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 650
TELEPORT COMMUNICATIONS AMERICA, LLC - CA 26
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
2023-06-02 650-760 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SSNFRNCSCO CA
2020-08-28 650-540 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SSNFRNCSCO CA
2018-12-17 650-414 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 REDWOOD CY CA
2015-08-31 650-546 0–9 XXXall 10 · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 PALO ALTO CA
2011-09-13 650-258 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 PALO ALTO CA
— 650-316 0XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 MT VIEW CA
— 650-383 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 LOS ALTOS CA
— 650-384 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 PALO ALTO CA
— 650-385 1XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 REDWOOD CY CA
— 650-386 0XXX1XXX7XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 MT VIEW CA
— 650-488 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SNFC JUNPR CA
— 650-530 0XXX1XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 WOODSIDE CA
— 650-581 0XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SAN MATEO CA
— 650-645 0XXX1XXX3XXX6XXX7XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SAN MATEO CA
— 650-689 0XXX1XXX3XXX4XXX7XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 MILLBRAE CA
— 650-693 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 MT VIEW CA
— 650-718 1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 MOSS BEACH CA
— 650-729 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 HALFMOONBY CA
— 650-735 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 PACIFICA CA
— 650-745 5XXX6XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SSNFRNCSCO CA
— 650-748 1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 LA HONDA CA
— 650-779 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 REDWOOD CY CA
— 650-798 4XXX7XXX9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 PALO ALTO CA
— 650-801 2XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SNCRL-BLMT CA
— 650-821 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SSNFRNCSCO CA
— 650-881 1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 PESCADERO 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.