NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 484-237

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 484-237 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 484 blocks

Most active assignees, all time — NPA 484
LEVEL 3 COMMUNICATIONS, LLC - PA 3
CORE COMMUNICATIONS, INC. - PA 2
TON80 COMMUNICATIONS, LLC 1
PEERLESS NETWORK OF PENNSYLVANIA, LLC - PA 1
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - PA 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
2004-03-23 484-237-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC. - PA 3806 DOWNINGTN PA
2007-10-26 484-237-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - PA 002F DOWNINGTN PA
2003-04-15 484-237-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - PA 7434 DOWNINGTN PA
2008-11-04 484-237-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - PA 4007 DOWNINGTN PA
2022-02-24 484-237-4XXX 4000–4999Assigned TON80 COMMUNICATIONS, LLC 516J DOWNINGTN PA
— 484-237-5XXX 5000–5999Reserved LEVEL 3 COMMUNICATIONS, LLC - PA 4007 DOWNINGTN PA
— 484-237-6XXX 6000–6999Reserved LEVEL 3 COMMUNICATIONS, LLC - PA 4007 DOWNINGTN PA
2019-03-07 484-237-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 DOWNINGTN PA
2002-07-17 484-237-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J DOWNINGTN PA
2012-04-16 484-237-9XXX 9000–9999Assigned PEERLESS NETWORK OF PENNSYLVANIA, LLC - PA 967E DOWNINGTN PA

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.