NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

2 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, last 30 days — NPA 650
ONVOY, LLC - CA 2
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
— 650-860 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PESCADERO CA
— 650-862 2XXX4XXX5XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PALO ALTO CA
— 650-863 2XXX3XXX4XXX5XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SAN MATEO CA
— 650-864 0XXX2XXX3XXX4XXX6XXX8XXX · 4 holders which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-866 0XXX1XXX5XXX8XXX9XXX · 5 holders which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-867 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SAN MATEO CA
— 650-868 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 REDWOOD CY CA
— 650-869 9XXX which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-870 5XXX7XXX8XXX9XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SSNFRNCSCO CA
— 650-871 not yet reported which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-872 9XXX which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-873 not yet reported which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-874 not yet reported which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-875 not yet reported which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-876 not yet reported which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-877 2XXX which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-878 6XXX7XXX · 2 holders which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-879 4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → PACIFIC BELL 9740 PESCADERO CA
— 650-881 1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 PESCADERO CA
— 650-882 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - CA 649C PESCADERO CA
— 650-887 4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - CA 649C LOS ALTOS CA
— 650-888 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SAN MATEO CA
— 650-889 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → IP HORIZON LLC 515J HALFMOONBY CA
— 650-892 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SSNFRNCSCO CA
— 650-897 3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MOSS BEACH CA
— 650-898 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L PACIFICA CA
— 650-899 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - CA 649C LA HONDA CA
— 650-900 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - CA 649C LOS ALTOS CA
— 650-903 7XXX which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-906 none assigned yet which blocks → METROPCS, INC. 5562 PALO ALTO CA
— 650-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 650-917 not yet reported which blocks → PACIFIC BELL 9740 LOS ALTOS CA
— 650-918 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → AT&T - LOCAL 7421 SAN MATEO CA
— 650-919 3XXX4XXX8XXX · 2 holders which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-924 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → METROPCS, INC. 5562 PALO ALTO CA
— 650-926 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-930 0XXX6XXX7XXX8XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MT VIEW CA
— 650-931 4XXX5XXX6XXX7XXX · 3 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SAN MATEO CA
— 650-932 not yet reported which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-933 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-934 1XXX2XXX9XXX · 2 holders which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-935 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LOS ALTOS CA
— 650-937 9XXX which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-938 5XXX which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-940 2XXX which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-941 not yet reported which blocks → PACIFIC BELL 9740 LOS ALTOS CA
— 650-943 0XXX3XXX6XXX8XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-944 9XXX which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-946 1XXX2XXX3XXX6XXX7XXX8XXX · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L LOS ALTOS CA
— 650-947 3XXX7XXX · 2 holders which blocks → PACIFIC BELL 9740 LOS ALTOS 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.