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 818
PACIFIC BELL 266
NEW CINGULAR WIRELESS PCS, LLC 73
T-MOBILE USA, INC. 71
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 63
FRONTIER CALIFORNIA INC. 37
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
— 818-596 not yet reported which blocks → PACIFIC BELL 9740 CANOGAPARK CA
— 818-597 not yet reported which blocks → PACIFIC BELL 9740 AGOURA CA
— 818-598 not yet reported which blocks → PACIFIC BELL 9740 CANOGAPARK CA
— 818-600 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C RESEDA CA
— 818-603 not yet reported which blocks → SPOK, INC. 6630 VAN NUYS CA
— 818-606 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 VAN NUYS CA
— 818-608 not yet reported which blocks → SPOK, INC. 6630 VAN NUYS CA
— 818-609 not yet reported which blocks → PACIFIC BELL 9740 RESEDA CA
— 818-610 9XXX which blocks → PACIFIC BELL 9740 CANOGAPARK CA
— 818-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 818-612 none assigned yet which blocks → T-MOBILE USA, INC. 6529 VAN NUYS CA
— 818-613 not yet reported which blocks → T-MOBILE USA, INC. 6529 LSAN DA 01 CA
— 818-615 not yet reported which blocks → PACIFIC BELL 9740 CANOGAPARK CA
— 818-618 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 VAN NUYS CA
— 818-621 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 VAN NUYS CA
— 818-622 not yet reported which blocks → PACIFIC BELL 9740 NO HOLLYWD CA
— 818-623 not yet reported which blocks → PACIFIC BELL 9740 NO HOLLYWD CA
— 818-624 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 VAN NUYS CA
— 818-625 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 VAN NUYS CA
— 818-627 0XXX1XXX2XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 GLENDALE CA
— 818-628 not yet reported which blocks → 33 WIRELESS INC. 6967 BRBN BRBN CA
— 818-630 3XXX4XXX5XXX9XXX · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J GLENDALE CA
— 818-631 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 VAN NUYS CA
— 818-632 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 VAN NUYS CA
— 818-634 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 VAN NUYS CA
— 818-635 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 VAN NUYS CA
— 818-636 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BRBN BRBN CA
— 818-637 not yet reported which blocks → PACIFIC BELL 9740 GLENDALE CA
— 818-638 1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 GLENDALE CA
— 818-639 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C SNFN SNFN CA
— 818-640 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BRBN BRBN CA
— 818-642 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 VAN NUYS CA
— 818-644 0XXX1XXX2XXX3XXX5XXX7XXX9XXX · 2 holders which blocks → PACIFIC BELL 9740 VAN NUYS CA
— 818-645 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 VAN NUYS CA
— 818-647 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → MATRIX TELECOM, LLC. S/I/I TNCI - CA 7379 VAN NUYS CA
— 818-648 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 VAN NUYS CA
— 818-649 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 GLENDALE CA
— 818-651 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 AGOURA CA
— 818-652 none assigned yet which blocks → T-MOBILE USA, INC. 6529 VAN NUYS CA
— 818-653 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BRBN BRBN CA
— 818-654 4XXX6XXX7XXX8XXX · 3 holders which blocks → PACIFIC BELL 9740 RESEDA CA
— 818-655 0XXX which blocks → PACIFIC BELL 9740 NO HOLLYWD CA
— 818-656 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 GLENDALE CA
— 818-657 0XXX1XXX2XXX7XXX8XXX9XXX · 6 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CANOGAPARK CA
— 818-658 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 LACRSCENTA CA
— 818-659 0–9 XXXall 10 · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J PSDN LACN CA
— 818-660 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 GLENDALE CA
— 818-661 0XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 AGOURA CA
— 818-662 not yet reported which blocks → PACIFIC BELL 9740 GLENDALE CA
— 818-663 not yet reported which blocks → 33 WIRELESS INC. 6967 VAN NUYS 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.