Recent thousands-block assignments

17 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.

Most active assignees, last 30 days — NPA 443

ONVOY, LLC - MD 8

NEW CINGULAR WIRELESS PCS, LLC - DC 4

VERSATEL LLC 1

OPENTACT INC. 1

LEVEL 3 COMMUNICATIONS, LLC - MD 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 thousands-block assignments
Assigned	Thousands-block	Last 4 digits	Status	Assignee	OCN	Rate center	State
2014-06-26	443-584-4XXX	4000–4999	Assigned	COMCAST IP PHONE, LLC	318J	CROFTON	MD
2014-06-24	443-442-6XXX	6000–6999	Assigned	COMCAST IP PHONE, LLC	318J	PARKVILLE	MD
2014-06-17	443-833-2XXX	2000–2999	Assigned	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	ARBUTUS	MD
2014-06-17	443-903-1XXX	1000–1999	Assigned	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	BEL AIR	MD
2014-06-16	443-809-0XXX	0000–0999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - MD	6119	TOWSON	MD
2014-06-16	443-809-1XXX	1000–1999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - MD	6119	TOWSON	MD
2014-06-16	443-809-2XXX	2000–2999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - MD	6119	TOWSON	MD
2014-06-16	443-809-3XXX	3000–3999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - MD	6119	TOWSON	MD
2014-06-16	443-809-4XXX	4000–4999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - MD	6119	TOWSON	MD
2014-06-16	443-809-5XXX	5000–5999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - MD	6119	TOWSON	MD
2014-06-16	443-809-6XXX	6000–6999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - MD	6119	TOWSON	MD
2014-06-16	443-809-7XXX	7000–7999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - MD	6119	TOWSON	MD
2014-06-16	443-809-8XXX	8000–8999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - MD	6119	TOWSON	MD
2014-06-16	443-809-9XXX	9000–9999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - MD	6119	TOWSON	MD
2014-06-13	443-213-5XXX	5000–5999	Assigned	COMCAST IP PHONE, LLC	318J	PIKESVILLE	MD
2014-06-13	443-707-1XXX	1000–1999	Assigned	IP HORIZON LLC	515J	ABERDEEN	MD
2014-06-11	443-914-2XXX	2000–2999	Assigned	BANDWIDTH.COM CLEC, LLC - MD	071F	WORTHINGTN	MD
2014-06-10	443-230-3XXX	3000–3999	Assigned	COMCAST IP PHONE, LLC	318J	ODENTON	MD
2014-06-10	443-943-4XXX	4000–4999	Assigned	METROPCS, INC.	5562	SPARROWSPT	MD
2014-06-02	443-753-2XXX	2000–2999	Assigned	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	WATERLO236	MD
2014-06-02	443-818-1XXX	1000–1999	Assigned	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	ARGRGBSNIS	MD
2014-06-02	443-818-2XXX	2000–2999	Assigned	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	ARGRGBSNIS	MD
2014-05-27	443-230-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	ODENTON	MD
2014-05-27	443-256-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	NORTH EAST	MD
2014-05-27	443-273-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	REISTERSTN	MD
2014-05-27	443-297-6XXX	6000–6999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	ARBUTUS	MD
2014-05-27	443-328-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	SYKESVILLE	MD
2014-05-27	443-331-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	TANEYTOWN	MD
2014-05-27	443-338-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	SPARKSGLNC	MD
2014-05-27	443-342-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	SOLOMONS	MD
2014-05-27	443-408-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	SPARROWSPT	MD
2014-05-27	443-489-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	CHASE	MD
2014-05-27	443-502-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	HAVREGRACE	MD
2014-05-27	443-565-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	RANDALLSTN	MD
2014-05-27	443-578-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	COCKEYSVL	MD
2014-05-27	443-584-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	CROFTON	MD
2014-05-27	443-599-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	SEVERN	MD
2014-05-27	443-648-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	ESSEX	MD
2014-05-27	443-770-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	ARGRGBSNIS	MD
2014-05-27	443-776-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	ELKRIDGE	MD
2014-05-27	443-828-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	ELLICOTTCY	MD
2014-05-27	443-906-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	SEVERNA PK	MD
2014-05-23	443-247-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	UNION BDG	MD
2014-05-23	443-663-7XXX	7000–7999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	WOODLAWN	MD
2014-05-23	443-914-6XXX	6000–6999	Assigned	CENTURYLINK COMMUNICATIONS, LLC	508J	WORTHINGTN	MD
2014-05-22	443-442-4XXX	4000–4999	Assigned	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	PARKVILLE	MD
2014-05-22	443-496-5XXX	5000–5999	Assigned	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	EASTON	MD
2014-05-22	443-754-7XXX	7000–7999	Assigned	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	SALISBURY	MD
2014-05-19	443-563-2XXX	2000–2999	Assigned	COMCAST IP PHONE, LLC	318J	BALTIMORE	MD
2014-05-16	443-256-3XXX	3000–3999	Assigned	BANDWIDTH.COM CLEC, LLC - MD	071F	NORTH EAST	MD

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.