Recent prefix assignments

1 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 551

NEW CINGULAR WIRELESS PCS, LLC - DC 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
2023-11-09	551-385	0XXX1XXX6XXX · 2 holders which blocks →	CABLEVISION LIGHTPATH, INC. - NJ	4948	WYCKOFF	NJ
2023-10-16	551-525	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - NJ	637C	JERSEYCITY	NJ
2023-10-11	551-384	0–9 XXXall 10 · 4 holders which blocks →	OMNIPOINT COMMUNICATIONS, INC. - NJ	6623	UNION CITY	NJ
2023-09-21	551-379	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - NJ	637C	CLIFFSIDE	NJ
2023-09-21	551-380	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - NJ	637C	RUTHERFORD	NJ
2023-09-21	551-382	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - NJ	637C	ENGLEWOOD	NJ
2023-09-21	551-383	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - NJ	637C	ORADELL	NJ
2023-09-20	551-378	0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	OMNIPOINT COMMUNICATIONS, INC. - NJ	6623	CLIFFSIDE	NJ
2023-09-18	551-377	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - NJ	637C	UNION CITY	NJ
2023-09-11	551-376	0–9 XXXwhole prefix which blocks →	OMNIPOINT COMMUNICATIONS, INC. - NJ	6623	JERSEYCITY	NJ
2023-06-29	551-375	0–9 XXXall 10 · 3 holders which blocks →	OMNIPOINT COMMUNICATIONS, INC. - NJ	6623	UNION CITY	NJ
2023-05-24	551-374	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - NJ	637C	DUMONT	NJ
2023-03-23	551-364	0–9 XXXall 10 · 2 holders which blocks →	OMNIPOINT COMMUNICATIONS, INC. - NJ	6623	BAYONNE	NJ
2023-03-14	551-373	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - NJ	637C	UNION CITY	NJ
2023-03-01	551-372	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - NJ	637C	KEARNY	NJ
2023-02-09	551-371	0–9 XXXall 10 · 4 holders which blocks →	NUSO, LLC	732J	JERSEYCITY	NJ
2023-01-20	551-369	0–9 XXXall 10 · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - NJ	118F	TEANECK	NJ
2023-01-13	551-451	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - NJ	637C	CLIFFSIDE	NJ
2023-01-09	551-367	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ	6391	FAIR LAWN	NJ
2023-01-09	551-368	0–9 XXXall 10 · 2 holders which blocks →	OMNIPOINT COMMUNICATIONS, INC. - NJ	6623	HACKENSACK	NJ
2022-12-22	551-365	0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	KEARNY	NJ
2022-11-14	551-363	0–9 XXXall 10 · 3 holders which blocks →	NUSO, LLC	732J	BAYONNE	NJ
2022-11-09	551-362	0–9 XXXall 10 · 5 holders which blocks →	OMNIPOINT COMMUNICATIONS, INC. - NJ	6623	JERSEYCITY	NJ
2022-10-20	551-361	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - NJ	118F	HACKENSACK	NJ
2022-09-26	551-360	0–9 XXXall 10 · 2 holders which blocks →	BANDWIDTH.COM CLEC, LLC - NJ	118F	LEONIA	NJ
2022-09-02	551-357	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - NJ	637C	OAKLAND	NJ
2022-09-02	551-359	0–9 XXXall 10 · 4 holders which blocks →	OMNIPOINT COMMUNICATIONS, INC. - NJ	6623	JERSEYCITY	NJ
2022-08-11	551-553	0–9 XXXwhole prefix which blocks →	ONVOY, LLC - NJ	637C	ORADELL	NJ
2022-08-01	551-354	0–9 XXXall 10 · 4 holders which blocks →	BOOST SUBSCRIBERCO L.L.C.	490J	HACKENSACK	NJ
2022-07-21	551-353	0–9 XXXall 10 · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - NJ	118F	JERSEYCITY	NJ
2022-07-08	551-352	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ	6391	HACKENSACK	NJ
2022-06-14	551-350	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - NJ	637C	JERSEYCITY	NJ
2022-03-21	551-550	0–9 XXXwhole prefix which blocks →	ONVOY, LLC - NJ	637C	JERSEYCITY	NJ
2022-03-04	551-727	0–9 XXXall 10 · 3 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	BAYONNE	NJ
2022-03-04	551-799	0–9 XXXall 10 · 3 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	UNION CITY	NJ
2022-03-03	551-966	0–9 XXXall 10 · 4 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	FAIR LAWN	NJ
2022-03-01	551-733	0–9 XXXall 10 · 5 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	RIDGEWOOD	NJ
2022-03-01	551-766	0–9 XXXall 10 · 3 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	RUTHERFORD	NJ
2022-02-24	551-588	0–9 XXXall 10 · 5 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	RAMSEY	NJ
2022-02-24	551-788	0–9 XXXall 10 · 3 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	PARK RIDGE	NJ
2022-02-18	551-688	0–9 XXXall 10 · 4 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	LEONIA	NJ
2022-02-04	551-866	0–9 XXXall 10 · 6 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	CLIFFSIDE	NJ
2022-01-28	551-349	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ	6391	JERSEYCITY	NJ
2022-01-27	551-343	0–9 XXXall 10 · 2 holders which blocks →	OMNIPOINT COMMUNICATIONS, INC. - NJ	6623	BAYONNE	NJ
2022-01-27	551-344	0–9 XXXall 10 · 2 holders which blocks →	OMNIPOINT COMMUNICATIONS, INC. - NJ	6623	JERSEYCITY	NJ
2022-01-27	551-346	0–9 XXXall 10 · 4 holders which blocks →	OMNIPOINT COMMUNICATIONS, INC. - NJ	6623	CLOSTER	NJ
2022-01-27	551-347	0–9 XXXall 10 · 3 holders which blocks →	OMNIPOINT COMMUNICATIONS, INC. - NJ	6623	UNION CITY	NJ
2021-12-06	551-339	0–9 XXXwhole prefix which blocks →	OMNIPOINT COMMUNICATIONS, INC. - NJ	6623	BAYONNE	NJ
2021-12-06	551-341	0–9 XXXall 10 · 4 holders which blocks →	OMNIPOINT COMMUNICATIONS, INC. - NJ	6623	FAIR LAWN	NJ
2021-12-06	551-342	0–9 XXXwhole prefix which blocks →	OMNIPOINT COMMUNICATIONS, INC. - NJ	6623	UNION CITY	NJ

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.