NumberResearchThousands-blocks in 317-456
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 317-456 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 317 blocks
Most active assignees, all time — NPA 317
New assignments by month
Sep 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2008-04-16 | 317-456-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IN | 4803 | BROWNSBURG | IN |
| 2007-02-13 | 317-456-1XXX | 1000–1999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IN | 7314 | BROWNSBURG | IN |
| 2008-10-28 | 317-456-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - IN | 105F | BROWNSBURG | IN |
| 2025-09-11 | 317-456-3XXX | 3000–3999 | Assigned | TERRA NOVA TELECOM INC. | 145J | BROWNSBURG | IN |
| 2007-09-11 | 317-456-4XXX | 4000–4999 | Assigned | BHN IP ENABLED SERVICES, LLC | 045L | BROWNSBURG | IN |
| 2005-04-22 | 317-456-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN | 7440 | BROWNSBURG | IN |
| 2020-12-18 | 317-456-6XXX | 6000–6999 | Assigned | STRATUS NETWORKS | 495J | BROWNSBURG | IN |
| 2005-11-09 | 317-456-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IN | 4803 | BROWNSBURG | IN |
| 2007-06-12 | 317-456-8XXX | 8000–8999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IN | 7314 | BROWNSBURG | IN |
| 2008-01-30 | 317-456-9XXX | 9000–9999 | Assigned | PAETEC ITEL, LLC | 829J | BROWNSBURG | IN |
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.