Thousands-blocks in 858-207

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 858-207 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 858 blocks

Most active assignees, all time — NPA 858

TELEPORT COMMUNICATIONS AMERICA, LLC - CA 5

LEVEL 3 COMMUNICATIONS, LLC - CA 3

T-MOBILE USA, INC. 2

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

Recent thousands-block assignments
Assigned	Thousands-block	Last 4 digits	Status	Assignee	OCN	Rate center	State
—	858-207-0XXX	0000–0999	Reserved	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7147	RNCHOBRNDO	CA
—	858-207-1XXX	1000–1999	Reserved	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7147	RNCHOBRNDO	CA
—	858-207-2XXX	2000–2999	Reserved	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7147	RNCHOBRNDO	CA
2005-11-11	858-207-3XXX	3000–3999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	RNCHOBRNDO	CA
2005-11-11	858-207-4XXX	4000–4999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	RNCHOBRNDO	CA
—	858-207-5XXX	5000–5999	Reserved	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7147	RNCHOBRNDO	CA
2007-10-26	858-207-6XXX	6000–6999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	RNCHOBRNDO	CA
2005-11-21	858-207-7XXX	7000–7999	Assigned	T-MOBILE USA, INC.	6529	RNCHOBRNDO	CA
2006-09-13	858-207-8XXX	8000–8999	Assigned	T-MOBILE USA, INC.	6529	RNCHOBRNDO	CA
—	858-207-9XXX	9000–9999	Reserved	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7147	RNCHOBRNDO	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.