NumberResearchThousands-blocks in 412-423
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 412-423 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 412 blocks
Most active assignees, all time — NPA 412
New assignments by month
Sep 2026
Aug 2026
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Dec 2025
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 412-423-0XXX | 0000–0999 | Reserved | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTGSBNZN20 | PA |
| — | 412-423-1XXX | 1000–1999 | Reserved | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTGSBNZN20 | PA |
| 2001-11-21 | 412-423-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | PTGSBNZN20 | PA |
| 2007-07-25 | 412-423-3XXX | 3000–3999 | Assigned | PAETEC ITEL, LLC | 829J | PTGSBNZN20 | PA |
| 2007-07-25 | 412-423-4XXX | 4000–4999 | Assigned | PAETEC ITEL, LLC | 829J | PTGSBNZN20 | PA |
| 2011-08-29 | 412-423-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - PA | 002F | PTGSBNZN20 | PA |
| 2013-10-25 | 412-423-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - PA | 002F | PTGSBNZN20 | PA |
| 2004-09-13 | 412-423-7XXX | 7000–7999 | Assigned | CITYNET PENNSYLVANIA, LLC - PA | 657B | PTGSBNZN20 | PA |
| 2008-11-21 | 412-423-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - PA | 002F | PTGSBNZN20 | PA |
| 2001-11-05 | 412-423-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PTGSBNZN20 | 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.