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 978
COMCAST IP PHONE, LLC 23
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
2013-02-11 978-770 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J LOWELL MA
2004-11-17 978-496 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J WESTFORD MA
2001-05-29 978-769 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J GEORGETOWN MA
2001-03-19 978-208 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J LAWRENCE MA
— 978-207 2XXX3XXX4XXX7XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J NO READING MA
— 978-255 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J NEWBURYPT MA
— 978-258 not yet reported which blocks → COMCAST IP PHONE, LLC 318J LAWRENCE MA
— 978-304 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J DANVERS MA
— 978-312 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → COMCAST IP PHONE, LLC 318J IPSWICH MA
— 978-362 0XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J BILLERICA MA
— 978-409 0XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J ANDOVER MA
— 978-432 0XXX2XXX3XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J ROWLEY MA
— 978-447 0XXX2XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J WILMINGTON MA
— 978-455 not yet reported which blocks → COMCAST IP PHONE, LLC 318J LOWELL MA
— 978-510 0XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J W NEWBURY MA
— 978-561 2XXX3XXX4XXX6XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J TOPSFIELD MA
— 978-563 2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J STERLING MA
— 978-594 2XXX3XXX6XXX7XXX8XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J SALEM MA
— 978-626 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J HAMILTON MA
— 978-634 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J BOLTON MA
— 978-733 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J CLINTON MA
— 978-969 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J BEVERLY MA
— 978-984 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J LAWRENCE 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.