NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026
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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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2017-10-26 | 517-446-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | ONSTED | MI |
| 2015-12-22 | 517-991-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CAMDEN | MI |
| 2015-12-17 | 517-245-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | FOWLERVL | MI |
| 2015-12-07 | 517-224-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | POTTERVL | MI |
| 2015-12-07 | 517-901-5XXX | 5000–5999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | READING | MI |
| 2015-12-07 | 517-984-1XXX | 1000–1999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | WEBBERVL | MI |
| 2015-12-07 | 517-996-5XXX | 5000–5999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | WILLIAMSTN | MI |
| 2015-12-04 | 517-212-2XXX | 2000–2999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | HILLSDALE | MI |
| 2015-12-04 | 517-589-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | LESLIE | MI |
| 2015-12-04 | 517-604-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MASON | MI |
| 2015-12-04 | 517-628-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | ONONDAGA | MI |
| 2015-12-04 | 517-684-1XXX | 1000–1999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | NAPOLEON | MI |
| 2015-12-04 | 517-743-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | PORTLAND | MI |
| 2015-12-04 | 517-760-1XXX | 1000–1999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | NASHVILLE | MI |
| 2015-12-04 | 517-777-2XXX | 2000–2999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | HOLT | MI |
| 2015-12-04 | 517-888-2XXX | 2000–2999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | JACKSON | MI |
| 2015-12-04 | 517-929-2XXX | 2000–2999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | HOMER | MI |
| 2015-12-03 | 517-305-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CLARKLAKE | MI |
| 2015-12-03 | 517-343-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | ALBION | MI |
| 2015-12-03 | 517-616-2XXX | 2000–2999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | DIMONDALE | MI |
| 2015-12-03 | 517-731-3XXX | 3000–3999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | GRANDLEDGE | MI |
| 2015-12-03 | 517-836-8XXX | 8000–8999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | EATON RPD | MI |
| 2015-12-03 | 517-900-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BUNDY HILL | MI |
| 2015-12-03 | 517-903-5XXX | 5000–5999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BATH | MI |
| 2015-12-03 | 517-921-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | ADDISON | MI |
| 2015-12-03 | 517-932-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | ALLEN | MI |
| 2015-12-03 | 517-983-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CHARLOTTE | MI |
| 2015-10-15 | 517-220-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | LANSING | MI |
| 2015-08-18 | 517-756-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | UNION CITY | MI |
| 2015-08-13 | 517-462-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | COLDWATER | MI |
| 2015-08-13 | 517-774-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | COLDWTR LK | MI |
| 2015-08-12 | 517-858-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BRONSON | MI |
| 2014-08-22 | 517-301-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | TECUMSEH | MI |
| 2014-06-12 | 517-295-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | HOWELL | MI |
| 2014-03-14 | 517-208-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BRITTON | MI |
| 2014-03-14 | 517-429-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | HUDSON | MI |
| 2014-03-07 | 517-401-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MORENCI | MI |
| 2014-03-07 | 517-431-9XXX | 9000–9999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | TIPTON | MI |
| 2014-02-24 | 517-409-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BLISSFIELD | MI |
| 2014-02-24 | 517-701-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CLINTON | MI |
| 2014-01-10 | 517-366-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | ADRIAN | MI |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.