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
2005-11-18 541-323 0–9 XXXwhole prefix which blocks → BENDTEL, INC. - OR 9627 BEND OR
2005-11-17 541-539 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KLAMATHFLS OR
2005-10-04 541-320 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 SUMPTER OR
2005-10-03 541-505 0–9 XXXall 10 · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 EUGENE OR
2005-09-20 541-550 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 BEND OR
2005-09-07 541-805 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 LA GRANDE OR
2005-09-01 541-813 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 BROOKINGS OR
2005-08-16 541-654 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J EUGENE OR
2005-06-20 541-792 7XXX8XXX9XXX · 2 holders which blocks → UNITED STATES CELLULAR - OR 6349 JOHN DAY OR
2005-01-13 541-215 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PENDLETON OR
2004-12-06 541-460 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 MADRAS OR
2004-11-17 541-455 not yet reported which blocks → AXXIS COMMUNICATION, INC. - OR 9231 ARLINGTON OR
2004-10-13 541-887 0–9 XXXall 10 · 8 holders which blocks → CAL-ORE COMMUNICATIONS, INC. - OR 348D KLAMATHFLS OR
2004-09-28 541-789 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9638 MEDFORD OR
2004-09-16 541-709 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 ONTARIO OR
2004-05-06 541-216 0–9 XXXall 10 · 5 holders which blocks → UNITED STATES CELLULAR - OR 6349 ONTARIO OR
2003-12-12 541-360 0–9 XXXall 10 · 6 holders which blocks → ALYRICA TELEPHONE LLC DBA NEXT GEN PHONE SYS-OR 9882 CORVALLIS OR
2003-10-30 541-526 0–9 XXXall 10 · 5 holders which blocks → QWEST CORPORATION 9638 REDMOND OR
2003-10-16 541-263 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 ENTERPRISE OR
2003-09-04 541-429 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PENDLETON OR
2003-08-05 541-425 0–9 XXXall 10 · 7 holders which blocks → UNITED STATES CELLULAR - OR 6349 GOLD BEACH OR
2003-07-02 541-435 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 COOS BAY OR
2003-07-01 541-423 0–9 XXXall 10 · 7 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 CENTRAL PT OR
2003-03-12 541-415 3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → UNITED STATES CELLULAR - OR 6349 CAVE JCT OR
2002-10-16 541-817 0–9 XXXall 10 · 2 holders which blocks → QWEST CORPORATION 9638 ROSEBURG OR
2002-09-17 541-406 0–9 XXXall 10 · 4 holders which blocks → ZIPLY FIBER, LLC 0760 BAKER OR
2002-09-12 541-418 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 LINCOLN CY OR
2002-09-09 541-404 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 COOS BAY OR
2002-09-09 541-417 3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → UNITED STATES CELLULAR - OR 6349 LAKEVIEW OR
2002-09-06 541-256 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → UNITED STATES CELLULAR - OR 6349 HEPPNER OR
2002-09-06 541-403 3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → UNITED STATES CELLULAR - OR 6349 BAKER OR
2002-09-06 541-413 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → UNITED STATES CELLULAR - OR 6349 BURNS OR
2002-09-04 541-399 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 HOOD RIVER OR
2002-08-29 541-398 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → UNITED STATES CELLULAR - OR 6349 ENTERPRISE OR
2002-08-14 541-392 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 CASCADELKS OR
2002-08-14 541-394 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 GRASS VLY OR
2002-08-14 541-402 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 PARKDALE OR
2002-08-12 541-551 2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 BANDON OR
2002-08-12 541-655 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 LANGLOIS OR
2002-08-01 541-254 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 BROOKINGS OR
2002-08-01 541-294 6XXX7XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 COOS BAY OR
2002-08-01 541-373 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 GOLD BEACH OR
2002-08-01 541-707 1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 REEDSPORT OR
2002-07-30 541-397 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 THE DALLES OR
2002-06-27 541-203 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 STATELINE OR
2002-06-19 541-253 2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTORFORD OR
2002-06-17 541-364 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → METROPCS, INC. 5562 LINCOLN CY OR
2002-06-17 541-370 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → AXXIS COMMUNICATION, INC. - OR 9231 THE DALLES OR
2002-05-14 541-366 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 PORTORFORD OR
2002-05-03 541-326 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 MEDFORD 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.