NumberResearchThousands-blocks in 412-356
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 412-356 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
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2004-03-31 | 412-356-0XXX | 0000–0999 | Assigned | CORE COMMUNICATIONS, INC. - PA | 3806 | PTGSBNZN16 | PA |
| 2003-09-30 | 412-356-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | PTGSBNZN16 | PA |
| — | 412-356-2XXX | 2000–2999 | Reserved | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PTGSBNZN16 | PA |
| 2013-11-27 | 412-356-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - PA | 002F | PTGSBNZN16 | PA |
| — | 412-356-4XXX | 4000–4999 | Available | PTGSBNZN16 | PA | ||
| 2015-03-05 | 412-356-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | PTGSBNZN16 | PA |
| — | 412-356-6XXX | 6000–6999 | Available | PTGSBNZN16 | PA | ||
| 2015-05-18 | 412-356-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | PTGSBNZN16 | PA |
| 2017-07-24 | 412-356-8XXX | 8000–8999 | Assigned | TELNYX LLC | 073H | PTGSBNZN16 | PA |
| 2020-04-06 | 412-356-9XXX | 9000–9999 | Assigned | ONVOY, LLC - PA | 547E | PTGSBNZN16 | 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.