NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 815-687

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 815-687 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 815 blocks

Most active assignees, all time — NPA 815
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 3
T-MOBILE USA, INC. 2
RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 1
PEERLESS NETWORK OF ILLINOIS, LLC - IL 1
IP HORIZON 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
2014-06-06 815-687-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E WOODSTOCK IL
2013-04-09 815-687-1XXX 1000–1999Assigned IP HORIZON LLC 515J WOODSTOCK IL
2014-08-14 815-687-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 WOODSTOCK IL
— 815-687-3XXX 3000–3999Reserved RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 WOODSTOCK IL
2014-08-14 815-687-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 WOODSTOCK IL
2016-11-11 815-687-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 WOODSTOCK IL
2008-09-15 815-687-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 WOODSTOCK IL
2014-01-30 815-687-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WOODSTOCK IL
2011-10-19 815-687-8XXX 8000–8999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E WOODSTOCK IL
2016-11-11 815-687-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 WOODSTOCK IL

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.