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
— 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 1XXX4XXX8XXX · 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
— 541-365 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 CHEMULT OR
— 541-367 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2395 SWEET HOME OR
— 541-369 not yet reported which blocks → ROOME TELECOMMUNICATIONS, INC. 2375 HALSEY OR
— 541-372 6XXX which blocks → QWEST CORPORATION 9638 NYSSA OR
— 541-374 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 CASCADELKS OR
— 541-376 2XXX3XXX4XXX6XXX7XXX9XXX · 4 holders which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 ECHO OR
— 541-377 none assigned yet which blocks → UNITED STATES CELLULAR - OR 6349 PENDLETON OR
— 541-378 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 ROSEBURG OR
— 541-379 none assigned yet which blocks → UNITED STATES CELLULAR - OR 6349 PENDLETON OR
— 541-380 2XXX3XXX7XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 HOOD RIVER OR
— 541-381 3XXX which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 FT KLAMATH OR
— 541-382 not yet reported which blocks → QWEST CORPORATION 9638 BEND OR
— 541-383 not yet reported which blocks → QWEST CORPORATION 9638 BEND OR
— 541-384 not yet reported which blocks → HOME TEL. CO. 2377 CONDON OR
— 541-385 not yet reported which blocks → QWEST CORPORATION 9638 BEND OR
— 541-386 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 HOOD RIVER OR
— 541-387 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 HOOD RIVER OR
— 541-388 not yet reported which blocks → QWEST CORPORATION 9638 BEND OR
— 541-389 not yet reported which blocks → QWEST CORPORATION 9638 BEND OR
— 541-390 2XXX which blocks → T-MOBILE USA, INC. 6529 BEND OR
— 541-391 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ROSEBURG OR

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.