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 805
FRONTIER CALIFORNIA INC. 140
PACIFIC BELL 115
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 100
NEW CINGULAR WIRELESS PCS, LLC 84
T-MOBILE USA, INC. 54
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
— 805-869 0–9 XXXall 10 · 6 holders which blocks → TELNYX LLC 073H SANBARBARA CA
— 805-870 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - CA 649C THOUSAOAKS CA
— 805-874 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PACIFIC BELL (COMPETITIVE) 7480 POINT MUGU CA
— 805-875 0XXX3XXX4XXX5XXX7XXX9XXX · 2 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 LOMPOC CA
— 805-876 0XXX2XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 MOORPARK CA
— 805-877 2XXX3XXX4XXX5XXX6XXX7XXX which blocks → UTILITY TELECOM GROUP, LLC - CA 9262 VNTRA EAST CA
— 805-878 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SANTAMARIA CA
— 805-879 not yet reported which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SANBARBARA CA
— 805-880 not yet reported which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SANBARBARA CA
— 805-881 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER CALIFORNIA INC. 2319 CARPINTRIA CA
— 805-882 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 SANBARBARA CA
— 805-883 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → ONVOY SPECTRUM, LLC 624H SANBARBARA CA
— 805-884 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 SANBARBARA CA
— 805-886 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SANBARBARA CA
— 805-888 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PISMOBEACH CA
— 805-889 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OXNARD CA
— 805-890 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OXNARD CA
— 805-892 0XXX1XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER CALIFORNIA INC. 2319 SANBARBARA CA
— 805-893 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 SANBARBARA CA
— 805-895 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SANBARBARA CA
— 805-896 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SANBARBARA CA
— 805-897 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 SANBARBARA CA
— 805-898 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 SANBARBARA CA
— 805-899 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 SANBARBARA CA
— 805-900 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CAYUCOS CA
— 805-901 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 VNTRA EAST CA
— 805-904 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 ARROYOGRND CA
— 805-905 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 THOUSAOAKS CA
— 805-906 2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 THOUSAOAKS CA
— 805-907 3XXX4XXX7XXX · 2 holders which blocks → METROPCS NETWORKS, LLC 899D THOUSAOAKS CA
— 805-908 0XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 THOUSAOAKS CA
— 805-909 3XXX4XXX5XXX6XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CAMBRIA CA
— 805-910 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CAMARILLO CA
— 805-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 805-912 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F BRADLEY CA
— 805-913 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 VNTRA EAST CA
— 805-914 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 CAMARILLO CA
— 805-915 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SIMIVALLEY CA
— 805-917 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F THOUSAOAKS CA
— 805-918 0XXX1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → AT&T ENTERPRISES, LLC 516C SATICOY CA
— 805-919 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 EL RIO CA
— 805-920 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → SKYE TELECOM LLC DBA SKYETEL 622J SOMIS CA
— 805-921 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER CALIFORNIA INC. 2319 SANTAPAULA CA
— 805-922 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 SANTAMARIA CA
— 805-924 3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PACIFIC BELL 9740 CAMBRIA CA
— 805-925 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 SANTAMARIA CA
— 805-926 3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CAMBRIA CA
— 805-927 9XXX which blocks → PACIFIC BELL 9740 CAMBRIA CA
— 805-928 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 SANTAMARIA CA
— 805-929 9XXX which blocks → PACIFIC BELL 9740 NIPOMO 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.