NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 304-398

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 304-398 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 304 blocks

Most active assignees, all time — NPA 304
PEERLESS NETWORK OF WEST VIRGINIA, LLC - WV 3
CSC VOICE, LLC 2
TELNYX LLC 1
NEW CINGULAR WIRELESS PCS, LLC - IL 1
MCIMETRO ACCESS TRANSMISSION SERVICES 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
2013-07-30 304-398-0XXX 0000–0999Assigned CORETEL WEST VIRGINIA, INC. - WV 5833 NEWMRTNSVL WV
2018-04-25 304-398-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - WV 080F NEWMRTNSVL WV
2014-01-23 304-398-2XXX 2000–2999Assigned CSC VOICE, LLC 612K NEWMRTNSVL WV
2011-11-21 304-398-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NEWMRTNSVL WV
2006-09-15 304-398-4XXX 4000–4999Assigned CSC VOICE, LLC 612K NEWMRTNSVL WV
2014-03-24 304-398-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NEWMRTNSVL WV
2018-02-07 304-398-6XXX 6000–6999Assigned PEERLESS NETWORK OF WEST VIRGINIA, LLC - WV 928H NEWMRTNSVL WV
2019-10-02 304-398-7XXX 7000–7999Assigned PEERLESS NETWORK OF WEST VIRGINIA, LLC - WV 928H NEWMRTNSVL WV
2018-10-01 304-398-8XXX 8000–8999Assigned TELNYX LLC 073H NEWMRTNSVL WV
2021-05-26 304-398-9XXX 9000–9999Assigned PEERLESS NETWORK OF WEST VIRGINIA, LLC - WV 928H NEWMRTNSVL WV

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.