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 |
|---|---|---|---|---|---|---|---|
| 2006-01-19 | 517-222-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7157 | DANSVILLE | MI |
| 2006-01-19 | 517-222-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7157 | DANSVILLE | MI |
| 2006-01-19 | 517-222-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7157 | DANSVILLE | MI |
| 2006-01-18 | 517-990-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | JACKSON | MI |
| 2006-01-13 | 517-889-0XXX | 0000–0999 | Assigned | PAETEC ITEL, LLC | 829J | HOLT | MI |
| 2006-01-13 | 517-969-0XXX | 0000–0999 | Assigned | PAETEC ITEL, LLC | 829J | MASON | MI |
| 2006-01-10 | 517-575-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | LANSING | MI |
| 2006-01-10 | 517-612-5XXX | 5000–5999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | JACKSON | MI |
| 2006-01-10 | 517-908-6XXX | 6000–6999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | LANSING | MI |
| 2006-01-04 | 517-588-7XXX | 7000–7999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | CHARLOTTE | MI |
| 2006-01-04 | 517-803-8XXX | 8000–8999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | LANSING | MI |
| 2006-01-04 | 517-945-4XXX | 4000–4999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | JACKSON | MI |
| 2006-01-03 | 517-442-2XXX | 2000–2999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | ADRIAN | MI |
| 2005-12-30 | 517-615-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | VERMONTVL | MI |
| 2005-12-28 | 517-575-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | LANSING | MI |
| 2005-12-27 | 517-612-4XXX | 4000–4999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | JACKSON | MI |
| 2005-12-15 | 517-507-8XXX | 8000–8999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | LANSING | MI |
| 2005-12-15 | 517-879-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | JACKSON | MI |
| 2005-12-15 | 517-879-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | JACKSON | MI |
| 2005-12-15 | 517-879-3XXX | 3000–3999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | JACKSON | MI |
| 2005-12-13 | 517-990-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | JACKSON | MI |
| 2005-12-06 | 517-219-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | FOWLERVL | MI |
| 2005-12-06 | 517-536-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | NAPOLEON | MI |
| 2005-12-06 | 517-565-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | FITCHBURG | MI |
| 2005-12-06 | 517-649-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | MULLIKEN | MI |
| 2005-12-06 | 517-714-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | BURLINGTON | MI |
| 2005-12-01 | 517-224-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | POTTERVL | MI |
| 2005-12-01 | 517-345-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | DIMONDALE | MI |
| 2005-12-01 | 517-878-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | LESLIE | MI |
| 2005-11-30 | 517-233-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | EATON RPD | MI |
| 2005-11-30 | 517-797-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | HILLSDALE | MI |
| 2005-11-30 | 517-833-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | MASON | MI |
| 2005-11-29 | 517-518-5XXX | 5000–5999 | Assigned | ACD TELECOM, INC. - MI | 3535 | HOWELL | MI |
| 2005-11-17 | 517-222-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | DANSVILLE | MI |
| 2005-11-17 | 517-588-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | CHARLOTTE | MI |
| 2005-11-17 | 517-680-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | ALBION | MI |
| 2005-10-31 | 517-488-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | LANSING | MI |
| 2005-10-17 | 517-442-3XXX | 3000–3999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | ADRIAN | MI |
| 2005-10-17 | 517-600-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7157 | DIMONDALE | MI |
| 2005-10-17 | 517-600-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7157 | DIMONDALE | MI |
| 2005-10-17 | 517-600-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7157 | DIMONDALE | MI |
| 2005-10-17 | 517-600-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7157 | DIMONDALE | MI |
| 2005-10-17 | 517-600-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7157 | DIMONDALE | MI |
| 2005-10-17 | 517-600-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7157 | DIMONDALE | MI |
| 2005-10-13 | 517-583-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | TEKONSHA | MI |
| 2005-10-13 | 517-743-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | PORTLAND | MI |
| 2005-10-11 | 517-876-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7157 | HOLT | MI |
| 2005-10-11 | 517-876-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7157 | HOLT | MI |
| 2005-10-11 | 517-876-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7157 | HOLT | MI |
| 2005-10-11 | 517-876-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7157 | HOLT | 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.