NumberResearchThousands-blocks in 860-554
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
The ten 1,000-number thousand-blocks inside prefix 860-554 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 860 blocks
Most active assignees, all time — NPA 860
New assignments by month
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2006-10-23 | 860-554-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CT | 4800 | HADDAM | CT |
| 2011-03-14 | 860-554-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - CT | 199F | HADDAM | CT |
| 2005-02-10 | 860-554-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | HADDAM | CT |
| 2012-05-07 | 860-554-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | HADDAM | CT |
| 2018-08-10 | 860-554-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - CT | 199F | HADDAM | CT |
| 2004-11-22 | 860-554-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | HADDAM | CT |
| 2012-01-31 | 860-554-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CT | 4800 | HADDAM | CT |
| 2019-07-11 | 860-554-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CT | 639C | HADDAM | CT |
| 2013-04-05 | 860-554-8XXX | 8000–8999 | Assigned | PEERLESS NETWORK OF CONNECTICUT, LLC - CT | 539F | HADDAM | CT |
| — | 860-554-9XXX | 9000–9999 | Reserved | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HADDAM | CT |
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.