Recent prefix assignments

349 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/24/2026

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

8X8, INC. 43

NEW CINGULAR WIRELESS PCS, LLC - DC 31

ONVOY, LLC - CA 27

NEW CINGULAR WIRELESS PCS, LLC - IL 27

ONVOY, LLC - NJ 15

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
—	860-277	not yet reported which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	HARTFORD	CT
—	860-278	6XXX9XXX · 2 holders which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	HARTFORD	CT
—	860-279	not yet reported which blocks →	AMERICAN MESSAGING SERVICES, LLC	9748	HARTFORD	CT
—	860-280	1XXX which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	HARTFORD	CT
—	860-281	0–9 XXXall 10 · 4 holders which blocks →	METROPCS, INC.	5562	MANCHESTER	CT
—	860-282	not yet reported which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	HARTFORD	CT
—	860-283	not yet reported which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	THOMASTON	CT
—	860-284	8XXX which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	FARMINGTON	CT
—	860-285	not yet reported which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	WINDSOR	CT
—	860-286	not yet reported which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	HARTFORD	CT
—	860-288	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CT	4800	MANCHESTER	CT
—	860-289	not yet reported which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	HARTFORD	CT
—	860-290	not yet reported which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	HARTFORD	CT
—	860-291	not yet reported which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	HARTFORD	CT
—	860-292	0XXX which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	WINDSORLKS	CT
—	860-293	not yet reported which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	HARTFORD	CT
—	860-294	0–9 XXXall 10 · 6 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	TORRINGTON	CT
—	860-295	2XXX3XXX4XXX5XXX7XXX · 4 holders which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	E HAMPTON	CT
—	860-296	not yet reported which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	HARTFORD	CT
—	860-297	1XXX7XXX · 2 holders which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	HARTFORD	CT
—	860-298	not yet reported which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	WINDSOR	CT
—	860-299	3XXX4XXX5XXX6XXX which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	HARTFORD	CT
—	860-301	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	MIDDLETOWN	CT
—	860-302	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	SOUTHINGTN	CT
—	860-303	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	NORWICH	CT
—	860-304	8XXX9XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	OLD SAYBRK	CT
—	860-305	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	HARTFORD	CT
—	860-306	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	HARTFORD	CT
—	860-307	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	HARWINTON	CT
—	860-308	0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	HARTFORD	CT
—	860-309	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	HARWINTON	CT
—	860-311	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	CT
—	860-312	not yet reported which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	NORWICH	CT
—	860-313	8XXX9XXX · 2 holders which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	HARTFORD	CT
—	860-314	not yet reported which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	BRISTOL	CT
—	860-315	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	PUTNAM	CT
—	860-316	0–9 XXXall 10 · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	MIDDLETOWN	CT
—	860-317	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	PLAINFIELD	CT
—	860-318	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	CORNWALL	CT
—	860-319	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	NORWICH	CT
—	860-320	not yet reported which blocks →	AMERICAN MESSAGING SERVICES, LLC	9748	HARTFORD	CT
—	860-321	0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	FARMINGTON	CT
—	860-322	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	DEEP RIVER	CT
—	860-323	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 9 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	SIMSBURY	CT
—	860-325	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	SIMSBURY	CT
—	860-326	0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CT	7143	NEW LONDON	CT
—	860-327	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	MANCHESTER	CT
—	860-329	0–9 XXXall 10 · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	SOUTHINGTN	CT
—	860-330	not yet reported which blocks →	SPOK, INC.	6630	HARTFORD	CT
—	860-331	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	HARTFORD	CT

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/24/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.