NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 425
ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 122
T-MOBILE USA, INC. 91
QWEST CORPORATION 69
LEVEL 3 COMMUNICATIONS, LLC - WA 49
NEW CINGULAR WIRELESS PCS, LLC 44
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
— 425-265 6XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-266 none assigned yet which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-267 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-268 not yet reported which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
— 425-269 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-270 0–9 XXXall 10 · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 ISSAQUAH WA
— 425-271 not yet reported which blocks → QWEST CORPORATION 9638 RENTON WA
— 425-272 3XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 RENTON WA
— 425-273 2XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 BOTHELL WA
— 425-274 2XXX3XXX5XXX6XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BELLEVUE WA
— 425-276 0XXX1XXX2XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 RENTON WA
— 425-277 not yet reported which blocks → QWEST CORPORATION 9638 RENTON WA
— 425-279 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → XO WASHINGTON, INC. 7340 BELLEVUE WA
— 425-280 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
— 425-281 3XXX4XXX5XXX7XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ISSAQUAH WA
— 425-282 1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 RENTON WA
— 425-283 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 BELLEVUE WA
— 425-284 3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 KIRKLAND WA
— 425-288 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 BOTHELL WA
— 425-289 6XXX8XXX9XXX which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 BELLEVUE WA
— 425-290 none assigned yet which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-291 6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9638 RENTON WA
— 425-294 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 EVERETT WA
— 425-296 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
— 425-297 0XXX3XXX4XXX9XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-299 3XXX4XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 EVERETT WA
— 425-303 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-304 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-307 0XXX1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
— 425-308 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 EVERETT WA
— 425-310 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 MAPLE VLY WA
— 425-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 425-313 not yet reported which blocks → QWEST CORPORATION 9638 ISSAQUAH WA
— 425-314 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 EVERETT WA
— 425-315 2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-316 7XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 SILVERLAKE WA
— 425-317 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-318 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BOTHELL WA
— 425-319 4XXX which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
— 425-321 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SILVERLAKE WA
— 425-322 3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 EVERETT WA
— 425-327 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 EVERETT WA
— 425-330 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 EVERETT WA
— 425-332 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SILVERLAKE WA
— 425-333 1XXX2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CARNATION WA
— 425-334 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-335 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-337 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 SILVERLAKE WA
— 425-338 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 SILVERLAKE WA
— 425-339 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.