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 515
QWEST CORPORATION 147
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
— 515-532 0XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → QWEST CORPORATION 9631 CLARION IA
— 515-557 0XXX which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-558 not yet reported which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-564 9XXX which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-572 not yet reported which blocks → QWEST CORPORATION 9631 AMES IA
— 515-598 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9631 AMES IA
— 515-633 4XXX5XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-643 not yet reported which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-645 9XXX which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-663 not yet reported which blocks → QWEST CORPORATION 9631 AMES IA
— 515-674 2XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9631 COLFAX IA
— 515-679 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9631 WESLEY IA
— 515-695 2XXX which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-697 not yet reported which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-698 not yet reported which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-699 not yet reported which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-725 not yet reported which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-727 not yet reported which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-758 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9631 EARLHAM IA
— 515-817 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9631 AMES IA
— 515-827 0XXX2XXX3XXX4XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9631 JEWELL IA
— 515-832 0XXX which blocks → QWEST CORPORATION 9631 WEBSTER CY IA
— 515-854 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9631 WILLIAMS IA
— 515-882 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 LUVERNE IA
— 515-883 0XXX which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-884 1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 WHITTEMORE IA
— 515-953 8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-956 not yet reported which blocks → QWEST CORPORATION 9631 AMES IA
— 515-957 1XXX2XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-961 not yet reported which blocks → QWEST CORPORATION 9631 INDIANOLA IA
— 515-962 5XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9631 INDIANOLA IA
— 515-963 2XXX5XXX6XXX · 2 holders which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-964 not yet reported which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-965 not yet reported which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-966 3XXX4XXX5XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 RUNNELLS IA
— 515-967 not yet reported which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-974 4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-981 2XXX3XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-984 0XXX2XXX3XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 POLK CITY IA
— 515-986 6XXX8XXX which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-987 not yet reported which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-989 1XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-992 0XXX2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9631 DALLAS CTR IA
— 515-993 0XXX7XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9631 ADEL IA
— 515-994 0XXX4XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 PRAIRIE CY IA
— 515-996 0XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 VAN METER IA
— 515-999 0XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 GRANGER IA

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.