NumberResearchThousands-blocks in 412-283
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
The ten 1,000-number thousand-blocks inside prefix 412-283 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 412-283-0XXX | 0000–0999 | Reserved | FIDIUM ENTERPRISE SERVICES, LLC | 8597 | PTGSBNZN12 | PA |
| — | 412-283-1XXX | 1000–1999 | Available | PTGSBNZN12 | PA | ||
| 2004-03-31 | 412-283-2XXX | 2000–2999 | Assigned | CORE COMMUNICATIONS, INC. - PA | 3806 | PTGSBNZN12 | PA |
| 2018-11-13 | 412-283-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | PTGSBNZN12 | PA |
| 2013-06-21 | 412-283-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | PTGSBNZN12 | PA |
| 2018-08-20 | 412-283-5XXX | 5000–5999 | Assigned | ONVOY, LLC - PA | 547E | PTGSBNZN12 | PA |
| 2011-03-03 | 412-283-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PTGSBNZN12 | PA |
| 2004-09-13 | 412-283-7XXX | 7000–7999 | Assigned | CITYNET PENNSYLVANIA, LLC - PA | 657B | PTGSBNZN12 | PA |
| 2013-07-30 | 412-283-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | PTGSBNZN12 | PA |
| 2003-10-24 | 412-283-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PTGSBNZN12 | PA |
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.