NumberResearch Membership · Data 09/26/2026

Recent prefix assignments

341 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 26
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 22
ONVOY, LLC - CA 21
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
— 650-638 8XXX which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-641 2XXX5XXX6XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MT VIEW CA
— 650-642 2XXX3XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SAN MATEO CA
— 650-644 4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PALO ALTO CA
— 650-645 0XXX1XXX3XXX6XXX7XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SAN MATEO CA
— 650-646 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 PALO ALTO CA
— 650-648 2XXX3XXX4XXX6XXX7XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MILLBRAE CA
— 650-649 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - CA 649C REDWOOD CY CA
— 650-651 4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 MILLBRAE CA
— 650-652 8XXX which blocks → PACIFIC BELL 9740 MILLBRAE CA
— 650-653 1XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SAN MATEO CA
— 650-654 8XXX which blocks → PACIFIC BELL 9740 SNCRL-BLMT CA
— 650-655 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-662 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → HD CARRIER LLC 321J LA HONDA CA
— 650-666 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PALO ALTO CA
— 650-670 1XXX3XXX4XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - CA 649C REDWOOD CY CA
— 650-678 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SAN MATEO CA
— 650-679 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → ASTOUND BROADBAND, LLC - CA 485E REDWOOD CY CA
— 650-681 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J PALO ALTO CA
— 650-682 0XXX1XXX2XXX3XXX4XXX5XXX which blocks → UTILITY TELECOM GROUP, LLC - CA 9262 PALO ALTO CA
— 650-683 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 WOODSIDE CA
— 650-684 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MILLBRAE CA
— 650-685 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-686 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MILLBRAE CA
— 650-687 7XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 PALO ALTO CA
— 650-688 5XXX which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-689 0XXX1XXX3XXX4XXX7XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 MILLBRAE CA
— 650-690 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → AT&T - LOCAL 7421 PALO ALTO CA
— 650-691 3XXX5XXX8XXX · 2 holders which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-692 not yet reported which blocks → PACIFIC BELL 9740 MILLBRAE CA
— 650-693 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 MT VIEW CA
— 650-694 8XXX9XXX · 2 holders which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-696 0XXX which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-697 not yet reported which blocks → PACIFIC BELL 9740 MILLBRAE CA
— 650-700 not yet reported which blocks → CA
— 650-701 3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-702 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 732J PALO ALTO CA
— 650-703 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SAN MATEO CA
— 650-704 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PALO ALTO CA
— 650-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 650-712 not yet reported which blocks → PACIFIC BELL 9740 HALFMOONBY CA
— 650-713 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HALFMOONBY CA
— 650-714 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PALO ALTO CA
— 650-716 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 REDWOOD CY CA
— 650-718 1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 MOSS BEACH CA
— 650-719 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 MOSS BEACH CA
— 650-720 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HALFMOONBY CA
— 650-721 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PALO ALTO CA
— 650-722 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 REDWOOD CY CA
— 650-723 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PALO ALTO 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.