NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

2 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, last 30 days — NPA 650
ONVOY, LLC - CA 2
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
— 650-564 2XXX3XXX4XXX5XXX7XXX · 3 holders which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-565 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-566 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-567 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-568 not yet reported which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-569 0XXX1XXX which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-570 none assigned yet which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-571 none assigned yet which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-572 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-573 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-574 9XXX which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-575 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PALO ALTO CA
— 650-576 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SAN MATEO CA
— 650-577 3XXX which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-578 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-579 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-580 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SSNFRNCSCO CA
— 650-581 0XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SAN MATEO CA
— 650-583 not yet reported which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-584 0XXX3XXX · 2 holders which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-585 0XXX3XXX5XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNCRL-BLMT CA
— 650-587 2XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 REDWOOD CY CA
— 650-588 not yet reported which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-589 not yet reported which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-590 4XXX6XXX9XXX · 2 holders which blocks → ONVOY, LLC - CA 649C SNCRL-BLMT CA
— 650-591 not yet reported which blocks → PACIFIC BELL 9740 SNCRL-BLMT CA
— 650-592 not yet reported which blocks → PACIFIC BELL 9740 SNCRL-BLMT CA
— 650-593 not yet reported which blocks → PACIFIC BELL 9740 SNCRL-BLMT CA
— 650-594 6XXX7XXX · 2 holders which blocks → PACIFIC BELL 9740 SNCRL-BLMT CA
— 650-595 6XXX which blocks → PACIFIC BELL 9740 SNCRL-BLMT CA
— 650-596 not yet reported which blocks → PACIFIC BELL 9740 SNCRL-BLMT CA
— 650-598 not yet reported which blocks → PACIFIC BELL 9740 SNCRL-BLMT CA
— 650-599 not yet reported which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-600 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CA 649C PALO ALTO CA
— 650-603 0XXX1XXX5XXX6XXX · 4 holders which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-604 not yet reported which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-605 3XXX5XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MT VIEW CA
— 650-607 not yet reported which blocks → PACIFIC BELL 9740 SNCRL-BLMT CA
— 650-610 1XXX2XXX7XXX which blocks → PACIFIC BELL 9740 SNCRL-BLMT CA
— 650-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 650-612 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-614 1XXX5XXX · 2 holders which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-615 not yet reported which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-616 not yet reported which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-617 5XXX which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-618 4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → ONVOY, LLC - CA 649C PALO ALTO CA
— 650-619 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SAN MATEO CA
— 650-620 0XXX1XXX4XXX7XXX8XXX · 3 holders which blocks → PACIFIC BELL 9740 SNCRL-BLMT CA
— 650-621 0XXX which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-622 2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PACIFIC BELL 9740 SNCRL-BLMT 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.