NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

1 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, last 30 days — NPA 503
ONVOY, LLC - OR 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
— 503-217 0XXX2XXX3XXX4XXX9XXX · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 SHERWOOD OR
— 503-218 0XXX2XXX3XXX4XXX6XXX9XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 STFRD-SNDY OR
— 503-219 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-220 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-221 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-222 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-223 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-224 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-225 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-226 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-227 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-228 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-229 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-230 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-231 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-232 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-233 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-234 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-235 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-236 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-237 not yet reported which blocks → SPOK, INC. 6630 PORTLAND OR
— 503-238 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-239 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-240 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-241 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-242 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-243 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-244 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-245 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-246 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-247 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-248 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-249 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-250 none assigned yet which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-251 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-252 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-253 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-254 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-255 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-256 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-257 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-258 7XXX which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 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

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.