Recent prefix assignments

358 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
2005-02-01	916-949	0–9 XXXall 10 · 2 holders which blocks →	UTILITY TELECOM GROUP, LLC - CA	9262	SCRM MAIN	CA
2005-01-31	203-307	0–9 XXXall 10 · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT	7230	FAIRFIELD	CT
2005-01-31	203-540	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	BRIDGEPORT	CT
2005-01-31	203-898	0–9 XXXall 10 · 2 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT	7230	DARIEN	CT
2005-01-31	203-990	0–9 XXXall 10 · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT	7230	OLDGRNWICH	CT
2005-01-31	239-676	0–9 XXXall 10 · 5 holders which blocks →	COMCAST IP PHONE, LLC	318J	BONITA SPG	FL
2005-01-31	347-601	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	NWYRCYZN05	NY
2005-01-31	347-602	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	NWYRCYZN05	NY
2005-01-31	804-544	0–9 XXXall 10 · 5 holders which blocks →	CORETEL VIRGINIA, LLC - VA	5832	MONTPELIER	VA
2005-01-28	480-313	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ	6572	PHOENIX	AZ
2005-01-28	480-678	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	PHOENIX	AZ
2005-01-28	503-564	0XXX1XXX3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OR	3234	HOOD LAND	OR
2005-01-27	202-470	0–9 XXXall 10 · 3 holders which blocks →	VERIZON WASHINGTON DC, INC.	9211	WSHNGTNZN1	DC
2005-01-27	231-424	2XXX4XXX7XXX · 2 holders which blocks →	ACD TELECOM, INC. - MI	3535	CARR	MI
2005-01-27	256-693	0–9 XXXall 10 · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - GA	6214	HAZELGREEN	AL
2005-01-27	256-695	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - GA	6214	BRIDGEPORT	AL
2005-01-27	574-933	0–9 XXXall 10 · 3 holders which blocks →	COMMUNICATIONS VENTURE CORP DBA INDIGITAL TELECOM	4169	PLYMOUTH	IN
2005-01-27	920-350	0–9 XXXall 10 · 4 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	COLUMBUS	WI
2005-01-26	503-442	0–9 XXXwhole prefix which blocks →	T-MOBILE USA, INC.	6529	PORTLAND	OR
2005-01-26	810-344	0–9 XXXall 10 · 8 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI	7279	GRANDBLANC	MI
2005-01-26	843-503	0–9 XXXall 10 · 2 holders which blocks →	SUNCOM DBA T-MOBILE USA	8645	WMYRTLEBCH	SC
2005-01-26	843-505	2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SC	6398	BLUFFTON	SC
2005-01-26	864-615	5XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC - GA	6214	MT CARMEL	SC
2005-01-25	205-514	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - GA	6214	GARDENDALE	AL
2005-01-25	250-736	not yet reported which blocks →	TELUS	8086	Port Alberni	—
2005-01-25	250-737	not yet reported which blocks →	TELUS	8086	Duncan	—
2005-01-25	330-520	2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH	7836	MARSHALLVL	OH
2005-01-25	416-637	not yet reported which blocks →	Rogers Communications Canada Inc. (Cable)	8377	Toronto	—
2005-01-25	450-280	not yet reported which blocks →	Rogers Communications Canada Inc. (Wireless)	8821	Ste-Therese	—
2005-01-25	580-817	0XXX1XXX5XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK	5813	TEXHOMA	OK
2005-01-25	670-285	not yet reported which blocks →	PTI PACIFICA INC.	387C	SAIPAN	—
2005-01-24	205-449	0–9 XXXwhole prefix which blocks →	LEVEL 3 TELECOM OF ALABAMA, LLC - AL	7327	BIRMINGHAM	AL
2005-01-24	334-460	0–9 XXXwhole prefix which blocks →	LEVEL 3 TELECOM OF ALABAMA, LLC - AL	7327	MONTGOMERY	AL
2005-01-24	480-252	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	PHOENIX	AZ
2005-01-24	559-579	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	FRESNO	CA
2005-01-24	704-858	0–9 XXXwhole prefix which blocks →	SUNCOM DBA T-MOBILE USA	8645	CHARLOTTE	NC
2005-01-24	951-534	0–9 XXXall 10 · 3 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	RIVERSIDE	CA
2005-01-21	231-262	0–9 XXXall 10 · 5 holders which blocks →	ACD TELECOM, INC. - MI	3535	ELMIRA	MI
2005-01-21	270-580	1XXX6XXX which blocks →	BRANDENBURG TELECOM, LLC - KY	5672	HARDINSBG	KY
2005-01-21	418-306	not yet reported which blocks →	Videotron Ltd.	8306	La Baie (Chicoutimi Co.)	—
2005-01-21	418-312	not yet reported which blocks →	Videotron Ltd.	8306	St-Honore (Chicoutimi Co.)	—
2005-01-21	418-526	not yet reported which blocks →	Videotron Ltd.	8306	St-Ambroise-de-Chicoutimi	—
2005-01-21	450-717	not yet reported which blocks →	Videotron Ltd.	8306	Vercheres	—
2005-01-21	478-251	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA	6540	MILLEDGEVL	GA
2005-01-21	646-451	0–9 XXXwhole prefix which blocks →	PAETEC ITEL, LLC	829J	NWYRCYZN01	NY
2005-01-21	660-373	3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO	5814	BETHANY	MO
2005-01-21	773-597	0–9 XXXall 10 · 7 holders which blocks →	FIRST COMMUNICATIONS, LLC	460K	CHICGOZN07	IL
2005-01-21	919-701	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - NC	3235	BENSON	NC
2005-01-20	352-608	0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	TRILACOCHE	FL
2005-01-20	418-213	not yet reported which blocks →	Videotron Ltd.	8306	Jonquiere	—

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.