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 515

MCC TELEPHONY OF IOWA, LLC - IA 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

Recent NPA-NXX prefix assignments
Assigned	NPA-NXX	Thousands-blocks taken (last-4 opening)	Code holder	OCN	Rate center	State
2023-05-09	515-307	0XXX1XXX3XXX · 3 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	WILLIAMS	IA
2018-03-09	515-630	0–9 XXXall 10 · 2 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	DES MOINES	IA
2017-11-22	515-214	0–9 XXXall 10 · 2 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	DES MOINES	IA
2013-03-21	515-330	0–9 XXXall 10 · 4 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	DES MOINES	IA
2012-07-23	515-207	0–9 XXXall 10 · 2 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	DES MOINES	IA
2010-04-16	515-765	1XXX5XXX · 2 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	BANCROFT	IA
2010-03-10	515-653	1XXX3XXX · 2 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	BURT	IA
2010-03-08	515-216	0–9 XXXall 10 · 5 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	DES MOINES	IA
2010-03-08	515-260	0XXX1XXX · 2 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	MOORLAND	IA
2010-03-08	515-412	0–9 XXXall 10 · 6 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	DES MOINES	IA
2010-03-08	515-445	0XXX1XXX2XXX4XXX5XXX6XXX9XXX · 4 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	HUXLEY	IA
2010-03-08	515-493	0–9 XXXall 10 · 4 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	WINTERSET	IA
2010-03-08	515-497	0–9 XXXall 10 · 4 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	PRAIRIE CY	IA
2010-03-08	515-519	0–9 XXXall 10 · 3 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	RUNNELLS	IA
2010-03-08	515-589	0XXX1XXX5XXX8XXX · 4 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	WOODWARD	IA
2010-03-08	515-809	0–9 XXXall 10 · 4 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	DES MOINES	IA
2010-03-08	515-837	1XXX4XXX7XXX · 3 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	BARNUM	IA
2010-03-08	515-843	1XXX3XXX4XXX · 3 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	CLARE	IA
2010-03-08	515-850	0–9 XXXall 10 · 5 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	DES MOINES	IA
2010-02-16	515-528	0–9 XXXall 10 · 3 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	DES MOINES	IA
2006-10-23	515-456	1XXX4XXX5XXX · 3 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	BANCROFT	IA
2006-06-29	515-477	1XXX2XXX4XXX7XXX · 4 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	SWEA CITY	IA
—	515-481	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	PLEASANTVL	IA

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.