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
— 541-951 none assigned yet which blocks → UNITED STATES CELLULAR - OR 6349 MEDFORD OR
— 541-952 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 9 holders which blocks → QWEST CORPORATION 9638 JUNCTIONCY OR
— 541-953 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 EUGENE OR
— 541-954 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 EUGENE OR
— 541-955 not yet reported which blocks → QWEST CORPORATION 9638 GRANTSPASS OR
— 541-956 3XXX4XXX · 2 holders which blocks → QWEST CORPORATION 9638 GRANTSPASS OR
— 541-957 not yet reported which blocks → QWEST CORPORATION 9638 ROSEBURG OR
— 541-958 not yet reported which blocks → OR
— 541-959 not yet reported which blocks → OR
— 541-961 5XXX6XXX7XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 NEWPORT OR
— 541-962 none assigned yet which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 LA GRANDE OR
— 541-963 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 LA GRANDE OR
— 541-964 not yet reported which blocks → PIONEER TEL. COOPERATIVE 2393 TRIANGLELK OR
— 541-965 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 THE DALLES OR
— 541-966 5XXX which blocks → QWEST CORPORATION 9638 PENDLETON OR
— 541-967 not yet reported which blocks → QWEST CORPORATION 9638 ALBANY OR
— 541-968 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 EUGENE OR
— 541-969 5XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PENDLETON OR
— 541-970 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → UNITED STATES CELLULAR - OR 6349 PENDLETON OR
— 541-971 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ALBANY OR
— 541-973 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → UNITED STATES CELLULAR - OR 6349 MEDFORD OR
— 541-974 8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ALBANY OR
— 541-975 0XXX6XXX8XXX9XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 LA GRANDE OR
— 541-976 not yet reported which blocks → OR
— 541-977 1XXX which blocks → UNITED STATES CELLULAR - OR 6349 BEND OR
— 541-978 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → UNITED STATES CELLULAR - OR 6349 THE DALLES OR
— 541-979 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ALBANY OR
— 541-980 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 THE DALLES OR
— 541-981 2XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → METROPCS, INC. 5562 ALBANY OR
— 541-982 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → UNITED STATES CELLULAR - OR 6349 COOS BAY OR
— 541-983 not yet reported which blocks → HELIX TEL. CO. 2376 MEACHAM OR
— 541-984 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-987 not yet reported which blocks → OREGON TEL. CORP. 2389 DAYVILLE OR
— 541-988 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-989 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 LEXINGTON OR
— 541-990 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 ALBANY OR
— 541-991 3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 FLORENCE OR
— 541-992 7XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LINCOLN CY OR
— 541-993 none assigned yet which blocks → UNITED STATES CELLULAR - OR 6349 THE DALLES OR
— 541-994 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 LINCOLN CY OR
— 541-995 0XXX5XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9638 HARRISBURG OR
— 541-996 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 LINCOLN CY OR
— 541-997 not yet reported which blocks → QWEST CORPORATION 9638 FLORENCE OR
— 541-998 not yet reported which blocks → QWEST CORPORATION 9638 JUNCTIONCY OR
— 541-999 3XXX4XXX5XXX6XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 FLORENCE 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.