Recent prefix assignments

2 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 475

ONVOY, LLC - CT 2

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
2016-04-21	475-666	0–9 XXXall 10 · 7 holders which blocks →	PEERLESS NETWORK OF CONNECTICUT, LLC - CT	539F	WESTPORT	CT
2016-03-30	475-210	0–9 XXXall 10 · 6 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	BRIDGEPORT	CT
2016-03-21	475-230	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CT	7143	NEW HAVEN	CT
2016-02-22	475-275	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - CT	639C	BYRAM	CT
2016-02-18	475-207	0–9 XXXall 10 · 4 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	WOODBURY	CT
2016-02-11	475-470	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - CT	639C	NORWALK	CT
2016-02-08	475-245	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	NORWALK	CT
2016-02-05	475-775	0–9 XXXall 10 · 7 holders which blocks →	ONVOY, LLC - CT	639C	MERIDEN	CT
2016-01-28	475-228	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	ANSONIDRBY	CT
2016-01-28	475-331	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	NEW HAVEN	CT
2016-01-05	475-283	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	NORWALK	CT
2015-11-25	475-226	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	STAMFORD	CT
2015-11-17	475-224	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	NEW HAVEN	CT
2015-11-17	475-279	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	DANBURY	CT
2015-11-17	475-489	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	NORWALK	CT
2015-11-16	475-350	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	STAMFORD	CT
2015-10-08	475-292	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	STAMFORD	CT
2015-09-17	475-395	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	NORWALK	CT
2015-09-17	475-399	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	STAMFORD	CT
2015-09-17	475-414	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	NEW HAVEN	CT
2015-09-09	475-313	0–9 XXXall 10 · 6 holders which blocks →	OMNIPOINT COMMUNICATIONS, INC. - CT	6624	WATERBURY	CT
2015-09-04	475-559	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	WATERBURY	CT
2015-09-03	475-220	0–9 XXXwhole prefix which blocks →	PAETEC ITEL, LLC	829J	NEW HAVEN	CT
2015-08-11	475-218	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	DANBURY	CT
2015-08-11	475-225	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	BRIDGEPORT	CT
2015-08-10	475-731	0–9 XXXall 10 · 2 holders which blocks →	OMNIPOINT COMMUNICATIONS, INC. - CT	6624	ANSONIDRBY	CT
2015-08-05	475-439	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	ANSONIDRBY	CT
2015-07-29	475-323	0–9 XXXall 10 · 7 holders which blocks →	OMNIPOINT COMMUNICATIONS, INC. - CT	6624	NEWTOWN	CT
2015-07-01	475-419	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	STAMFORD	CT
2015-06-10	475-266	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	NORWALK	CT
2015-06-05	475-897	0–9 XXXall 10 · 8 holders which blocks →	CSC VOICE, LLC	612K	GREENWICH	CT
2015-06-04	475-747	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	NORWALK	CT
2015-06-01	475-330	0–9 XXXall 10 · 5 holders which blocks →	CSC VOICE, LLC	612K	FAIRFIELD	CT
2015-05-21	475-269	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - CT	639C	HUNTINGTON	CT
2015-05-12	475-213	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	STAMFORD	CT
2015-04-23	475-522	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	MADISON	CT
2015-04-23	475-549	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	MILFORD	CT
2015-04-23	475-558	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	NEW CANAAN	CT
2015-04-16	475-219	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	WOLCOTT	CT
2015-03-11	475-240	0–9 XXXwhole prefix which blocks →	TC SYSTEMS, INC. - NY	7140	GREENWICH	CT
2015-02-23	475-206	0–9 XXXall 10 · 6 holders which blocks →	OMNIPOINT COMMUNICATIONS, INC. - CT	6624	DANBURY	CT
2015-02-03	475-988	0–9 XXXall 10 · 6 holders which blocks →	OMNIPOINT COMMUNICATIONS, INC. - CT	6624	BRIDGEPORT	CT
2015-01-23	475-655	0–9 XXXall 10 · 7 holders which blocks →	OMNIPOINT COMMUNICATIONS, INC. - CT	6624	NEW HAVEN	CT
2015-01-20	475-299	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	STAMFORD	CT
2015-01-20	475-441	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	NEW HAVEN	CT
2014-12-24	475-343	0–9 XXXall 10 · 6 holders which blocks →	METROPCS, INC.	5562	MERIDEN	CT
2014-12-24	475-689	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT	6388	WATERBURY	CT
2014-12-23	475-619	0–9 XXXall 10 · 7 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CT	7143	STAMFORD	CT
2014-12-08	475-208	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CT	4800	NORWALK	CT
2014-12-01	475-325	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CT	199F	GEORGETOWN	CT

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.