Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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

IP HORIZON LLC 69

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
2021-07-22	443-200-8XXX	8000–8999	Assigned	IP HORIZON LLC	515J	WOODLAWN	MD
2021-07-22	443-702-9XXX	9000–9999	Assigned	IP HORIZON LLC	515J	ARGRGBSNIS	MD
2019-03-27	443-592-8XXX	8000–8999	Assigned	IP HORIZON LLC	515J	ELKRIDGE	MD
2017-06-13	443-396-6XXX	6000–6999	Assigned	IP HORIZON LLC	515J	ODENTON	MD
2017-06-13	443-661-2XXX	2000–2999	Assigned	IP HORIZON LLC	515J	WATERLO238	MD
2016-09-15	443-430-1XXX	1000–1999	Assigned	IP HORIZON LLC	515J	COLUMBIA	MD
2016-09-15	443-456-5XXX	5000–5999	Assigned	IP HORIZON LLC	515J	EDGEWOOD	MD
2016-09-15	443-461-7XXX	7000–7999	Assigned	IP HORIZON LLC	515J	PARKVILLE	MD
2016-09-15	443-530-2XXX	2000–2999	Assigned	IP HORIZON LLC	515J	DUNDALK	MD
2016-09-15	443-541-6XXX	6000–6999	Assigned	IP HORIZON LLC	515J	COCKEYSVL	MD
2016-09-15	443-584-8XXX	8000–8999	Assigned	IP HORIZON LLC	515J	CROFTON	MD
2016-09-15	443-594-9XXX	9000–9999	Assigned	IP HORIZON LLC	515J	SPARROWSPT	MD
2016-09-15	443-650-2XXX	2000–2999	Assigned	IP HORIZON LLC	515J	REISTERSTN	MD
2016-09-15	443-652-9XXX	9000–9999	Assigned	IP HORIZON LLC	515J	TOWSON	MD
2016-09-15	443-657-1XXX	1000–1999	Assigned	IP HORIZON LLC	515J	RANDALLSTN	MD
2016-09-15	443-685-7XXX	7000–7999	Assigned	IP HORIZON LLC	515J	SEVERN	MD
2016-05-03	443-228-7XXX	7000–7999	Assigned	IP HORIZON LLC	515J	CHASE	MD
2016-05-03	443-231-9XXX	9000–9999	Assigned	IP HORIZON LLC	515J	ESSEX	MD
2016-05-03	443-265-8XXX	8000–8999	Assigned	IP HORIZON LLC	515J	FORK	MD
2016-05-03	443-328-8XXX	8000–8999	Assigned	IP HORIZON LLC	515J	SYKESVILLE	MD
2016-05-03	443-338-5XXX	5000–5999	Assigned	IP HORIZON LLC	515J	SPARKSGLNC	MD
2016-05-03	443-441-8XXX	8000–8999	Assigned	IP HORIZON LLC	515J	GLENWOOD	MD
2016-05-03	443-663-9XXX	9000–9999	Assigned	IP HORIZON LLC	515J	WOODLAWN	MD
2016-05-03	443-733-8XXX	8000–8999	Assigned	IP HORIZON LLC	515J	WATERLO238	MD
2016-05-03	443-753-8XXX	8000–8999	Assigned	IP HORIZON LLC	515J	WATERLO236	MD
2016-05-03	443-775-8XXX	8000–8999	Assigned	IP HORIZON LLC	515J	ANNAPOLIS	MD
2016-05-03	443-906-8XXX	8000–8999	Assigned	IP HORIZON LLC	515J	SEVERNA PK	MD
2015-12-07	443-230-8XXX	8000–8999	Assigned	IP HORIZON LLC	515J	ODENTON	MD
2015-12-07	443-273-8XXX	8000–8999	Assigned	IP HORIZON LLC	515J	REISTERSTN	MD
2015-12-07	443-353-8XXX	8000–8999	Assigned	IP HORIZON LLC	515J	COCKEYSVL	MD
2015-12-07	443-532-9XXX	9000–9999	Assigned	IP HORIZON LLC	515J	PRINCEFRCK	MD
2015-12-07	443-576-8XXX	8000–8999	Assigned	IP HORIZON LLC	515J	RANDALLSTN	MD
2015-12-07	443-593-0XXX	0000–0999	Assigned	IP HORIZON LLC	515J	ELKTON	MD
2015-12-07	443-607-9XXX	9000–9999	Assigned	IP HORIZON LLC	515J	WEST RIVER	MD
2015-12-07	443-649-8XXX	8000–8999	Assigned	IP HORIZON LLC	515J	SPARROWSPT	MD
2015-12-07	443-792-6XXX	6000–6999	Assigned	IP HORIZON LLC	515J	BRYNPKLNCM	MD
2015-02-23	443-230-9XXX	9000–9999	Assigned	IP HORIZON LLC	515J	ODENTON	MD
2015-02-23	443-272-8XXX	8000–8999	Assigned	IP HORIZON LLC	515J	RANDALLSTN	MD
2015-02-23	443-294-9XXX	9000–9999	Assigned	IP HORIZON LLC	515J	WEST RIVER	MD
2015-02-23	443-432-6XXX	6000–6999	Assigned	IP HORIZON LLC	515J	PRINCEFRCK	MD
2015-02-23	443-578-9XXX	9000–9999	Assigned	IP HORIZON LLC	515J	COCKEYSVL	MD
2015-02-23	443-593-6XXX	6000–6999	Assigned	IP HORIZON LLC	515J	ELKTON	MD
2015-02-23	443-776-9XXX	9000–9999	Assigned	IP HORIZON LLC	515J	ELKRIDGE	MD
2015-02-23	443-792-1XXX	1000–1999	Assigned	IP HORIZON LLC	515J	BRYNPKLNCM	MD
2015-02-23	443-881-1XXX	1000–1999	Assigned	IP HORIZON LLC	515J	REISTERSTN	MD
2015-02-23	443-943-8XXX	8000–8999	Assigned	IP HORIZON LLC	515J	SPARROWSPT	MD
2015-02-19	443-328-9XXX	9000–9999	Assigned	IP HORIZON LLC	515J	SYKESVILLE	MD
2015-02-19	443-338-1XXX	1000–1999	Assigned	IP HORIZON LLC	515J	SPARKSGLNC	MD
2015-02-19	443-419-9XXX	9000–9999	Assigned	IP HORIZON LLC	515J	GLENWOOD	MD
2015-02-19	443-584-9XXX	9000–9999	Assigned	IP HORIZON LLC	515J	CROFTON	MD

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.