NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

2 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 410
ONVOY, LLC - MD 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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2019-04-12 410-995-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ELLICOTTCY MD
2019-04-05 410-315-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SEVERNA PK MD
2019-04-05 410-315-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SEVERNA PK MD
2019-04-05 410-421-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SEVERNA PK MD
2019-04-05 410-421-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SEVERNA PK MD
2019-04-05 410-421-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SEVERNA PK MD
2019-04-05 410-431-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SEVERNA PK MD
2019-03-27 410-291-9XXX 9000–9999Assigned IP HORIZON LLC 515J BALTIMORE MD
2019-03-27 410-315-2XXX 2000–2999Assigned IP HORIZON LLC 515J SEVERNA PK MD
2019-03-27 410-338-9XXX 9000–9999Assigned IP HORIZON LLC 515J BALTIMORE MD
2019-03-27 410-583-3XXX 3000–3999Assigned IP HORIZON LLC 515J TOWSON MD
2019-03-27 410-759-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2019-03-27 410-763-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 EASTON MD
2019-03-27 410-763-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 EASTON MD
2019-03-27 410-763-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 EASTON MD
2019-03-20 410-892-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GLENBURNIE MD
2019-03-15 410-248-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 PARKVILLE MD
2019-03-15 410-645-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WOODLAWN MD
2019-03-13 410-352-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BISHOPVL MD
2019-03-13 410-536-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ARBUTUS MD
2019-02-27 410-673-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 PRESTON MD
2019-02-27 410-762-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GLENBURNIE MD
2019-02-26 410-847-7XXX 7000–7999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G TOWSON MD
2019-02-22 410-629-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BERLIN MD
2019-02-11 410-329-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COCKEYSVL MD
2019-02-11 410-425-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D SMITH IS MD
2019-02-11 410-425-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D SMITH IS MD
2019-02-11 410-568-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COCKEYSVL MD
2019-02-11 410-835-0XXX 0000–0999Assigned ONVOY, LLC - MD 876D WILLARDS MD
2019-02-11 410-835-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D WILLARDS MD
2019-02-11 410-883-0XXX 0000–0999Assigned ONVOY, LLC - MD 876D SHARPTOWN MD
2019-02-11 410-883-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D SHARPTOWN MD
2019-02-11 410-886-6XXX 6000–6999Assigned ONVOY, LLC - MD 876D TILGHMAN MD
2019-02-06 410-213-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D OCEAN CITY MD
2019-02-06 410-264-1XXX 1000–1999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G WATERLO236 MD
2019-02-06 410-352-0XXX 0000–0999Assigned ONVOY, LLC - MD 876D BISHOPVL MD
2019-02-06 410-352-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D BISHOPVL MD
2019-02-06 410-376-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D VIENNA MD
2019-02-06 410-376-6XXX 6000–6999Assigned ONVOY, LLC - MD 876D VIENNA MD
2019-02-06 410-390-0XXX 0000–0999Assigned ONVOY, LLC - MD 876D OCEAN CITY MD
2019-02-06 410-623-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D MARION MD
2019-02-06 410-770-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 EASTON MD
2019-02-06 410-873-1XXX 1000–1999Assigned ONVOY, LLC - MD 876D NANTICOKE MD
2019-02-06 410-873-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D NANTICOKE MD
2019-02-06 410-896-1XXX 1000–1999Assigned ONVOY, LLC - MD 876D DELMAR MD
2019-02-06 410-896-6XXX 6000–6999Assigned ONVOY, LLC - MD 876D DELMAR MD
2019-02-06 410-973-6XXX 6000–6999Assigned ONVOY, LLC - MD 876D BERLIN MD
2019-02-06 410-973-7XXX 7000–7999Assigned ONVOY, LLC - MD 876D BERLIN MD
2019-01-09 410-319-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2018-12-11 410-339-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON 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.