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 928
QWEST CORPORATION 95
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 91
ONVOY, LLC - AZ 66
NEW CINGULAR WIRELESS PCS, LLC 43
T-MOBILE USA, INC. 40
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
— 928-638 5XXX which blocks → QWEST CORPORATION 9636 GRANDCNYON AZ
— 928-639 not yet reported which blocks → QWEST CORPORATION 9636 SEDONA AZ
— 928-640 8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PAGE AZ
— 928-641 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7175 SEDONA AZ
— 928-643 none assigned yet which blocks → SOUTH CENTRAL UTAH TEL. ASSN., INC. 2286 FREDONIA AZ
— 928-645 not yet reported which blocks → QWEST CORPORATION 9636 PAGE AZ
— 928-646 2XXX which blocks → QWEST CORPORATION 9636 SEDONA AZ
— 928-649 not yet reported which blocks → QWEST CORPORATION 9636 SEDONA AZ
— 928-651 9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SAFFORD AZ
— 928-652 1XXX4XXX8XXX · 3 holders which blocks → NAVAJO COMM CO INC - AZ DBA FRONTIER NAVAJO COM 4449 WIDE RUINS AZ
— 928-653 2XXX7XXX8XXX · 3 holders which blocks → NAVAJO COMM CO INC - AZ DBA FRONTIER NAVAJO COM 4449 RED VALLEY AZ
— 928-654 2XXX7XXX8XXX · 3 holders which blocks → NAVAJO COMM CO INC - AZ DBA FRONTIER NAVAJO COM 4449 GREASEWOOD AZ
— 928-656 none assigned yet which blocks → NAVAJO COMM CO INC - AZ DBA FRONTIER NAVAJO COM 4449 TEECNOSPOS AZ
— 928-657 not yet reported which blocks → NAVAJO COMM CO INC - AZ DBA FRONTIER NAVAJO COM 4449 DILKON AZ
— 928-658 2XXX7XXX8XXX · 3 holders which blocks → NAVAJO COMM CO INC - AZ DBA FRONTIER NAVAJO COM 4449 DENNEHOTSO AZ
— 928-659 1XXX2XXX8XXX · 3 holders which blocks → NAVAJO COMM CO INC - AZ DBA FRONTIER NAVAJO COM 4449 ROCK POINT AZ
— 928-660 4XXX5XXX6XXX7XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PAGE AZ
— 928-662 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER COMMUNICATIONS OF THE SOUTHWEST INC. - AZ 4419 PARKER DAM AZ
— 928-667 0XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER COMMUNICATIONS OF THE SOUTHWEST INC. - AZ 4419 PARKER DAM AZ
— 928-668 2XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9636 WICKENBURG AZ
— 928-669 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE SOUTHWEST INC. - AZ 4419 PARKER AZ
— 928-671 3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 WICKENBURG AZ
— 928-672 1XXX4XXX8XXX · 3 holders which blocks → NAVAJO COMM CO INC - AZ DBA FRONTIER NAVAJO COM 4449 SHONTO AZ
— 928-673 2XXX7XXX8XXX · 3 holders which blocks → NAVAJO COMM CO INC - AZ DBA FRONTIER NAVAJO COM 4449 KAIBITO AZ
— 928-674 not yet reported which blocks → NAVAJO COMM CO INC - AZ DBA FRONTIER NAVAJO COM 4449 CHINLE AZ
— 928-677 not yet reported which blocks → NAVAJO COMM CO INC - AZ DBA FRONTIER NAVAJO COM 4449 BLACK MESA AZ
— 928-679 0XXX1XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → QWEST CORPORATION 9636 FLAGSTAFF AZ
— 928-680 not yet reported which blocks → CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 2172 LKHAVASUCY AZ
— 928-681 7XXX which blocks → CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 2172 KINGMAN AZ
— 928-683 1XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9636 GILA BEND AZ
— 928-684 not yet reported which blocks → QWEST CORPORATION 9636 WICKENBURG AZ
— 928-685 not yet reported which blocks → TABLE TOP TELEPHONE COMPANY 3334 AGUILA AZ
— 928-686 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → NAVAJO COMM CO INC - AZ DBA FRONTIER NAVAJO COM 4449 LEUPP AZ
— 928-687 not yet reported which blocks → VALLEY TEL COOP INC 2176 YORKVALLEY AZ
— 928-688 not yet reported which blocks → TABLE TOP TELEPHONE COMPANY 3334 SANDERS AZ
— 928-691 1XXX4XXX6XXX7XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PAGE AZ
— 928-692 not yet reported which blocks → CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 2172 KINGMAN AZ
— 928-693 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - AZ 630E PAGE AZ
— 928-697 not yet reported which blocks → NAVAJO COMM CO INC - AZ DBA FRONTIER NAVAJO COM 4449 KAYENTA AZ
— 928-698 5XXX6XXX8XXX · 3 holders which blocks → NAVAJO COMM CO INC - AZ DBA FRONTIER NAVAJO COM 4449 LE CHEE AZ
— 928-699 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 FLAGSTAFF AZ
— 928-700 not yet reported which blocks → AZ
— 928-701 4XXX5XXX6XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 GLOBE AZ
— 928-704 not yet reported which blocks → CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 2172 BULLHEADCY AZ
— 928-706 1XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LKHAVASUCY AZ
— 928-707 5XXX6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 FLAGSTAFF AZ
— 928-708 8XXX which blocks → QWEST CORPORATION 9636 PRESCOTT AZ
— 928-710 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PRESCOTT AZ
— 928-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AZ
— 928-713 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PRESCOTT AZ

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.