NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 308-353

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 308-353 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 308 blocks

Most active assignees, all time — NPA 308
N.E. COLORADO CELLULAR, INC. 7
UNITED STATES CELLULAR - NE 2
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 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
— 308-353-0XXX 0000–0999Reserved N.E. COLORADO CELLULAR, INC. 6874 GRANT NE
— 308-353-1XXX 1000–1999Reserved N.E. COLORADO CELLULAR, INC. 6874 GRANT NE
— 308-353-2XXX 2000–2999Reserved N.E. COLORADO CELLULAR, INC. 6874 GRANT NE
2009-06-25 308-353-3XXX 3000–3999Assigned UNITED STATES CELLULAR - NE 6263 GRANT NE
— 308-353-4XXX 4000–4999Reserved N.E. COLORADO CELLULAR, INC. 6874 GRANT NE
2018-04-30 308-353-5XXX 5000–5999Assigned UNITED STATES CELLULAR - NE 6263 GRANT NE
— 308-353-6XXX 6000–6999Reserved N.E. COLORADO CELLULAR, INC. 6874 GRANT NE
2020-03-17 308-353-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 5807 GRANT NE
— 308-353-8XXX 8000–8999Reserved N.E. COLORADO CELLULAR, INC. 6874 GRANT NE
— 308-353-9XXX 9000–9999Reserved N.E. COLORADO CELLULAR, INC. 6874 GRANT NE

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.