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 541
QWEST CORPORATION 184
ONVOY, LLC - OR 70
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 69
T-MOBILE USA, INC. 54
CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 53
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
— 541-286 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - OR 076F CORVALLIS OR
— 541-290 none assigned yet which blocks → UNITED STATES CELLULAR - OR 6349 COOS BAY OR
— 541-291 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 GRANTSPASS OR
— 541-296 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 THE DALLES OR
— 541-298 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 THE DALLES OR
— 541-300 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 THE DALLES OR
— 541-301 none assigned yet which blocks → T-MOBILE USA, INC. 6529 MEDFORD OR
— 541-302 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-308 4XXX which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 HOOD RIVER OR
— 541-310 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 PENDLETON OR
— 541-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OR
— 541-312 not yet reported which blocks → QWEST CORPORATION 9638 BEND OR
— 541-313 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - OR 750E OAKRIDGE OR
— 541-316 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 REDMOND OR
— 541-317 not yet reported which blocks → QWEST CORPORATION 9638 BEND OR
— 541-318 not yet reported which blocks → QWEST CORPORATION 9638 BEND OR
— 541-319 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - OR 750E REEDSPORT OR
— 541-321 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 JUNCTIONCY OR
— 541-322 not yet reported which blocks → QWEST CORPORATION 9638 BEND OR
— 541-325 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9638 MADRAS OR
— 541-327 4XXX5XXX6XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9638 JEFFERSON OR
— 541-328 2XXX which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 PINE GROVE OR
— 541-329 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - OR 750E BANDON OR
— 541-330 not yet reported which blocks → QWEST CORPORATION 9638 BEND OR
— 541-331 7XXX8XXX which blocks → METROPCS, INC. 5562 KLAMATHFLS OR
— 541-332 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 PORTORFORD OR
— 541-333 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 GRASS VLY OR
— 541-334 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-335 1XXX9XXX which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-336 6XXX which blocks → QWEST CORPORATION 9638 TOLEDO OR
— 541-337 2XXX which blocks → T-MOBILE USA, INC. 6529 EUGENE OR
— 541-338 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-339 not yet reported which blocks → OREGON-IDAHO UTILITIES, INC. 2390 RIDGEVIEW OR
— 541-340 1XXX4XXX · 2 holders which blocks → METROPCS, INC. 5562 THE DALLES OR
— 541-341 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-342 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-343 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-344 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-345 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-346 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-347 0XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 BANDON OR
— 541-348 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 LANGLOIS OR
— 541-349 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-350 not yet reported which blocks → T-MOBILE USA, INC. 6529 BEND OR
— 541-352 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 PARKDALE OR
— 541-353 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 BLY OR
— 541-354 7XXX8XXX · 2 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 ODELL OR
— 541-356 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 ROCKYPOINT OR
— 541-358 not yet reported which blocks → OREGON TEL. CORP. 2389 HARPER OR
— 541-361 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → UNITED STATES CELLULAR - OR 6349 REEDSPORT 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.