NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 401-525

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 401-525 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 401 blocks

Most active assignees, all time — NPA 401
VERIZON NEW ENGLAND INC. 5
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - RI 5
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
2005-04-13 401-525-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - RI 6389 PROVIDENCE RI
2005-06-07 401-525-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - RI 6389 PROVIDENCE RI
— 401-525-2XXX 2000–2999Reserved VERIZON NEW ENGLAND INC. 9102 PROVIDENCE RI
— 401-525-3XXX 3000–3999Reserved VERIZON NEW ENGLAND INC. 9102 PROVIDENCE RI
2022-10-19 401-525-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - RI 6389 PROVIDENCE RI
— 401-525-5XXX 5000–5999Reserved VERIZON NEW ENGLAND INC. 9102 PROVIDENCE RI
2005-06-07 401-525-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - RI 6389 PROVIDENCE RI
— 401-525-7XXX 7000–7999Reserved VERIZON NEW ENGLAND INC. 9102 PROVIDENCE RI
2005-06-07 401-525-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - RI 6389 PROVIDENCE RI
— 401-525-9XXX 9000–9999Reserved VERIZON NEW ENGLAND INC. 9102 PROVIDENCE RI

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.