NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 301-820

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 301-820 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
TELEPORT COMMUNICATIONS AMERICA, LLC - DC 2
PAETEC ITEL, LLC 1
ONVOY, LLC - MD 1
ONVOY SPECTRUM, LLC 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
2012-01-24 301-820-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GAITHERSBG MD
2012-01-24 301-820-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GAITHERSBG MD
2010-09-01 301-820-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GAITHERSBG MD
2011-05-17 301-820-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J GAITHERSBG MD
— 301-820-4XXX 4000–4999Reserved TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 GAITHERSBG MD
2009-10-19 301-820-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GAITHERSBG MD
— 301-820-6XXX 6000–6999Reserved TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 GAITHERSBG MD
2011-06-07 301-820-7XXX 7000–7999Assigned ONVOY, LLC - MD 876D GAITHERSBG MD
2012-01-24 301-820-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GAITHERSBG MD
2021-12-08 301-820-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H GAITHERSBG 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.