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
— 503-209 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-210 2XXX3XXX4XXX5XXX · 2 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 CLACKAMAS OR
— 503-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OR
— 503-212 3XXX4XXX · 2 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 CLACKAMAS OR
— 503-213 0XXX1XXX3XXX4XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 BEAVERTON OR
— 503-214 0XXX1XXX2XXX3XXX4XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 BEAVERTON OR
— 503-215 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-216 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 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

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.