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
LEVEL 3 COMMUNICATIONS, LLC - CA 42
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
2019-03-22 650-514 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN MATEO CA
2017-06-27 650-885 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PALO ALTO CA
2016-06-10 650-836 0–9 XXXwhole prefix which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PESCADERO CA
2014-04-07 650-656 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PALO ALTO CA
2001-01-25 650-830 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNCRL-BLMT CA
— 650-215 0XXX1XXX3XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MT VIEW CA
— 650-241 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 REDWOOD CY CA
— 650-242 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN MATEO CA
— 650-257 0XXX2XXX3XXX4XXX6XXX7XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 REDWOOD CY CA
— 650-262 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PESCADERO CA
— 650-267 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SSNFRNCSCO CA
— 650-288 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN MATEO CA
— 650-292 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN MATEO CA
— 650-331 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PALO ALTO CA
— 650-332 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 WOODSIDE CA
— 650-351 0XXX2XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SSNFRNCSCO CA
— 650-352 3XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PALO ALTO CA
— 650-353 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PALO ALTO CA
— 650-376 0XXX3XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN MATEO CA
— 650-419 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LA HONDA CA
— 650-453 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNCRL-BLMT CA
— 650-472 5XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LOS ALTOS CA
— 650-489 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNCRL-BLMT CA
— 650-491 1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SSNFRNCSCO CA
— 650-497 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PALO ALTO CA
— 650-498 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PALO ALTO CA
— 650-515 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SSNFRNCSCO 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
— 650-641 2XXX5XXX6XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MT VIEW CA
— 650-666 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 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
— 650-721 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PALO ALTO CA
— 650-723 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PALO ALTO CA
— 650-724 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PALO ALTO CA
— 650-725 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PALO ALTO CA
— 650-736 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PALO ALTO CA
— 650-763 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SSNFRNCSCO CA
— 650-860 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PESCADERO CA
— 650-897 3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MOSS BEACH CA
— 650-989 1XXX5XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SSNFRNCSCO 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.