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 717

COMCAST IP PHONE, LLC 27

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

Recent NPA-NXX prefix assignments
Assigned	NPA-NXX	Thousands-blocks taken (last-4 opening)	Code holder	OCN	Rate center	State
2024-04-25	717-223	2XXX3XXX7XXX8XXX · 3 holders which blocks →	COMCAST IP PHONE, LLC	318J	STEWARTSTN	PA
2016-10-25	717-251	0–9 XXXall 10 · 5 holders which blocks →	COMCAST IP PHONE, LLC	318J	CHAMBERSBG	PA
2016-07-22	717-906	0–9 XXXall 10 · 6 holders which blocks →	COMCAST IP PHONE, LLC	318J	CARLISLE	PA
2015-11-12	717-857	0–9 XXXall 10 · 8 holders which blocks →	COMCAST IP PHONE, LLC	318J	HARISBGZN1	PA
2015-08-26	717-660	0–9 XXXall 10 · 7 holders which blocks →	COMCAST IP PHONE, LLC	318J	CHAMBERSBG	PA
2014-08-11	717-984	0–9 XXXall 10 · 4 holders which blocks →	COMCAST IP PHONE, LLC	318J	LANCASTER	PA
2013-06-17	717-969	0–9 XXXall 10 · 8 holders which blocks →	COMCAST IP PHONE, LLC	318J	HANOVER	PA
2011-10-11	717-942	0–9 XXXall 10 · 7 holders which blocks →	COMCAST IP PHONE, LLC	318J	GLEN ROCK	PA
2008-10-15	717-488	0–9 XXXall 10 · 9 holders which blocks →	COMCAST IP PHONE, LLC	318J	TERRE HILL	PA
2008-10-15	717-923	0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	COMCAST IP PHONE, LLC	318J	RAWLINSVL	PA
2008-10-15	717-955	0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	COMCAST IP PHONE, LLC	318J	HENSEL	PA
2008-10-10	717-613	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	COMCAST IP PHONE, LLC	318J	KIRKWOOD	PA
2008-10-10	717-929	0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 7 holders which blocks →	COMCAST IP PHONE, LLC	318J	INTERCOURS	PA
2008-10-09	717-952	0XXX1XXX2XXX3XXX5XXX6XXX7XXX9XXX · 7 holders which blocks →	COMCAST IP PHONE, LLC	318J	MILLERSBG	PA
2008-10-08	717-822	not yet reported which blocks →	COMCAST IP PHONE, LLC	318J	LEWISBERRY	PA
2008-02-05	717-454	0–9 XXXall 10 · 6 holders which blocks →	COMCAST IP PHONE, LLC	318J	LEBANON	PA
2007-11-08	717-457	not yet reported which blocks →	COMCAST IP PHONE, LLC	318J	FAIRFIELD	PA
2007-07-25	717-416	not yet reported which blocks →	COMCAST IP PHONE, LLC	318J	YORK SPG	PA
2007-06-27	717-945	0–9 XXXall 10 · 4 holders which blocks →	COMCAST IP PHONE, LLC	318J	LANCASTER	PA
2007-06-26	717-885	0–9 XXXall 10 · 6 holders which blocks →	COMCAST IP PHONE, LLC	318J	YORK	PA
2006-12-28	717-407	0–9 XXXall 10 · 7 holders which blocks →	COMCAST IP PHONE, LLC	318J	GAP	PA
2006-06-29	717-522	0–9 XXXall 10 · 8 holders which blocks →	COMCAST IP PHONE, LLC	318J	MOUNTVILLE	PA
2006-06-29	717-604	0XXX1XXX2XXX3XXX4XXX7XXX9XXX · 6 holders which blocks →	COMCAST IP PHONE, LLC	318J	MARIETTA	PA
2006-06-27	717-498	not yet reported which blocks →	COMCAST IP PHONE, LLC	318J	MERCERSBG	PA
2006-06-27	717-595	not yet reported which blocks →	COMCAST IP PHONE, LLC	318J	ST THOMAS	PA
2006-06-27	717-643	not yet reported which blocks →	COMCAST IP PHONE, LLC	318J	GREENCASTL	PA
2006-05-18	717-695	0–9 XXXall 10 · 4 holders which blocks →	COMCAST IP PHONE, LLC	318J	HARISBGZN1	PA

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.