SPRINGDALE WA
— 509-259 2XXX4XXX5XXX8XXX which blocks → INLAND CELLULAR LLC 1477 SPRAGUE WA
— 509-261 4XXX5XXX8XXX9XXX · 2 holders which blocks → UNITED STATES CELLULAR - WA 6270 GOLDENDALE WA
— 509-262 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → QWEST CORPORATION 9638 DEER PARK WA
— 509-263 1XXX2XXX3XXX which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
— 509-264 2XXX5XXX6XXX which blocks → METROPCS, INC. 5562 WENATCHEE WA
— 509-265 3XXX6XXX7XXX8XXX which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CONNELL WA
— 509-266 0XXX2XXX3XXX6XXX7XXX8XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 MATHEWSCOR WA
— 509-267 not yet reported which blocks → ONVOY, LLC - WA 483E SPOKANE WA
— 509-269 2XXX3XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CONNELL WA
— 509-270 4XXX which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
— 509-271 not yet reported which blocks → ONVOY, LLC - WA 483E SPOKANE WA
— 509-272 not yet reported which blocks → ONVOY, LLC - WA 483E SPOKANE WA
— 509-274 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SUNNYSIDE WA
— 509-275 not yet reported which blocks → ONVOY, LLC - WA 483E SPOKANE WA
— 509-276 0XXX which blocks → QWEST CORPORATION 9638 DEER PARK WA
— 509-277 not yet reported which blocks → ONVOY, LLC - WA 483E SPOKANE WA
— 509-278 not yet reported which blocks → ONVOY, LLC - WA 483E SPOKANE WA
— 509-279 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPOKANE WA
— 509-280 7XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SPOKANE WA
— 509-281 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → UNITED STATES CELLULAR - WA 6270 WH SALMON WA
— 509-282 0XXX2XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CONNELL WA
— 509-283 0XXX1XXX3XXX5XXX7XXX8XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 ROCKFORD WA
— 509-284 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 TEKOA WA
— 509-285 0XXX1XXX2XXX3XXX7XXX9XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 OAKESDALE WA
— 509-286 1XXX2XXX7XXX8XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 ROCKFORD WA
— 509-287 0XXX1XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 FARMINGTON WA
— 509-289 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 EPHRATA 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.