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 323
PACIFIC BELL 265
METROPCS NETWORKS, LLC 85
T-MOBILE USA, INC. 64
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 45
NEW CINGULAR WIRELESS PCS, LLC 39
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
— 323-860 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 14 CA
— 323-862 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 14 CA
— 323-863 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 05 CA
— 323-864 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LSAN DA 12 CA
— 323-865 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → FRONTIER CALIFORNIA INC. 7534 LSAN DA 04 CA
— 323-866 0XXX4XXX5XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 LSAN DA 13 CA
— 323-867 0–9 XXXall 10 · 2 holders which blocks → METROPCS NETWORKS, LLC 899D MONTEBELLO CA
— 323-868 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LSAN DA 14 CA
— 323-869 not yet reported which blocks → PACIFIC BELL 9740 MONTEBELLO CA
— 323-870 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PACIFIC BELL 9740 LSAN DA 11 CA
— 323-871 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 14 CA
— 323-872 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 LSAN DA 14 CA
— 323-873 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 LSAN DA 14 CA
— 323-874 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 14 CA
— 323-875 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → PACIFIC BELL 9740 LSAN DA 14 CA
— 323-876 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 14 CA
— 323-877 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → PACIFIC BELL 9740 LSAN DA 14 CA
— 323-878 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 14 CA
— 323-879 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PACIFIC BELL 9740 LSAN DA 13 CA
— 323-881 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 05 CA
— 323-882 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 14 CA
— 323-883 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 14 CA
— 323-885 1XXX2XXX3XXX6XXX which blocks → UTILITY TELECOM GROUP, LLC - CA 9262 LSAN DA 03 CA
— 323-887 not yet reported which blocks → PACIFIC BELL 9740 MONTEBELLO CA
— 323-888 not yet reported which blocks → PACIFIC BELL 9740 MONTEBELLO CA
— 323-889 9XXX which blocks → PACIFIC BELL 9740 MONTEBELLO CA
— 323-890 6XXX which blocks → PACIFIC BELL 9740 MONTEBELLO CA
— 323-896 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LSAN DA 14 CA
— 323-898 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → PACIFIC BELL 9740 LSAN DA 14 CA
— 323-900 0XXX5XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 LSAN DA 13 CA
— 323-902 0XXX1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LSAN DA 11 CA
— 323-903 1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LSAN DA 12 CA
— 323-904 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LSAN DA 13 CA
— 323-905 0XXX2XXX3XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LSAN DA 09 CA
— 323-906 4XXX5XXX6XXX7XXX · 2 holders which blocks → PACIFIC BELL 9740 LSAN DA 02 CA
— 323-907 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 LSAN DA 06 CA
— 323-908 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 08 CA
— 323-909 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 LSAN DA 04 CA
— 323-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 323-912 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 02 CA
— 323-913 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 02 CA
— 323-916 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LSAN DA 03 CA
— 323-919 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LSAN DA 06 CA
— 323-921 0–9 XXXwhole prefix which blocks → METROPCS NETWORKS, LLC 899D LSAN DA 02 CA
— 323-922 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C LSAN DA 02 CA
— 323-923 6XXX7XXX8XXX · 2 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LSAN DA 06 CA
— 323-924 0XXX3XXX4XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 12 CA
— 323-927 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - CA 649C LSAN DA 11 CA
— 323-928 0–9 XXXall 10 · 4 holders which blocks → METROPCS NETWORKS, LLC 899D LSAN DA 02 CA
— 323-930 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 13 CA

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.