NumberResearch Membership · Data 09/26/2026

Recent prefix assignments

360 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026

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
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - IL 26
Rogers Communications Canada Inc. (Wireless) 23
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
— 661-615 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 BKFD NORTH CA
— 661-616 7XXX8XXX which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 BKFD MAIN CA
— 661-617 0XXX2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 BKFD SOUTH CA
— 661-618 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PLDL PLDL CA
— 661-619 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
— 661-620 not yet reported which blocks → NORTH COUNTY COMMUNICATION CORPORATION - CA 7894 SNCA SGCC CA
— 661-621 0–9 XXXall 10 · 5 holders which blocks → METROPCS NETWORKS, LLC 899D SNCA SGCC CA
— 661-622 2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 PLDL LNVY CA
— 661-623 7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TAFT CA
— 661-626 not yet reported which blocks → CA
— 661-628 not yet reported which blocks → CA
— 661-630 0–9 XXXall 10 · 7 holders which blocks → BHN IP ENABLED SERVICES, LLC 045L SHAFTER CA
— 661-631 not yet reported which blocks → PACIFIC BELL 9740 BKFD MAIN CA
— 661-632 6XXX which blocks → PACIFIC BELL 9740 BKFD MAIN CA
— 661-633 4XXX which blocks → PACIFIC BELL 9740 BKFD MAIN CA
— 661-634 5XXX8XXX · 2 holders which blocks → PACIFIC BELL 9740 BKFD MAIN CA
— 661-635 not yet reported which blocks → PACIFIC BELL 9740 BKFD MAIN CA
— 661-636 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PACIFIC BELL 9740 BKFD MAIN CA
— 661-637 3XXX5XXX6XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 BKFD MAIN CA
— 661-638 3XXX6XXX8XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 BKFD MAIN CA
— 661-641 1XXX4XXX · 2 holders which blocks → SKYE TELECOM LLC DBA SKYETEL 622J EDWARDS CA
— 661-644 7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNCA NHCS CA
— 661-645 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNCA NHCS CA
— 661-650 not yet reported which blocks → CA
— 661-654 1XXX9XXX · 2 holders which blocks → PACIFIC BELL 9740 BKFD SOUTH CA
— 661-657 not yet reported which blocks → CA
— 661-661 not yet reported which blocks → CA
— 661-663 not yet reported which blocks → PACIFIC BELL 9740 BKFD SOUTH CA
— 661-664 not yet reported which blocks → PACIFIC BELL 9740 BKFD SOUTH CA
— 661-665 6XXX which blocks → PACIFIC BELL 9740 BKFD SOUTH CA
— 661-666 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C SNCA NHCS CA
— 661-667 2XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → METROPCS, INC. 5562 MCFARLAND CA
— 661-668 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 EARLIMART CA
— 661-670 0–9 XXXall 10 · 6 holders which blocks → METROPCS NETWORKS, LLC 899D SNCA NHCS CA
— 661-673 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → IP HORIZON LLC 515J SNCA SGCC CA
— 661-674 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 LANCASTER CA
— 661-675 3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PLDL PLDL CA
— 661-678 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → AT&T - LOCAL 7421 SNCA NHCS CA
— 661-689 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CLFRNHTSPG CA
— 661-694 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NUSO, LLC 732J BKFD NORTH CA
— 661-699 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD SOUTH CA
— 661-700 not yet reported which blocks → CA
— 661-702 4XXX which blocks → PACIFIC BELL 9740 SNCA NHCS CA
— 661-703 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BKFD MAIN CA
— 661-704 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MCKITTRICK CA
— 661-706 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BKFD MAIN CA
— 661-707 not yet reported which blocks → CA
— 661-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 661-713 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNCA NHCS CA
— 661-714 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNCA NHCS CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.