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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 928-810 9XXX which blocks → NAVAJO COMM CO INC - AZ DBA FRONTIER NAVAJO COM 4449 WINDOWROCK AZ
— 928-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AZ
— 928-812 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 GLOBE AZ
— 928-813 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7175 GLOBE AZ
— 928-817 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7175 YUMA AZ
— 928-819 none assigned yet which blocks → QWEST CORPORATION 9636 YUMA AZ
— 928-821 7XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SEDONA AZ
— 928-828 not yet reported which blocks → VALLEY TEL COOP INC 2176 BONITA AZ
— 928-830 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PRESCOTT AZ
— 928-832 not yet reported which blocks → ONVOY, LLC - AZ 630E FLAGSTAFF AZ
— 928-833 not yet reported which blocks → ONVOY, LLC - AZ 630E FLAGSTAFF AZ
— 928-851 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER COMMUNICATIONS OF THE SOUTHWEST INC. - AZ 4419 BOUSE AZ
— 928-853 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 FLAGSTAFF AZ
— 928-854 not yet reported which blocks → CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 2172 LKHAVASUCY AZ
— 928-855 not yet reported which blocks → CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 2172 LKHAVASUCY AZ
— 928-856 3XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 FLAGSTAFF AZ
— 928-857 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER COMMUNICATIONS OF THE SOUTHWEST INC. - AZ 4419 CIBOLA AZ
— 928-858 not yet reported which blocks → TABLE TOP TELEPHONE COMPANY 3334 INCRPTCNYN AZ
— 928-859 1XXX2XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN TEL. CO. 2174 SALOME AZ
— 928-865 not yet reported which blocks → VALLEY TEL COOP INC 2176 CLIFTON AZ
— 928-871 not yet reported which blocks → NAVAJO COMM CO INC - AZ DBA FRONTIER NAVAJO COM 4449 WINDOWROCK AZ
— 928-875 5XXX which blocks → SOUTH CENTRAL UTAH TEL. ASSN., INC. 2286 COLORADOCY AZ
— 928-888 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → ONVOY, LLC - AZ 630E GRANDCNYON AZ
— 928-890 0XXX1XXX2XXX3XXX5XXX6XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 FLAGSTAFF AZ
— 928-892 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SHOW LOW AZ
— 928-899 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PRESCOTT AZ
— 928-910 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PRESCOTT AZ
— 928-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AZ
— 928-913 not yet reported which blocks → QWEST CORPORATION 9636 FLAGSTAFF AZ
— 928-916 5XXX6XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 QUARTZSITE AZ
— 928-919 7XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 YUMA AZ
— 928-920 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 YUMA AZ
— 928-923 1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → FRONTIER COMMUNICATIONS OF THE SOUTHWEST INC. - AZ 4419 EHRENBERG AZ
— 928-925 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PRESCOTT AZ
— 928-927 1XXX2XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN TEL. CO. 2174 QUARTZSITE AZ
— 928-941 4XXX5XXX which blocks → T-MOBILE USA, INC. 6529 YUMA AZ
— 928-950 not yet reported which blocks → AZ
— 928-951 none assigned yet which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PAYSON AZ
— 928-958 not yet reported which blocks → AZ
— 928-959 not yet reported which blocks → AZ
— 928-961 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 GLOBE AZ
— 928-962 not yet reported which blocks → ONVOY, LLC - AZ 630E FLAGSTAFF AZ
— 928-963 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SEDONA AZ
— 928-970 3XXX4XXX5XXX7XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PAYSON AZ
— 928-976 not yet reported which blocks → AZ
— 928-978 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PAYSON AZ
— 928-988 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 YUMA 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.