NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 573-978

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 573-978 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 573 blocks

Most active assignees, last 30 days — NPA 573
INTRADO COMMUNICATIONS, 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
— 573-978-0XXX 0000–0999Available CENTERTOWN MO
— 573-978-1XXX 1000–1999Available CENTERTOWN MO
— 573-978-2XXX 2000–2999Available CENTERTOWN MO
— 573-978-3XXX 3000–3999Available CENTERTOWN MO
— 573-978-4XXX 4000–4999Available CENTERTOWN MO
2024-03-13 573-978-5XXX 5000–5999Assigned CSC VOICE, LLC 612K CENTERTOWN MO
— 573-978-6XXX 6000–6999Available CENTERTOWN MO
2026-09-16 573-978-7XXX 7000–7999Assigned INTRADO COMMUNICATIONS, LLC 824C CENTERTOWN MO
— 573-978-8XXX 8000–8999Available CENTERTOWN MO
2026-03-06 573-978-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CENTERTOWN MO

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.