NumberResearchRecent thousands-block assignments
10 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026
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, last 30 days — NPA 517
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-12-07 | 517-996-5XXX | 5000–5999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | WILLIAMSTN | MI |
| 2015-12-04 | 517-200-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | LITCHFIELD | 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 | 517-790-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | MOSHERVL | 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 | 517-253-9XXX | 9000–9999 | Assigned | ONVOY, LLCV - MI | 543C | LANSING | MI |
| 2015-12-03 | 517-272-8XXX | 8000–8999 | Assigned | ONVOY, LLCV - MI | 543C | LANSING | 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 | 517-897-9XXX | 9000–9999 | Assigned | ONVOY, LLCV - MI | 543C | LANSING | 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 |
| 2015-12-02 | 517-657-9XXX | 9000–9999 | Assigned | ONVOY, LLCV - MI | 543C | LANSING | MI |
| 2015-12-01 | 517-657-0XXX | 0000–0999 | Assigned | ONVOY, LLCV - MI | 543C | LANSING | MI |
| 2015-11-23 | 517-388-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | LANSING | MI |
| 2015-11-18 | 517-225-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | HOWELL | MI |
| 2015-11-18 | 517-225-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | HOWELL | MI |
| 2015-11-18 | 517-815-3XXX | 3000–3999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - MI | 770E | TECUMSEH | MI |
| 2015-11-18 | 517-885-3XXX | 3000–3999 | Assigned | ONVOY, LLCV - MI | 543C | LANSING | MI |
| 2015-11-12 | 517-885-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | LANSING | MI |
| 2015-11-10 | 517-388-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | LANSING | MI |
| 2015-10-26 | 517-708-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | LANSING | MI |
| 2015-10-26 | 517-940-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | LANSING | MI |
| 2015-10-26 | 517-940-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | LANSING | MI |
| 2015-10-26 | 517-940-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | LANSING | MI |
| 2015-10-26 | 517-940-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | LANSING | MI |
| 2015-10-26 | 517-940-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | LANSING | MI |
| 2015-10-15 | 517-220-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | LANSING | MI |
| 2015-10-15 | 517-457-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - MI | 770E | TIPTON | MI |
| 2015-09-22 | 517-245-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | FOWLERVL | MI |
| 2015-09-15 | 517-435-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | JACKSON | MI |
| 2015-09-11 | 517-901-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - MI | 770E | READING | MI |
| 2015-09-10 | 517-252-2XXX | 2000–2999 | Assigned | ONVOY, LLCV - MI | 543C | ADDISON | MI |
| 2015-09-10 | 517-252-9XXX | 9000–9999 | Assigned | ONVOY, LLCV - MI | 543C | ADDISON | MI |
| 2015-08-31 | 517-539-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | JACKSON | MI |
| 2015-08-18 | 517-756-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | UNION CITY | MI |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.