NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 301-508

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 301-508 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 301 blocks

Most active assignees, all time — NPA 301
NEW CINGULAR WIRELESS PCS, LLC - DC 5
COMCAST IP PHONE, LLC 2
CORE COMMUNICATIONS, INC.- MD 1
CENTURYLINK COMMUNICATIONS, LLC 1
BANDWIDTH.COM CLEC, LLC - MD 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
— 301-508-0XXX 0000–0999Reserved NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MYERSVILLE MD
2017-08-04 301-508-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MYERSVILLE MD
2017-08-04 301-508-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MYERSVILLE MD
2017-08-04 301-508-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MYERSVILLE MD
2017-12-07 301-508-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MYERSVILLE MD
2019-04-16 301-508-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MYERSVILLE MD
2016-09-22 301-508-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MYERSVILLE MD
2007-02-26 301-508-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J MYERSVILLE MD
2019-04-10 301-508-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J MYERSVILLE MD
2007-05-22 301-508-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F MYERSVILLE MD

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.