NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 928-788

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 928-788 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 928 blocks

Most active assignees, all time — NPA 928
CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 7
NEW CINGULAR WIRELESS PCS, LLC 2
LEVEL 3 COMMUNICATIONS, LLC - AZ 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
2005-06-29 928-788-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 MOHAVE VLY AZ
— 928-788-1XXX 1000–1999Reserved CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 2172 MOHAVE VLY AZ
— 928-788-2XXX 2000–2999Reserved CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 2172 MOHAVE VLY AZ
— 928-788-3XXX 3000–3999Reserved CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 2172 MOHAVE VLY AZ
— 928-788-4XXX 4000–4999Reserved CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 2172 MOHAVE VLY AZ
2016-05-26 928-788-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MOHAVE VLY AZ
— 928-788-6XXX 6000–6999Reserved CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 2172 MOHAVE VLY AZ
— 928-788-7XXX 7000–7999Reserved CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 2172 MOHAVE VLY AZ
2015-07-02 928-788-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MOHAVE VLY AZ
— 928-788-9XXX 9000–9999Reserved CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 2172 MOHAVE VLY AZ

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.