NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 410-629

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026

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

The ten 1,000-number thousand-blocks inside prefix 410-629 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 410 blocks

Most active assignees, all time — NPA 410
CORE COMMUNICATIONS, INC.- MD 4
VERIZON MARYLAND, INC. 3
YMAX COMMUNICATIONS CORP. - MD 2
NEW CINGULAR WIRELESS PCS, LLC - DC 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
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
— 410-629-0XXX 0000–0999Reserved VERIZON MARYLAND, INC. 9212 BERLIN MD
— 410-629-1XXX 1000–1999Reserved VERIZON MARYLAND, INC. 9212 BERLIN MD
2019-02-22 410-629-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BERLIN MD
2004-03-04 410-629-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BERLIN MD
2019-04-16 410-629-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BERLIN MD
2011-03-07 410-629-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BERLIN MD
2004-08-27 410-629-6XXX 6000–6999Assigned VERIZON MARYLAND, INC. 9212 BERLIN MD
2019-04-16 410-629-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BERLIN MD
2011-03-07 410-629-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BERLIN MD
2005-03-14 410-629-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BERLIN 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.