NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 410-510

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 410-510 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
ONVOY SPECTRUM, LLC 3
TELEPORT COMMUNICATIONS AMERICA, LLC - MD 2
ONVOY, LLC - MD 2
VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 1
CORE COMMUNICATIONS, INC.- 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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
— 410-510-0XXX 0000–0999Reserved TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 FORK MD
— 410-510-1XXX 1000–1999Reserved TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 FORK MD
2020-06-26 410-510-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H FORK MD
2004-01-21 410-510-3XXX 3000–3999Assigned VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 4492 FORK MD
2020-06-26 410-510-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H FORK MD
2004-03-01 410-510-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FORK MD
2020-06-26 410-510-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H FORK MD
2005-02-11 410-510-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J FORK MD
2022-09-20 410-510-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D FORK MD
2026-07-30 410-510-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D FORK 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.