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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2025-03-07 541-503 0–9 XXXall 10 · 3 holders which blocks → LEAP TELECOM, LLC 616J EUGENE OR
2024-08-15 541-541 0–9 XXXwhole prefix which blocks → ONVOY, LLC - OR 750E BROOKINGS OR
2023-12-08 541-458 0XXX1XXX9XXX · 3 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K WOLF CREEK OR
2023-09-06 541-208 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BEND OR
2023-08-18 541-309 0XXX1XXX2XXX6XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - OR 076F LAKEVIEW OR
2018-06-21 541-642 not yet reported which blocks → ALYRICA TELEPHONE LLC DBA NEXT GEN PHONE SYS-OR 9882 HALSEY OR
2017-12-11 541-717 0–9 XXXall 10 · 9 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BAKER OR
2016-12-01 541-675 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - OR 750E MADRAS OR
2016-01-20 541-666 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 ALBANY OR
2015-12-16 541-916 0–9 XXXall 10 · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 GRANTSPASS OR
2015-12-14 541-674 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CRESWELL OR
2015-12-08 541-780 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - OR 750E EUGENE OR
2015-11-12 541-529 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 OAKLAND OR
2015-10-28 541-527 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 REDMOND OR
2015-09-17 541-640 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 BEND OR
2015-05-06 541-583 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - OR 076F HARRISBURG OR
2015-05-05 541-625 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - OR 076F ASHLAND OR
2015-05-01 541-581 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - OR 076F LOWELL OR
2015-04-24 541-799 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - OR 076F EUGENE OR
2015-04-09 541-838 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - OR 076F PROVOTMPHY OR
2015-03-16 541-807 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 UNION OR
2015-03-16 541-841 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 MEDFORD OR
2015-03-13 541-900 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 ROSEBURG OR
2014-11-06 541-797 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - OR 076F BEND OR
2014-10-16 541-930 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 MEDFORD OR
2014-09-23 541-800 0–9 XXXall 10 · 7 holders which blocks → PEERLESS NETWORK OF OREGON, LLC - OR 157F STANFIELD OR
2014-08-29 541-801 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 ALBANY OR
2014-08-15 541-668 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 BEND OR
2014-06-25 541-809 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - OR 750E MILTONFWTR OR
2014-06-19 541-204 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - OR 076F LEABURG OR
2014-04-02 541-371 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 HERMISTON OR
2014-03-04 541-972 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - OR 750E EUGENE OR
2014-02-06 541-843 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 JACKSONVL OR
2014-01-27 541-919 0–9 XXXall 10 · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J ATHENA OR
2013-12-24 541-920 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OR 7442 VALE OR
2013-12-03 541-904 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SISTERS OR
2013-12-03 541-907 0–9 XXXall 10 · 8 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LAPINE OR
2013-08-27 541-901 0–9 XXXall 10 · 8 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J FLORENCE OR
2013-08-22 541-735 0–9 XXXall 10 · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 EUGENE OR
2013-04-23 541-699 0–9 XXXall 10 · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 REDMOND OR
2013-04-10 541-903 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PRINEVILLE OR
2013-04-04 541-209 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - OR 750E JEFFERSON OR
2013-01-29 541-816 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 MEDFORD OR
2013-01-09 541-630 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 CENTRAL PT OR
2012-10-30 541-213 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BEND OR
2012-10-23 541-600 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 551G EUGENE OR
2012-10-16 541-631 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - OR 076F ASHLAND OR
2012-09-20 541-802 0–9 XXXall 10 · 6 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K OAKLAND OR
2012-08-31 541-500 0–9 XXXall 10 · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K MEDFORD OR
2012-08-01 541-507 0–9 XXXall 10 · 5 holders which blocks → QWEST CORPORATION 9638 GRANTSPASS 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.