NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 559-671

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026

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

The ten 1,000-number thousand-blocks inside prefix 559-671 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 559 blocks

Most active assignees, all time — NPA 559
HD CARRIER LLC 6
TELEPORT COMMUNICATIONS AMERICA, LLC - CA 1
PEERLESS NETWORK OF CALIFORNIA, LLC - CA 1
NEW CINGULAR WIRELESS PCS, LLC 1
LEVEL 3 COMMUNICATIONS, LLC - CA 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
2013-11-26 559-671-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F EXETER CA
2016-05-13 559-671-1XXX 1000–1999Assigned HD CARRIER LLC 321J EXETER CA
2016-05-13 559-671-2XXX 2000–2999Assigned HD CARRIER LLC 321J EXETER CA
2016-05-13 559-671-3XXX 3000–3999Assigned HD CARRIER LLC 321J EXETER CA
— 559-671-4XXX 4000–4999Reserved LEVEL 3 COMMUNICATIONS, LLC - CA 8826 EXETER CA
2016-05-13 559-671-5XXX 5000–5999Assigned HD CARRIER LLC 321J EXETER CA
2012-06-04 559-671-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 EXETER CA
2024-11-12 559-671-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 EXETER CA
2016-08-02 559-671-8XXX 8000–8999Assigned HD CARRIER LLC 321J EXETER CA
2016-08-02 559-671-9XXX 9000–9999Assigned HD CARRIER LLC 321J EXETER CA

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.