NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 508-443

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The ten 1,000-number thousand-blocks inside prefix 508-443 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 508 blocks

Most active assignees, all time — NPA 508
NEW CINGULAR WIRELESS PCS, LLC - DC 3
BANDWIDTH.COM CLEC, LLC - MA 3
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 1
TERRA NOVA TELECOM INC. 1
LEVEL 3 COMMUNICATIONS, LLC - MA 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
— 508-443-0XXX 0000–0999Reserved LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BRIDGEWTR MA
2008-11-10 508-443-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E BRIDGEWTR MA
2017-09-20 508-443-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J BRIDGEWTR MA
2021-06-15 508-443-3XXX 3000–3999Assigned TERRA NOVA TELECOM INC. 145J BRIDGEWTR MA
2010-01-25 508-443-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E BRIDGEWTR MA
2006-12-06 508-443-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J BRIDGEWTR MA
2013-06-19 508-443-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E BRIDGEWTR MA
2021-11-18 508-443-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BRIDGEWTR MA
2021-11-18 508-443-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BRIDGEWTR MA
2022-01-14 508-443-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BRIDGEWTR MA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.