Recent thousands-block assignments

17 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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
2009-09-30	443-455-1XXX	1000–1999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - MD	6119	BALTIMORE	MD
2009-09-30	443-537-0XXX	0000–0999	Assigned	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	COLUMBIA	MD
2009-09-25	443-537-1XXX	1000–1999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - MD	6119	COLUMBIA	MD
2009-09-24	443-924-2XXX	2000–2999	Assigned	PAETEC ITEL, LLC	829J	ANNAPOLIS	MD
2009-09-15	443-229-6XXX	6000–6999	Assigned	YMAX COMMUNICATIONS CORP. - MD	281E	SEVERNA PK	MD
2009-09-15	443-229-7XXX	7000–7999	Assigned	YMAX COMMUNICATIONS CORP. - MD	281E	SEVERNA PK	MD
2009-09-15	443-288-3XXX	3000–3999	Assigned	YMAX COMMUNICATIONS CORP. - MD	281E	ELLICOTTCY	MD
2009-09-14	443-252-0XXX	0000–0999	Assigned	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	PERRYVILLE	MD
2009-09-14	443-438-8XXX	8000–8999	Assigned	YMAX COMMUNICATIONS CORP. - MD	281E	BALTIMORE	MD
2009-09-14	443-478-7XXX	7000–7999	Assigned	YMAX COMMUNICATIONS CORP. - MD	281E	BALTIMORE	MD
2009-09-14	443-478-8XXX	8000–8999	Assigned	YMAX COMMUNICATIONS CORP. - MD	281E	BALTIMORE	MD
2009-09-14	443-478-9XXX	9000–9999	Assigned	YMAX COMMUNICATIONS CORP. - MD	281E	BALTIMORE	MD
2009-09-14	443-687-0XXX	0000–0999	Assigned	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	BALTIMORE	MD
2009-09-04	443-438-2XXX	2000–2999	Assigned	PAETEC ITEL, LLC	829J	BALTIMORE	MD
2009-09-03	443-397-3XXX	3000–3999	Assigned	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	SALISBURY	MD
2009-09-03	443-462-8XXX	8000–8999	Assigned	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	BALTIMORE	MD
2009-09-03	443-462-9XXX	9000–9999	Assigned	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	BALTIMORE	MD
2009-09-03	443-547-2XXX	2000–2999	Assigned	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	WESTMINSTR	MD
2009-08-28	443-547-1XXX	1000–1999	Assigned	METROPCS, INC.	5562	WESTMINSTR	MD
2009-08-14	443-395-0XXX	0000–0999	Assigned	VERIZON MARYLAND, INC.	9212	ABERDEEN	MD
2009-08-14	443-395-1XXX	1000–1999	Assigned	VERIZON MARYLAND, INC.	9212	ABERDEEN	MD
2009-08-14	443-395-2XXX	2000–2999	Assigned	VERIZON MARYLAND, INC.	9212	ABERDEEN	MD
2009-08-14	443-395-3XXX	3000–3999	Assigned	VERIZON MARYLAND, INC.	9212	ABERDEEN	MD
2009-08-14	443-395-4XXX	4000–4999	Assigned	VERIZON MARYLAND, INC.	9212	ABERDEEN	MD
2009-08-14	443-395-5XXX	5000–5999	Assigned	VERIZON MARYLAND, INC.	9212	ABERDEEN	MD
2009-08-14	443-395-6XXX	6000–6999	Assigned	VERIZON MARYLAND, INC.	9212	ABERDEEN	MD
2009-08-14	443-395-7XXX	7000–7999	Assigned	VERIZON MARYLAND, INC.	9212	ABERDEEN	MD
2009-08-14	443-395-8XXX	8000–8999	Assigned	VERIZON MARYLAND, INC.	9212	ABERDEEN	MD
2009-08-14	443-395-9XXX	9000–9999	Assigned	VERIZON MARYLAND, INC.	9212	ABERDEEN	MD
2009-08-14	443-861-0XXX	0000–0999	Assigned	VERIZON MARYLAND, INC.	9212	ABERDEEN	MD
2009-08-14	443-861-1XXX	1000–1999	Assigned	VERIZON MARYLAND, INC.	9212	ABERDEEN	MD
2009-08-14	443-861-2XXX	2000–2999	Assigned	VERIZON MARYLAND, INC.	9212	ABERDEEN	MD
2009-08-14	443-861-3XXX	3000–3999	Assigned	VERIZON MARYLAND, INC.	9212	ABERDEEN	MD
2009-08-14	443-861-4XXX	4000–4999	Assigned	VERIZON MARYLAND, INC.	9212	ABERDEEN	MD
2009-08-14	443-861-5XXX	5000–5999	Assigned	VERIZON MARYLAND, INC.	9212	ABERDEEN	MD
2009-08-14	443-861-6XXX	6000–6999	Assigned	VERIZON MARYLAND, INC.	9212	ABERDEEN	MD
2009-08-14	443-861-7XXX	7000–7999	Assigned	VERIZON MARYLAND, INC.	9212	ABERDEEN	MD
2009-08-14	443-861-8XXX	8000–8999	Assigned	VERIZON MARYLAND, INC.	9212	ABERDEEN	MD
2009-08-14	443-861-9XXX	9000–9999	Assigned	VERIZON MARYLAND, INC.	9212	ABERDEEN	MD
2009-08-11	443-835-1XXX	1000–1999	Assigned	COMCAST IP PHONE, LLC	318J	BALTIMORE	MD
2009-08-11	443-835-2XXX	2000–2999	Assigned	COMCAST IP PHONE, LLC	318J	BALTIMORE	MD
2009-08-11	443-835-3XXX	3000–3999	Assigned	COMCAST IP PHONE, LLC	318J	BALTIMORE	MD
2009-08-11	443-835-4XXX	4000–4999	Assigned	COMCAST IP PHONE, LLC	318J	BALTIMORE	MD
2009-08-11	443-869-6XXX	6000–6999	Assigned	COMCAST IP PHONE, LLC	318J	BALTIMORE	MD
2009-08-10	443-229-4XXX	4000–4999	Assigned	YMAX COMMUNICATIONS CORP. - MD	281E	SEVERNA PK	MD
2009-08-05	443-397-2XXX	2000–2999	Assigned	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	SALISBURY	MD
2009-08-05	443-591-1XXX	1000–1999	Assigned	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	GLENBURNIE	MD
2009-08-03	443-470-8XXX	8000–8999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - MD	6119	TOWSON	MD
2009-07-16	443-820-2XXX	2000–2999	Assigned	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD	7228	ELKRIDGE	MD
2009-07-07	443-721-0XXX	0000–0999	Assigned	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	BALTIMORE	MD

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.