Recent prefix assignments

334 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/28/2026

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 26

Rogers Communications Canada Inc. (Wireless) 23

NEW CINGULAR WIRELESS PCS, LLC - IL 22

ONVOY, LLC - CA 19

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
2016-10-31	385-434	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	MIDVALE	UT
2016-10-31	417-371	0–9 XXXall 10 · 2 holders which blocks →	PAETEC ITEL, LLC	829J	SPRINGFLD	MO
2016-10-31	431-721	not yet reported which blocks →	TELUS Integrated Communications	2782	Dauphin	—
2016-10-31	431-722	not yet reported which blocks →	TELUS Integrated Communications	2782	Melita	—
2016-10-31	431-723	not yet reported which blocks →	TELUS Integrated Communications	2782	Morris	—
2016-10-31	431-724	not yet reported which blocks →	TELUS Integrated Communications	2782	Swan River	—
2016-10-31	431-725	not yet reported which blocks →	TELUS Integrated Communications	2782	Thompson	—
2016-10-31	469-929	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - TX	6114	PLANO	TX
2016-10-31	480-508	0–9 XXXall 10 · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	PHOENIX	AZ
2016-10-28	267-832	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	NEWTOWN	PA
2016-10-28	270-648	0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 5 holders which blocks →	TWC IP ENABLED SERVICES, LLC	793K	PANTHER	KY
2016-10-28	309-513	0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 6 holders which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	ALEDO	IL
2016-10-28	440-870	0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 6 holders which blocks →	ONVOY, LLC - OH	464C	STRONGSVL	OH
2016-10-28	442-296	0XXX1XXX2XXX3XXX4XXX6XXX9XXX · 4 holders which blocks →	RACE TELECOMMUNICATIONS, INC. - CA	973E	CROWLEY LK	CA
2016-10-28	442-298	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks →	RACE TELECOMMUNICATIONS, INC. - CA	973E	TRONA	CA
2016-10-28	470-359	0–9 XXXall 10 · 3 holders which blocks →	COMCAST IP PHONE, LLC	318J	ATLANTA NE	GA
2016-10-28	628-257	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	RACE TELECOMMUNICATIONS, INC. - CA	973E	MILLVALLEY	CA
2016-10-28	650-865	0–9 XXXall 10 · 8 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	SAN MATEO	CA
2016-10-28	873-482	not yet reported which blocks →	ISP Telecom Inc.	4727	La Minerve	—
2016-10-28	873-483	not yet reported which blocks →	ISP Telecom Inc.	4727	L'Annonciation	—
2016-10-27	217-616	0XXX1XXX2XXX3XXX4XXX6XXX9XXX · 5 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	AUBURN	IL
2016-10-27	217-780	0XXX1XXX7XXX9XXX · 4 holders which blocks →	FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL	1000	CASEY	IL
2016-10-27	520-354	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ	6572	TUCSON	AZ
2016-10-27	571-767	0–9 XXXwhole prefix which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	ENGLESIDE	VA
2016-10-27	581-501	not yet reported which blocks →	Iristel Inc.	154E	Levis	—
2016-10-27	619-695	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - CA	649C	SNDG SNDG	CA
2016-10-27	639-227	not yet reported which blocks →	Bell Mobility	6574	Birch Hills	—
2016-10-27	639-228	not yet reported which blocks →	Bell Mobility	6574	Kinistino	—
2016-10-27	639-229	not yet reported which blocks →	Bell Mobility	6574	Naicam	—
2016-10-27	639-230	not yet reported which blocks →	Bell Mobility	6574	Canwood	—
2016-10-27	639-231	not yet reported which blocks →	Bell Mobility	6574	Porcupine Plain	—
2016-10-27	639-232	not yet reported which blocks →	Bell Mobility	6574	Leask	—
2016-10-27	639-233	not yet reported which blocks →	Bell Mobility	6574	Smeaton	—
2016-10-27	639-234	not yet reported which blocks →	Bell Mobility	6574	Goodsoil	—
2016-10-27	639-235	not yet reported which blocks →	Bell Mobility	6574	Kyle	—
2016-10-27	639-251	not yet reported which blocks →	Bell Mobility	6574	Elrose	—
2016-10-27	737-248	0–9 XXXall 10 · 7 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX	7249	KYLE	TX
2016-10-27	737-931	0–9 XXXall 10 · 4 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	AUSTIN	TX
2016-10-27	779-931	0XXX1XXX2XXX8XXX9XXX · 5 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	SANDWICH	IL
2016-10-27	909-774	0–9 XXXall 10 · 3 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	UPLAND	CA
2016-10-26	561-774	0–9 XXXall 10 · 3 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	DELRAY BCH	FL
2016-10-26	561-931	0–9 XXXall 10 · 7 holders which blocks →	COMCAST IP PHONE, LLC	318J	BOCA RATON	FL
2016-10-26	639-252	not yet reported which blocks →	Bell Mobility	6574	Luseland	—
2016-10-26	639-253	not yet reported which blocks →	Bell Mobility	6574	Neilburg	—
2016-10-26	639-254	not yet reported which blocks →	Bell Mobility	6574	Pierceland	—
2016-10-26	639-255	not yet reported which blocks →	Bell Mobility	6574	St. Walburg	—
2016-10-26	639-256	not yet reported which blocks →	Bell Mobility	6574	Watson	—
2016-10-26	639-257	not yet reported which blocks →	Bell Mobility	6574	Yellow Creek	—
2016-10-26	639-258	not yet reported which blocks →	Bell Mobility	6574	Beauval	—
2016-10-26	639-259	not yet reported which blocks →	Bell Mobility	6574	Ile-A-La-Crosse	—

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/28/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.