NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

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

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
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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
— 425-279 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
— 425-342 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 EVERETT WA
— 425-345 not yet reported which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
— 425-346 not yet reported which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
— 425-347 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-348 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-349 0XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-350 not yet reported which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
— 425-351 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-352 not yet reported which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 BOTHELL WA
— 425-353 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
— 425-354 0XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 BOTHELL WA
— 425-355 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 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.