NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

1 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, last 30 days — NPA 515
ONVOY, LLC - IA 1
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
— 515-547 not yet reported which blocks → LEHIGH VALLEY COOP. TEL. ASSN. 1225 DAYTON IA
— 515-548 not yet reported which blocks → LEHIGH VALLEY COOP. TEL. ASSN. 1225 CALLENDER IA
— 515-549 none assigned yet which blocks → WEBSTER-CALHOUN COOP. TEL. ASSN. 1328 MOORLAND IA
— 515-554 none assigned yet which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
— 515-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST IA
— 515-556 none assigned yet which blocks → T-MOBILE USA, INC. 6529 DES MOINES 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
— 515-559 3XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → AT&T - LOCAL 7421 DES MOINES IA
— 515-564 9XXX which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-570 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 FORT DODGE IA
— 515-571 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 FORT DODGE IA
— 515-572 not yet reported which blocks → QWEST CORPORATION 9631 AMES IA
— 515-573 0XXX9XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF IOWA, INC. 1127 FORT DODGE IA
— 515-574 9XXX which blocks → FRONTIER COMMUNICATIONS OF IOWA, INC. 1127 FORT DODGE IA
— 515-576 9XXX which blocks → FRONTIER COMMUNICATIONS OF IOWA, INC. 1127 FORT DODGE IA
— 515-577 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 DES MOINES IA
— 515-578 2XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 LAKOTA IA
— 515-583 not yet reported which blocks → COMMUNICATIONS 1 NETWORKS, INC. 1262 CORWITH IA
— 515-597 none assigned yet which blocks → HUXLEY COMMUNICATIONS COOPERATIVE 1205 HUXLEY IA
— 515-598 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9631 AMES IA
— 515-602 0XXX1XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → COMMUNICATIONS 1 NETWORK, INC. - IA 842E CLARION IA
— 515-603 0XXX1XXX2XXX7XXX9XXX · 3 holders which blocks → COMMUNICATIONS 1 NETWORK, INC. - IA 842E EAGLEGROVE IA
— 515-604 0XXX7XXX8XXX · 2 holders which blocks → COMMUNICATIONS 1 NETWORK, INC. - IA 842E HUMBOLDT IA
— 515-605 0XXX1XXX2XXX3XXX4XXX6XXX7XXX · 3 holders which blocks → COMMUNICATIONS 1 NETWORK, INC. - IA 842E RENWICK IA
— 515-606 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → COMMUNICATIONS 1 NETWORK, INC. - IA 842E WEBSTER CY IA
— 515-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX 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
— 515-646 0XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 LEDYARD IA
— 515-650 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 DES MOINES IA
— 515-663 not yet reported which blocks → QWEST CORPORATION 9631 AMES IA
— 515-668 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 PLEASANTVL IA
— 515-669 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 DES MOINES IA
— 515-674 2XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9631 COLFAX IA
— 515-676 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 BOUTON IA
— 515-677 not yet reported which blocks → MINBURN TEL. CO. 1245 MINBURN IA
— 515-679 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9631 WESLEY IA
— 515-681 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 DES MOINES IA
— 515-685 6XXX7XXX8XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 SLATER IA
— 515-687 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 PLEASANTVL IA
— 515-688 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 PLEASANTVL IA
— 515-689 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 DES MOINES 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
— 515-700 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IA
— 515-707 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DES MOINES IA

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.