NumberResearchRecent thousands-block assignments
7 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 231
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 |
|---|---|---|---|---|---|---|---|
| 2008-09-18 | 231-450-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | HESPERIA | MI |
| 2008-09-10 | 231-527-4XXX | 4000–4999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | BIG RAPIDS | MI |
| 2008-09-08 | 231-944-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | TRAVERSECY | MI |
| 2008-09-08 | 231-944-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | TRAVERSECY | MI |
| 2008-09-05 | 231-350-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | BELLAIRE | MI |
| 2008-09-05 | 231-399-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | FRANKFORT | MI |
| 2008-09-05 | 231-879-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | FIFE LAKE | MI |
| 2008-08-28 | 231-760-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | MUSKEGON | MI |
| 2008-08-28 | 231-760-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | MUSKEGON | MI |
| 2008-08-28 | 231-760-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | MUSKEGON | MI |
| 2008-08-20 | 231-942-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - MI | 770E | CADILLAC | MI |
| 2008-08-15 | 231-539-3XXX | 3000–3999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | PELLSTON | MI |
| 2008-08-15 | 231-588-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | ELLSWORTH | MI |
| 2008-08-08 | 231-518-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - MI | 770E | KALKASKA | MI |
| 2008-08-05 | 231-384-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | KALKASKA | MI |
| 2008-08-05 | 231-425-4XXX | 4000–4999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | LUDINGTON | MI |
| 2008-08-01 | 231-613-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | SCOTTVILLE | MI |
| 2008-07-22 | 231-421-5XXX | 5000–5999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | TRAVERSECY | MI |
| 2008-07-14 | 231-268-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHEBOYGAN | MI |
| 2008-07-14 | 231-268-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHEBOYGAN | MI |
| 2008-06-10 | 231-486-1XXX | 1000–1999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | TRAVERSECY | MI |
| 2008-06-10 | 231-760-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | MUSKEGON | MI |
| 2008-06-06 | 231-944-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | TRAVERSECY | MI |
| 2008-06-05 | 231-239-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | LUDINGTON | MI |
| 2008-06-04 | 231-508-0XXX | 0000–0999 | Assigned | KALEVA TELEPHONE COMPANY - MI | 392F | ONEKAMA | MI |
| 2008-05-30 | 231-887-6XXX | 6000–6999 | Assigned | KALEVA TELEPHONE COMPANY - MI | 392F | MANISTEE | MI |
| 2008-04-28 | 231-307-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | MORLEY | MI |
| 2008-04-28 | 231-307-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | MORLEY | MI |
| 2008-04-28 | 231-459-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | BOYNE CITY | MI |
| 2008-04-28 | 231-676-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | BELLAIRE | MI |
| 2008-04-15 | 231-515-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | EVART | MI |
| 2008-04-11 | 231-564-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | KALKASKA | MI |
| 2008-04-07 | 231-373-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | PETOSKEY | MI |
| 2008-04-07 | 231-373-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | PETOSKEY | MI |
| 2008-04-07 | 231-373-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | PETOSKEY | MI |
| 2008-03-06 | 231-747-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | MUSKEGON | MI |
| 2008-03-06 | 231-747-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | MUSKEGON | MI |
| 2008-03-06 | 231-747-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | MUSKEGON | MI |
| 2008-03-06 | 231-747-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | MUSKEGON | MI |
| 2008-03-03 | 231-742-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | HART | MI |
| 2008-02-27 | 231-238-2XXX | 2000–2999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | INDIAN RIV | MI |
| 2008-02-27 | 231-268-3XXX | 3000–3999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | CHEBOYGAN | MI |
| 2008-02-27 | 231-436-6XXX | 6000–6999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | MACKINAWCY | MI |
| 2008-02-26 | 231-872-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | REED CITY | MI |
| 2008-02-14 | 231-259-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | SHELBY | MI |
| 2008-02-12 | 231-421-3XXX | 3000–3999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | TRAVERSECY | MI |
| 2008-02-07 | 231-672-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | MUSKEGON | MI |
| 2008-01-31 | 231-242-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | HARBOR SPG | MI |
| 2008-01-31 | 231-720-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | MUSKEGON | MI |
| 2008-01-11 | 231-452-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | NEWAYGO | 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.