NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 610-400

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 610-400 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 610 blocks

Most active assignees, all time — NPA 610
OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 5
LEVEL 3 COMMUNICATIONS, LLC - PA 3
CTSI, INC. - PA 1
CORE COMMUNICATIONS, INC. - 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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
— 610-400-0XXX 0000–0999Reserved CORE COMMUNICATIONS, INC. - PA 3806 COATESVL PA
2005-01-26 610-400-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - PA 4007 COATESVL PA
2025-02-12 610-400-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 6626 COATESVL PA
2007-10-24 610-400-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - PA 4007 COATESVL PA
2008-06-16 610-400-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 6626 COATESVL PA
2007-02-12 610-400-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 6626 COATESVL PA
2006-11-09 610-400-6XXX 6000–6999Assigned CTSI, INC. - PA 7513 COATESVL PA
2006-09-29 610-400-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 6626 COATESVL PA
2006-04-14 610-400-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - PA 4007 COATESVL PA
2007-05-08 610-400-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 6626 COATESVL 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.