NumberResearch Membership · Data 10/01/2026

Recent prefix assignments

374 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 10/01/2026

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 Oct 2026 Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025
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Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 503-259 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 BEAVERTON OR
— 503-260 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PORTLAND OR
— 503-261 3XXX which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-262 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-263 not yet reported which blocks → CANBY TEL. ASSN. 2362 CANBYNEEDY OR
— 503-264 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BEAVERTON OR
— 503-265 9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 PORTLAND OR
— 503-266 not yet reported which blocks → CANBY TEL. ASSN. 2362 CANBYNEEDY OR
— 503-267 not yet reported which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-268 2XXX3XXX7XXX9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 BEAVERTON OR
— 503-269 1XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SALEM OR
— 503-270 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 BEAVERTON OR
— 503-271 not yet reported which blocks → SPOK, INC. 6630 PORTLAND OR
— 503-272 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 GOVENTCAMP OR
— 503-273 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-274 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-275 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-276 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-277 0XXX3XXX8XXX9XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 BEAVERTON OR
— 503-279 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-280 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-281 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-282 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-283 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-284 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-285 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-286 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-287 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-288 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-289 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-290 3XXX4XXX6XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PORTLAND OR
— 503-291 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-292 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-293 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-294 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-295 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-296 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-297 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-299 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-301 not yet reported which blocks → SPOK, INC. 6630 PORTLAND OR
— 503-302 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 SALEM OR
— 503-303 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CLACKAMAS OR
— 503-304 not yet reported which blocks → QWEST CORPORATION 9638 SALEM OR
— 503-305 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CLACKAMAS OR
— 503-306 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-307 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PORTLAND OR
— 503-308 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 CLATSKANIE OR
— 503-309 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-310 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PORTLAND OR
— 503-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OR

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 10/01/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.