NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 415-493

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 415-493 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 415 blocks

Most active assignees, all time — NPA 415
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 3
TWILIO INTERNATIONAL, INC. 1
ONVOY SPECTRUM, LLC 1
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 1
LEVEL 3 TELECOM OF CALIFORNIA, LP - 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
2007-03-14 415-493-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NOVATO CA
— 415-493-1XXX 1000–1999Reserved LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 NOVATO CA
2000-09-05 415-493-2XXX 2000–2999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J NOVATO CA
2000-09-05 415-493-3XXX 3000–3999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J NOVATO CA
2000-09-05 415-493-4XXX 4000–4999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J NOVATO CA
2000-08-03 415-493-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 NOVATO CA
2013-06-05 415-493-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L NOVATO CA
2024-05-28 415-493-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H NOVATO CA
2008-12-16 415-493-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E NOVATO CA
2006-08-28 415-493-9XXX 9000–9999Assigned TWILIO INTERNATIONAL, INC. 506J NOVATO CA

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.