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 540
COMCAST IP PHONE, LLC 21
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
2021-09-09 540-756 1XXX2XXX5XXX6XXX7XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J MADISON VA
2018-08-09 540-902 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J GREENWOOD VA
2017-10-05 540-702 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J CHANCELLOR VA
2015-06-08 540-755 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J CHANCELLOR VA
2014-02-27 540-699 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J STAFFORD VA
2014-01-17 540-388 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J CHANCELLOR VA
2012-04-23 540-356 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J HARTWOOD VA
2011-12-20 540-217 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J HARRISONBG VA
2011-12-20 540-225 0–9 XXXall 10 · 9 holders which blocks → COMCAST IP PHONE, LLC 318J STANLEY VA
2011-12-02 540-732 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J UNIONVILLE VA
2010-06-01 540-508 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → COMCAST IP PHONE, LLC 318J STEPHENSCY VA
2008-08-29 540-628 0–9 XXXall 10 · 8 holders which blocks → COMCAST IP PHONE, LLC 318J STAFFORD VA
2007-09-13 540-404 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J SALEM VA
2004-06-09 540-237 0XXX1XXX2XXX3XXX4XXX6XXX7XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J BRIDGEWTR VA
2002-03-18 540-812 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J CULPEPER VA
2001-11-19 540-754 not yet reported which blocks → COMCAST IP PHONE, LLC 318J WINCHESTER VA
— 540-400 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J ROANOKE VA
— 540-479 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J FREDECKSBG VA
— 540-686 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J WINCHESTER VA
— 540-777 not yet reported which blocks → COMCAST IP PHONE, LLC 318J ROANOKE VA
— 540-901 0–9 XXXall 10 · 7 holders which blocks → COMCAST IP PHONE, LLC 318J BROADWAY VA

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.