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
PACIFIC BELL 273
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
— 650-780 3XXX6XXX which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-786 not yet reported which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-794 not yet reported which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-802 not yet reported which blocks → PACIFIC BELL 9740 SNCRL-BLMT CA
— 650-808 0XXX5XXX7XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-812 9XXX which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-813 2XXX3XXX · 2 holders which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-817 5XXX7XXX8XXX · 3 holders which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-827 5XXX which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-829 not yet reported which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-833 8XXX9XXX which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-837 0XXX1XXX3XXX6XXX · 3 holders which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-838 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-839 2XXX3XXX4XXX6XXX7XXX9XXX · 4 holders which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-842 0XXX which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-843 9XXX which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-845 2XXX7XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-846 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-849 8XXX which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-851 not yet reported which blocks → PACIFIC BELL 9740 WOODSIDE CA
— 650-852 1XXX8XXX · 2 holders which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-853 9XXX which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-854 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-855 4XXX which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-856 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-857 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-858 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-859 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-864 0XXX2XXX3XXX4XXX6XXX8XXX · 4 holders which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-866 0XXX1XXX5XXX8XXX9XXX · 5 holders which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-869 9XXX which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-871 not yet reported which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-872 9XXX which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-873 not yet reported which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-874 not yet reported which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-875 not yet reported which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-876 not yet reported which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-877 2XXX which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-878 6XXX7XXX · 2 holders which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-879 4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → PACIFIC BELL 9740 PESCADERO CA
— 650-903 7XXX which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-917 not yet reported which blocks → PACIFIC BELL 9740 LOS ALTOS CA
— 650-919 3XXX4XXX8XXX · 2 holders which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-926 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-932 not yet reported which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-933 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-934 1XXX2XXX9XXX · 2 holders which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-937 9XXX which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-938 5XXX which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-940 2XXX which blocks → PACIFIC BELL 9740 MT VIEW 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.