NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 337
COMCAST IP PHONE, LLC 22
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
2017-12-14 337-361 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 8 holders which blocks → COMCAST IP PHONE, LLC 318J ERATH LA
2017-12-14 337-398 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J CROWLEY LA
2017-12-05 337-283 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J ABBEVILLE LA
— 337-253 not yet reported which blocks → COMCAST IP PHONE, LLC 318J NEW IBERIA LA
— 337-285 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J KAPLAN LA
— 337-412 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J LAFAYETTE LA
— 337-434 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J HENDERSON LA
— 337-442 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J BREAUX BDG LA
— 337-444 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J PARKS LA
— 337-445 0–9 XXXall 10 · 7 holders which blocks → COMCAST IP PHONE, LLC 318J BROUSSARD LA
— 337-449 0XXX1XXX4XXX7XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J ARNAUDVL LA
— 337-451 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J YOUNGSVL LA
— 337-454 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J CECELIA LA
— 337-456 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → COMCAST IP PHONE, LLC 318J LAFAYETTE LA
— 337-490 0XXX3XXX7XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J DELCAMBRE LA
— 337-504 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J LAFAYETTE LA
— 337-524 0XXX1XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J LAFAYETTE LA
— 337-565 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J CARENCRO LA
— 337-907 0XXX3XXX4XXX6XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J FRANKLIN LA
— 337-918 0–9 XXXall 10 · 8 holders which blocks → COMCAST IP PHONE, LLC 318J ERATH LA
— 337-935 0–9 XXXall 10 · 8 holders which blocks → COMCAST IP PHONE, LLC 318J DUSON LA
— 337-944 0–9 XXXall 10 · 7 holders which blocks → COMCAST IP PHONE, LLC 318J LOREAUVL LA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.