NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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
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
— 541-682 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-683 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-684 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-685 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-686 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-687 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-688 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-689 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-713 not yet reported which blocks → QWEST CORPORATION 9638 CORVALLIS OR
— 541-714 0XXX1XXX2XXX3XXX5XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9638 CORVALLIS OR
— 541-715 not yet reported which blocks → QWEST CORPORATION 9638 CORVALLIS OR
— 541-726 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-732 not yet reported which blocks → QWEST CORPORATION 9638 MEDFORD OR
— 541-734 not yet reported which blocks → QWEST CORPORATION 9638 MEDFORD OR
— 541-736 6XXX which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-737 not yet reported which blocks → QWEST CORPORATION 9638 CORVALLIS OR
— 541-738 not yet reported which blocks → QWEST CORPORATION 9638 CORVALLIS OR
— 541-741 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-744 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-745 1XXX4XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9638 CORVALLIS OR
— 541-746 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-747 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-750 not yet reported which blocks → QWEST CORPORATION 9638 CORVALLIS OR
— 541-752 not yet reported which blocks → QWEST CORPORATION 9638 CORVALLIS OR
— 541-753 not yet reported which blocks → QWEST CORPORATION 9638 CORVALLIS OR
— 541-754 not yet reported which blocks → QWEST CORPORATION 9638 CORVALLIS OR
— 541-757 not yet reported which blocks → QWEST CORPORATION 9638 CORVALLIS OR
— 541-758 not yet reported which blocks → QWEST CORPORATION 9638 CORVALLIS OR
— 541-766 not yet reported which blocks → QWEST CORPORATION 9638 CORVALLIS OR
— 541-767 4XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9638 COTTAGEGRV OR
— 541-768 not yet reported which blocks → QWEST CORPORATION 9638 CORVALLIS OR
— 541-770 not yet reported which blocks → QWEST CORPORATION 9638 MEDFORD OR
— 541-772 not yet reported which blocks → QWEST CORPORATION 9638 MEDFORD OR
— 541-773 not yet reported which blocks → QWEST CORPORATION 9638 MEDFORD OR
— 541-774 not yet reported which blocks → QWEST CORPORATION 9638 MEDFORD OR
— 541-776 not yet reported which blocks → QWEST CORPORATION 9638 MEDFORD OR
— 541-779 not yet reported which blocks → QWEST CORPORATION 9638 MEDFORD OR
— 541-782 7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9638 OAKRIDGE OR
— 541-784 5XXX6XXX7XXX8XXX which blocks → QWEST CORPORATION 9638 ROSEBURG OR
— 541-791 6XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9638 ALBANY OR
— 541-812 not yet reported which blocks → QWEST CORPORATION 9638 ALBANY OR
— 541-822 not yet reported which blocks → QWEST CORPORATION 9638 BLUE RIVER OR
— 541-823 5XXX6XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9638 ONTARIO OR
— 541-850 not yet reported which blocks → QWEST CORPORATION 9638 KLAMATHFLS OR
— 541-851 1XXX2XXX3XXX4XXX6XXX7XXX9XXX · 6 holders which blocks → QWEST CORPORATION 9638 KLAMATHFLS OR
— 541-855 3XXX4XXX6XXX · 3 holders which blocks → QWEST CORPORATION 9638 GOLD HILL OR
— 541-857 not yet reported which blocks → QWEST CORPORATION 9638 MEDFORD OR
— 541-858 not yet reported which blocks → QWEST CORPORATION 9638 MEDFORD OR
— 541-864 0XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 MEDFORD OR
— 541-880 3XXX4XXX6XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 KLAMATHFLS OR

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.