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
— 661-475 0XXX1XXX5XXX6XXX8XXX which blocks → ONVOY, LLC - CA 649C EDWARDS CA
— 661-478 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PLDL PLDL CA
— 661-491 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E BKFD SOUTH CA
— 661-495 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C SNCA NHCS CA
— 661-496 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BKFD MAIN CA
— 661-510 none assigned yet which blocks → METROPCS NETWORKS, LLC 899D SNCA NHCS CA
— 661-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 661-513 3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PACIFIC BELL 9740 SNCA SGCC CA
— 661-528 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ROSAMOND CA
— 661-529 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C BKFD SOUTH CA
— 661-530 not yet reported which blocks → CA
— 661-532 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → IP HORIZON LLC 515J BIG BUTTE CA
— 661-533 4XXX which blocks → PACIFIC BELL 9740 PLDL PLDL CA
— 661-536 2XXX3XXX4XXX5XXX6XXX9XXX · 2 holders which blocks → FRONTIER CALIFORNIA INC. 4420 GLENNVILLE CA
— 661-537 3XXX4XXX5XXX · 2 holders which blocks → PACIFIC BELL 9740 PLDL PLDL CA
— 661-538 not yet reported which blocks → PACIFIC BELL 9740 PLDL PLDL CA
— 661-540 3XXX which blocks → PACIFIC BELL 9740 PLDL PLDL CA
— 661-541 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
— 661-542 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C SNCA SGCC CA
— 661-547 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LANCASTER CA
— 661-548 2XXX3XXX4XXX7XXX8XXX · 4 holders which blocks → FRONTIER CALIFORNIA INC. 4420 CLFRNHTSPG CA
— 661-551 0XXX1XXX2XXX3XXX6XXX8XXX · 3 holders which blocks → ONVOY, LLC - CA 649C BERENDMESA CA
— 661-552 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → IP HORIZON LLC 515J EARLIMART CA
— 661-554 not yet reported which blocks → ONVOY, LLC - CA 649C SNCA NHCS CA
— 661-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST CA
— 661-557 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ARVIN CA
— 661-558 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C BKFD MAIN CA
— 661-559 not yet reported which blocks → CA
— 661-560 0–9 XXXall 10 · 7 holders which blocks → TWILIO INTERNATIONAL, INC. 506J WASCO CA
— 661-562 not yet reported which blocks → CA
— 661-565 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 BKFD MAIN CA
— 661-568 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 SNCA NHCS CA
— 661-572 not yet reported which blocks → PACIFIC BELL 9740 PLDL PLDL CA
— 661-574 5XXX which blocks → PACIFIC BELL 9740 PLDL PLDL CA
— 661-575 3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → PACIFIC BELL 9740 PLDL PLDL CA
— 661-577 0XXX1XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → METROPCS, INC. 5562 TAFT CA
— 661-584 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MOJAVE CA
— 661-586 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DELANO CA
— 661-587 not yet reported which blocks → PACIFIC BELL 9740 BKFD NORTH CA
— 661-588 not yet reported which blocks → PACIFIC BELL 9740 BKFD NORTH CA
— 661-589 not yet reported which blocks → PACIFIC BELL 9740 BKFD NORTH CA
— 661-591 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 GLENNVILLE CA
— 661-596 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J BKFD MAIN CA
— 661-599 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD SOUTH CA
— 661-600 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 SNCA NHCS CA
— 661-606 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ARVIN CA
— 661-607 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → PACIFIC BELL 9740 SNCA NHCS CA
— 661-609 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LANCASTER CA
— 661-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 661-613 2XXX3XXX · 2 holders which blocks → EXIANT COMMUNICATIONS LLC 114J EDWARDS 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.