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 209
COMCAST PHONE OF CALIFORNIA, LLC 18
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
2020-09-22 209-792 0–9 XXXall 10 · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L STOCKTON CA
2020-09-22 209-859 0–9 XXXall 10 · 3 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L MODESTO CA
2015-03-20 209-422 0–9 XXXall 10 · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L MODESTO CA
2007-07-02 209-408 0–9 XXXall 10 · 3 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L MODESTO CA
2006-07-26 209-846 0–9 XXXall 10 · 6 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L MODESTO CA
2006-06-28 209-594 0–9 XXXall 10 · 3 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L STOCKTON CA
— 209-217 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L JACKSON CA
— 209-224 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L LODI CA
— 209-243 2XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L NEWMAN CA
— 209-322 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L OAKDALE CA
— 209-349 1XXX2XXX4XXX8XXX9XXX · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L MERCED CA
— 209-432 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SNRA JUNO CA
— 209-498 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SANANDREAS CA
— 209-580 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L MERCED CA
— 209-680 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L PLYMOUTH CA
— 209-710 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L LOS BANOS CA
— 209-879 1XXX2XXX3XXX8XXX9XXX · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L TRACY CA
— 209-920 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L VALLEY SPG 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.