Recent thousands-block assignments

0 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, all time — NPA 443

VERIZON MARYLAND, INC. 115

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
2011-11-14	443-634-0XXX	0000–0999	Assigned	VERIZON MARYLAND, INC.	9212	WATERLO236	MD
2011-11-14	443-634-1XXX	1000–1999	Assigned	VERIZON MARYLAND, INC.	9212	WATERLO236	MD
2011-11-14	443-634-2XXX	2000–2999	Assigned	VERIZON MARYLAND, INC.	9212	WATERLO236	MD
2011-11-14	443-634-3XXX	3000–3999	Assigned	VERIZON MARYLAND, INC.	9212	WATERLO236	MD
2011-11-14	443-634-4XXX	4000–4999	Assigned	VERIZON MARYLAND, INC.	9212	WATERLO236	MD
2011-11-14	443-634-5XXX	5000–5999	Assigned	VERIZON MARYLAND, INC.	9212	WATERLO236	MD
2011-11-14	443-634-6XXX	6000–6999	Assigned	VERIZON MARYLAND, INC.	9212	WATERLO236	MD
2011-11-14	443-634-7XXX	7000–7999	Assigned	VERIZON MARYLAND, INC.	9212	WATERLO236	MD
2011-11-14	443-634-8XXX	8000–8999	Assigned	VERIZON MARYLAND, INC.	9212	WATERLO236	MD
2011-11-14	443-634-9XXX	9000–9999	Assigned	VERIZON MARYLAND, INC.	9212	WATERLO236	MD
2011-03-16	443-380-5XXX	5000–5999	Assigned	VERIZON MARYLAND, INC.	9212	WOODLAWN	MD
2011-03-16	443-380-6XXX	6000–6999	Assigned	VERIZON MARYLAND, INC.	9212	WOODLAWN	MD
2011-03-16	443-380-7XXX	7000–7999	Assigned	VERIZON MARYLAND, INC.	9212	WOODLAWN	MD
2011-03-16	443-380-8XXX	8000–8999	Assigned	VERIZON MARYLAND, INC.	9212	WOODLAWN	MD
2010-04-12	443-558-5XXX	5000–5999	Assigned	VERIZON MARYLAND, INC.	9212	ABERDEEN	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
2009-03-16	443-462-3XXX	3000–3999	Assigned	VERIZON MARYLAND, INC.	9212	BALTIMORE	MD
2009-03-16	443-462-4XXX	4000–4999	Assigned	VERIZON MARYLAND, INC.	9212	BALTIMORE	MD
2009-03-16	443-462-5XXX	5000–5999	Assigned	VERIZON MARYLAND, INC.	9212	BALTIMORE	MD
2008-12-18	443-518-1XXX	1000–1999	Assigned	VERIZON MARYLAND, INC.	9212	COLUMBIA	MD
2008-12-18	443-518-2XXX	2000–2999	Assigned	VERIZON MARYLAND, INC.	9212	COLUMBIA	MD
2008-12-18	443-518-3XXX	3000–3999	Assigned	VERIZON MARYLAND, INC.	9212	COLUMBIA	MD
2008-12-18	443-518-4XXX	4000–4999	Assigned	VERIZON MARYLAND, INC.	9212	COLUMBIA	MD
2008-12-18	443-518-5XXX	5000–5999	Assigned	VERIZON MARYLAND, INC.	9212	COLUMBIA	MD
2008-08-29	443-654-0XXX	0000–0999	Assigned	VERIZON MARYLAND, INC.	9212	WATERLO236	MD
2008-08-29	443-654-1XXX	1000–1999	Assigned	VERIZON MARYLAND, INC.	9212	WATERLO236	MD
2008-08-29	443-654-2XXX	2000–2999	Assigned	VERIZON MARYLAND, INC.	9212	WATERLO236	MD
2008-08-29	443-654-3XXX	3000–3999	Assigned	VERIZON MARYLAND, INC.	9212	WATERLO236	MD
2008-08-29	443-654-4XXX	4000–4999	Assigned	VERIZON MARYLAND, INC.	9212	WATERLO236	MD
2008-08-29	443-654-5XXX	5000–5999	Assigned	VERIZON MARYLAND, INC.	9212	WATERLO236	MD
2008-08-29	443-654-6XXX	6000–6999	Assigned	VERIZON MARYLAND, INC.	9212	WATERLO236	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.