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 949
COMCAST PHONE OF CALIFORNIA, LLC 29
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
2018-12-19 949-503 0–9 XXXall 10 · 3 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L CAPITRNVLY CA
2017-10-02 949-401 0–9 XXXall 10 · 5 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L RNCHOVIEJO CA
2017-09-19 949-317 0–9 XXXall 10 · 6 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SADLBK VLY CA
— 949-215 not yet reported which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SADLBK VLY CA
— 949-216 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L TRABUCO CA
— 949-218 0XXX1XXX2XXX3XXX which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L CAPITRNVLY CA
— 949-305 not yet reported which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SADLBK VLY CA
— 949-333 0–9 XXXall 10 · 5 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L IRVINE CA
— 949-387 not yet reported which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L IRVINE CA
— 949-388 not yet reported which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L CAPITRNVLY CA
— 949-398 0–9 XXXall 10 · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L IRVINE CA
— 949-404 0–9 XXXall 10 · 6 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L IRVINE CA
— 949-430 0–9 XXXall 10 · 6 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L IRVINE CA
— 949-446 0–9 XXXall 10 · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SADLBK VLY CA
— 949-481 not yet reported which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L CAPITRNVLY CA
— 949-501 0–9 XXXall 10 · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L IRVINE CA
— 949-502 0–9 XXXall 10 · 5 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L IRVINE CA
— 949-518 0–9 XXXall 10 · 3 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L IRVINE CA
— 949-546 1XXX3XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L TRABUCO CA
— 949-563 0–9 XXXall 10 · 3 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SADLBK VLY CA
— 949-600 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SADLBK VLY CA
— 949-619 0–9 XXXall 10 · 7 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SADLBK VLY CA
— 949-679 not yet reported which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L IRVINE CA
— 949-706 4XXX5XXX6XXX8XXX · 2 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L NEWPORTBCH CA
— 949-709 6XXX9XXX which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L TRABUCO CA
— 949-713 not yet reported which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L TRABUCO CA
— 949-715 4XXX5XXX8XXX which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L LAGUNA BCH CA
— 949-716 not yet reported which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SADLBK VLY CA
— 949-916 not yet reported which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SADLBK VLY 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.