Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026

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 424

T-MOBILE USA, INC. 74

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
2014-12-15	424-381	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	CMTN CMTN	CA
2014-11-10	424-392	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	REDONDO	CA
2014-10-17	424-376	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	TORRANCE	CA
2014-09-30	424-373	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	CMTN CMTN	CA
2014-09-15	424-364	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	SAN PEDRO	CA
2014-08-21	424-362	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	BEVERLYHLS	CA
2014-03-07	424-324	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	BEVERLYHLS	CA
2013-12-09	424-341	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	CULVERCITY	CA
2013-08-22	424-335	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	BEVERLYHLS	CA
2013-06-26	424-299	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	SNMN SNMN	CA
2013-06-17	424-321	0–9 XXXall 10 · 7 holders which blocks →	T-MOBILE USA, INC.	6529	EL SEGUNDO	CA
2013-05-16	424-332	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	BEVERLYHLS	CA
2012-12-14	424-287	0–9 XXXall 10 · 9 holders which blocks →	T-MOBILE USA, INC.	6529	SAN PEDRO	CA
2007-08-24	424-232	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	CMTN GRDN	CA
2007-08-23	424-230	0–9 XXXall 10 · 7 holders which blocks →	T-MOBILE USA, INC.	6529	BEVERLYHLS	CA
2007-02-24	424-217	0–9 XXXall 10 · 6 holders which blocks →	T-MOBILE USA, INC.	6529	EL SEGUNDO	CA
2007-02-15	424-216	0–9 XXXall 10 · 6 holders which blocks →	T-MOBILE USA, INC.	6529	SNMN MRVS	CA
2007-01-25	424-215	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	SAN PEDRO	CA
2006-12-21	424-213	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	T-MOBILE USA, INC.	6529	CMTN CMTN	CA
2006-12-18	424-210	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	SAN PEDRO	CA
2006-12-15	424-212	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	REDONDO	CA
2006-12-04	424-208	0–9 XXXall 10 · 6 holders which blocks →	T-MOBILE USA, INC.	6529	W ANGELES	CA
2006-03-30	424-901	0–9 XXXall 10 · 6 holders which blocks →	T-MOBILE USA, INC.	6529	W ANGELES	CA
—	424-382	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	BEVERLYHLS	CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.