Recent prefix assignments

1 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 774

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
2017-09-12	774-366	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - MA	892D	WORCESTER	MA
2017-09-07	774-350	0–9 XXXwhole prefix which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	HOPKINTON	MA
2017-08-07	774-349	0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	FALMOUTH	MA
2017-07-21	774-346	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	FRAMINGHAM	MA
2017-05-16	774-344	0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	OXFORD	MA
2017-05-10	774-341	0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - MA	990E	HOLLISTON	MA
2017-04-17	774-737	0–9 XXXall 10 · 7 holders which blocks →	TELNYX LLC	073H	MILFORD	MA
2017-03-08	774-946	0–9 XXXall 10 · 4 holders which blocks →	METROPCS, INC.	5562	WHITINSVL	MA
2017-01-24	774-498	0–9 XXXall 10 · 4 holders which blocks →	METROPCS, INC.	5562	FRAMINGHAM	MA
2017-01-23	774-764	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	HOLDEN	MA
2016-12-29	774-394	0XXX1XXX2XXX3XXX6XXX8XXX9XXX · 6 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	E DOUGLAS	MA
2016-12-09	774-712	0–9 XXXall 10 · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	ROCHESTER	MA
2016-12-09	774-713	0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	WESTPORT	MA
2016-12-09	774-717	0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	CHILMARK	MA
2016-08-22	774-615	0–9 XXXall 10 · 2 holders which blocks →	METROPCS, INC.	5562	FRAMINGHAM	MA
2016-08-05	774-539	0–9 XXXall 10 · 7 holders which blocks →	PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA	268F	BROCKTON	MA
2016-08-05	774-559	0–9 XXXall 10 · 5 holders which blocks →	PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA	268F	BARNSTABLE	MA
2016-08-02	774-765	0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks →	METROPCS, INC.	5562	FOXBORO	MA
2016-07-27	774-762	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	NEWBEDFORD	MA
2016-07-22	774-770	0–9 XXXall 10 · 4 holders which blocks →	METROPCS, INC.	5562	NEWBEDFORD	MA
2016-06-29	774-772	0–9 XXXall 10 · 7 holders which blocks →	METROPCS, INC.	5562	AUBURN	MA
2016-06-17	774-608	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	PLYMOUTH	MA
2016-03-30	774-340	0–9 XXXall 10 · 8 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	ATTLEBORO	MA
2016-03-23	774-387	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	ONVOY, LLC - MA	892D	BLACKSTONE	MA
2016-03-23	774-497	0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks →	ONVOY, LLC - MA	892D	NO SWANSEA	MA
2016-03-14	774-600	0XXX1XXX6XXX8XXX9XXX · 4 holders which blocks →	ONVOY, LLC - MA	892D	OAKHAM	MA
2016-03-09	774-335	0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	ONVOY, LLC - MA	892D	MILLIS	MA
2016-03-09	774-347	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - MA	892D	NOBROOKFLD	MA
2016-03-09	774-484	0XXX1XXX2XXX5XXX7XXX8XXX9XXX · 4 holders which blocks →	ONVOY, LLC - MA	892D	BELLINGHAM	MA
2016-03-09	774-561	0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 5 holders which blocks →	ONVOY, LLC - MA	892D	ORLEANS	MA
2016-02-26	774-556	1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	MARLBORO	MA
2016-02-26	774-778	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	METROPCS, INC.	5562	WORCESTER	MA
2016-01-22	774-707	0–9 XXXall 10 · 3 holders which blocks →	METROPCS, INC.	5562	FRAMINGHAM	MA
2016-01-05	774-775	0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks →	ONVOY, LLC - MA	892D	WAREHAM	MA
2015-12-22	774-541	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	WALPOLE	MA
2015-10-08	774-601	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	SOUTHBDG	MA
2015-10-08	774-602	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	OSTERVILLE	MA
2015-09-29	774-534	0–9 XXXall 10 · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	BARNSTABLE	MA
2015-06-19	774-813	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - MA	990E	WHITINSVL	MA
2015-06-15	774-812	0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	SIASCONSET	MA
2015-06-04	774-510	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	NEWBEDFORD	MA
2015-05-04	774-480	0–9 XXXall 10 · 6 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BROCKTON	MA
2015-04-03	774-570	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	SHREWSBURY	MA
2015-01-22	774-540	0–9 XXXall 10 · 4 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	FRAMINGHAM	MA
2014-12-16	774-520	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - MA	892D	FALL RIVER	MA
2014-11-19	774-517	0–9 XXXall 10 · 4 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BROCKTON	MA
2014-10-09	774-458	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	DOVER	MA
2014-07-31	774-515	0–9 XXXall 10 · 7 holders which blocks →	BANDWIDTH.COM CLEC, LLC - MA	990E	BOYLSTON	MA
2014-06-19	774-478	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	DOVER	MA
2014-06-09	774-434	0–9 XXXall 10 · 2 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BROCKTON	MA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.