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 313

ONVOY, LLCV - MI 25

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
2025-11-20	313-830	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLCV - MI	543C	DETROITZN5	MI
2023-06-20	313-435	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLCV - MI	543C	DETROITZN6	MI
2022-11-23	313-698	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLCV - MI	543C	DETROITZN3	MI
2021-11-24	313-504	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLCV - MI	543C	DETROITZN3	MI
2021-11-03	313-612	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLCV - MI	543C	DETROITZN1	MI
2021-07-07	313-572	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLCV - MI	543C	DETROITZN1	MI
2021-06-16	313-514	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLCV - MI	543C	DETROITZN4	MI
2020-09-08	313-998	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLCV - MI	543C	DETROITZN1	MI
2020-09-02	313-513	0–9 XXXwhole prefix which blocks →	ONVOY, LLCV - MI	543C	DETROITZN1	MI
2020-09-02	313-631	0–9 XXXwhole prefix which blocks →	ONVOY, LLCV - MI	543C	DETROITZN2	MI
2020-09-02	313-634	0–9 XXXwhole prefix which blocks →	ONVOY, LLCV - MI	543C	DETROITZN3	MI
2020-09-02	313-763	0–9 XXXwhole prefix which blocks →	ONVOY, LLCV - MI	543C	DETROITZN5	MI
2015-12-24	313-251	0–9 XXXwhole prefix which blocks →	ONVOY, LLCV - MI	543C	DETROITZN6	MI
2015-09-17	313-666	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLCV - MI	543C	DETROITZN6	MI
2015-08-12	313-800	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLCV - MI	543C	DETROITZN1	MI
2015-04-09	313-888	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLCV - MI	543C	DETROITZN1	MI
2015-02-18	313-777	0–9 XXXwhole prefix which blocks →	ONVOY, LLCV - MI	543C	DETROITZN3	MI
2013-09-19	313-307	0–9 XXXall 10 · 6 holders which blocks →	ONVOY, LLCV - MI	543C	DETROITZN4	MI
2012-02-08	313-241	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLCV - MI	543C	DETROITZN4	MI
2010-04-02	313-462	0–9 XXXall 10 · 6 holders which blocks →	ONVOY, LLCV - MI	543C	DETROITZN1	MI
2008-10-03	313-427	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLCV - MI	543C	DETROITZN6	MI
—	313-285	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLCV - MI	543C	DETROITZN1	MI
—	313-518	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLCV - MI	543C	DETROITZN5	MI
—	313-528	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLCV - MI	543C	DETROITZN6	MI
—	313-703	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLCV - MI	543C	DETROITZN5	MI

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.