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 781
COMCAST IP PHONE, LLC 35
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
2001-09-05 781-806 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J SHARON MA
2001-02-22 781-609 0–9 XXXall 10 · 7 holders which blocks → COMCAST IP PHONE, LLC 318J WALTHAM MA
— 781-281 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J WOBURN MA
— 781-365 2XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J BURLINGTON MA
— 781-369 5XXX7XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J WINCHESTER MA
— 781-373 0XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J WALTHAM MA
— 781-374 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J HINGHAM MA
— 781-378 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J SCITUATE MA
— 781-400 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J NEEDHAM MA
— 781-435 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J STONEHAM MA
— 781-523 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → COMCAST IP PHONE, LLC 318J WHITMAN MA
— 781-558 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J SAUGUS MA
— 781-562 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J CANTON MA
— 781-587 2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J WAKEFIELD MA
— 781-605 4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J MALDEN MA
— 781-620 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J MELROSE MA
— 781-629 0XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J REVERE MA
— 781-675 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J NEEDHAM MA
— 781-686 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → COMCAST IP PHONE, LLC 318J DEDHAM MA
— 781-701 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J WALTHAM MA
— 781-772 2XXX3XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J WELLESLEY MA
— 781-773 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J HULL MA
— 781-777 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J ARLINGTON MA
— 781-779 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J READING MA
— 781-790 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J WALTHAM MA
— 781-807 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J RANDOLPH MA
— 781-812 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J WEYMOUTH MA
— 781-842 not yet reported which blocks → COMCAST IP PHONE, LLC 318J LYNN MA
— 781-874 3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J MEDFORD MA
— 781-875 3XXX7XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J HINGHAM MA
— 781-885 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J RANDOLPH MA
— 781-923 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J COHASSET MA
— 781-924 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → COMCAST IP PHONE, LLC 318J HANOVER MA
— 781-987 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J NORWELL MA
— 781-990 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J MARBLEHEAD MA

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.