Recent prefix assignments

2 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, last 30 days — NPA 309

ONVOY, LLC 1

AHOI LLC 1

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
2003-07-30	309-550	0–9 XXXall 10 · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL	7196	PEORIA	IL
2003-07-28	309-574	1XXX3XXX8XXX9XXX · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	ALEDO	IL
2003-05-20	309-539	5XXX which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	HAMPTON	IL
2003-01-24	309-536	3XXX6XXX7XXX9XXX · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	MONMOUTH	IL
2003-01-17	309-505	1XXX5XXX7XXX8XXX9XXX · 3 holders which blocks →	ONVOY, LLC	224C	SUNNYLAND	IL
2003-01-16	309-502	0XXX1XXX2XXX3XXX7XXX8XXX · 3 holders which blocks →	T-MOBILE USA, INC.	6529	GENESEO	IL
2003-01-02	309-485	1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks →	MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL	846F	HUDSON	IL
2003-01-02	309-487	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL	846F	DOWNS	IL
2003-01-02	309-488	1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks →	MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL	846F	FARMERCITY	IL
2003-01-02	309-490	0–9 XXXall 10 · 7 holders which blocks →	MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL	846F	LEXINGTON	IL
2003-01-02	309-491	1XXX4XXX8XXX9XXX · 2 holders which blocks →	MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL	846F	MCLEAN	IL
2003-01-02	309-498	0–9 XXXall 10 · 7 holders which blocks →	MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL	846F	HEYWORTH	IL
2003-01-02	309-499	1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL	846F	LE ROY	IL
2003-01-02	309-501	0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks →	T-MOBILE USA, INC.	6529	WASHINGTON	IL
2002-10-18	309-207	2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	ILLINOISCY	IL
2002-10-16	309-220	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC	224C	WASHBURN	IL
2002-10-16	309-228	0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 8 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	FARMINGTON	IL
2002-10-16	309-240	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	ONVOY, LLC	224C	DUNLAP	IL
2002-10-16	309-250	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	ONVOY, LLC	224C	EDELSTEIN	IL
2002-10-16	309-270	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IL	984E	CHILLICOTH	IL
2002-10-16	309-290	1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks →	ONVOY, LLC	224C	MINERAL	IL
2002-10-16	309-291	1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IL	984E	MORTON	IL
2002-10-16	309-301	0XXX1XXX2XXX3XXX5XXX6XXX7XXX · 3 holders which blocks →	ONVOY, LLC	224C	TOULON	IL
2002-10-16	309-354	1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	ONVOY, LLC	224C	MACKINAW	IL
2002-10-16	309-356	1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	ONVOY, LLC	224C	HENRY	IL
2002-10-16	309-395	1XXX3XXX5XXX7XXX8XXX9XXX · 6 holders which blocks →	ONVOY, LLC	224C	GROVELAND	IL
2002-10-16	309-396	1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	ONVOY, LLC	224C	PRINCEVL	IL
2002-10-16	309-398	2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks →	ONVOY, LLC	224C	LA ROSE	IL
2002-10-16	309-440	1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks →	ONVOY, LLC	224C	DEER CREEK	IL
2002-10-16	309-442	0–9 XXXall 10 · 7 holders which blocks →	ONVOY, LLC	224C	BRIMFIELD	IL
2002-10-16	309-450	1XXX2XXX3XXX4XXX5XXX9XXX · 3 holders which blocks →	ONVOY, LLC	224C	CONGERVL	IL
2002-10-16	309-455	1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks →	ONVOY, LLC	224C	HOPEDALE	IL
2002-10-16	309-460	1XXX2XXX3XXX5XXX8XXX · 3 holders which blocks →	ONVOY, LLC	224C	LOW POINT	IL
2002-10-16	309-461	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks →	ONVOY, LLC	224C	MINONK	IL
2002-10-16	309-466	1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks →	ONVOY, LLC	224C	EUREKA	IL
2002-10-16	309-474	1XXX2XXX4XXX7XXX8XXX · 3 holders which blocks →	ONVOY, LLC	224C	VARNA	IL
2002-10-16	309-480	1XXX4XXX7XXX8XXX · 3 holders which blocks →	ONVOY, LLC	224C	CASTLETON	IL
2002-10-16	309-481	1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	WASHINGTON	IL
2002-10-16	309-492	2XXX3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks →	ONVOY, LLC	224C	CAMPGROVE	IL
2002-10-16	309-580	0XXX1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks →	ONVOY, LLC	224C	MOSSVILLE	IL
2002-10-16	309-595	5XXX7XXX9XXX · 2 holders which blocks →	ONVOY, LLC	224C	NEPONSET	IL
2002-10-16	309-670	not yet reported which blocks →	BANDWIDTH.COM CLEC, LLC - IL	984E	PEORIA	IL
2002-10-16	309-702	2XXX3XXX9XXX · 2 holders which blocks →	ONVOY, LLC	224C	WYOMING	IL
2002-10-16	309-739	1XXX2XXX3XXX7XXX8XXX9XXX · 6 holders which blocks →	MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL	846F	SECOR	IL
2002-10-16	309-741	1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks →	ONVOY, LLC	224C	ELMWOOD	IL
2002-10-16	309-818	7XXX8XXX9XXX which blocks →	ONVOY SPECTRUM, LLC	624H	BLOOMINGTN	IL
2002-10-16	309-851	none assigned yet which blocks →	FRONTIER NORTH, INC. - IL	1015	KEWANEE	IL
2002-10-16	309-894	1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 6 holders which blocks →	ONVOY, LLC	224C	BUDA	IL
2002-10-16	309-898	1XXX3XXX7XXX8XXX · 3 holders which blocks →	ONVOY, LLC	224C	BRADFORD	IL
2002-10-16	309-899	2XXX8XXX9XXX · 2 holders which blocks →	ONVOY, LLC	224C	ELMIRA	IL

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.