NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/23/2026
Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.
Most active assignees, all time — NPA 517
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2013-06-20 | 517-252-3XXX | 3000–3999 | Assigned | DEERFIELD FARMERS' TELEPHONE COMPANY - MI | 558A | ADDISON | MI |
| 2012-10-19 | 517-595-4XXX | 4000–4999 | Assigned | DEERFIELD FARMERS' TELEPHONE COMPANY - MI | 558A | WALDRON | MI |
| 2012-03-07 | 517-445-3XXX | 3000–3999 | Assigned | DEERFIELD FARMERS' TELEPHONE COMPANY - MI | 558A | CLAYTON | MI |
| 2011-08-29 | 517-431-1XXX | 1000–1999 | Assigned | DEERFIELD FARMERS' TELEPHONE COMPANY - MI | 558A | TIPTON | MI |
| 2011-08-29 | 517-436-2XXX | 2000–2999 | Assigned | DEERFIELD FARMERS' TELEPHONE COMPANY - MI | 558A | SAND CREEK | MI |
| 2011-08-29 | 517-443-2XXX | 2000–2999 | Assigned | DEERFIELD FARMERS' TELEPHONE COMPANY - MI | 558A | OGDEN CTR | MI |
| 2008-03-21 | 517-701-1XXX | 1000–1999 | Assigned | DEERFIELD FARMERS' TELEPHONE COMPANY - MI | 558A | CLINTON | MI |
| 2008-02-20 | 517-301-4XXX | 4000–4999 | Assigned | DEERFIELD FARMERS' TELEPHONE COMPANY - MI | 558A | TECUMSEH | MI |
| 2007-01-16 | 517-759-3XXX | 3000–3999 | Assigned | DEERFIELD FARMERS' TELEPHONE COMPANY - MI | 558A | ADRIAN | MI |
| 2006-05-02 | 517-448-1XXX | 1000–1999 | Assigned | DEERFIELD FARMERS' TELEPHONE COMPANY - MI | 558A | HUDSON | MI |
| 2006-05-02 | 517-458-3XXX | 3000–3999 | Assigned | DEERFIELD FARMERS' TELEPHONE COMPANY - MI | 558A | MORENCI | MI |
| 2005-02-09 | 517-451-0XXX | 0000–0999 | Assigned | DEERFIELD FARMERS' TELEPHONE COMPANY - MI | 558A | BRITTON | MI |
| 2003-05-07 | 517-682-1XXX | 1000–1999 | Assigned | DEERFIELD FARMERS' TELEPHONE COMPANY - MI | 558A | BLISSFIELD | MI |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/23/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.