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 |
|---|---|---|---|---|---|---|---|
| 2007-01-25 | 231-377-2XXX | 2000–2999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | CLAM RIVER | MI |
| 2007-01-25 | 231-425-3XXX | 3000–3999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | LUDINGTON | MI |
| 2007-01-25 | 231-629-8XXX | 8000–8999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | BIG RAPIDS | MI |
| 2007-01-25 | 231-869-3XXX | 3000–3999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | PENTWATER | MI |
| 2007-01-24 | 231-222-2XXX | 2000–2999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | EASTJORDAN | MI |
| 2007-01-24 | 231-267-3XXX | 3000–3999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | WILLIAMSBG | MI |
| 2007-01-24 | 231-282-7XXX | 7000–7999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | GRANT | MI |
| 2007-01-24 | 231-301-8XXX | 8000–8999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | HART | MI |
| 2007-01-24 | 231-366-6XXX | 6000–6999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | FRUITPORT | MI |
| 2007-01-24 | 231-452-6XXX | 6000–6999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | NEWAYGO | MI |
| 2007-01-24 | 231-459-4XXX | 4000–4999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | BOYNE CITY | MI |
| 2007-01-24 | 231-498-2XXX | 2000–2999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | ELK RAPIDS | MI |
| 2007-01-24 | 231-535-6XXX | 6000–6999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | WALLOON LK | MI |
| 2007-01-24 | 231-824-4XXX | 4000–4999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | MANTON | MI |
| 2007-01-24 | 231-889-7XXX | 7000–7999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | ONEKAMA | MI |
| 2007-01-24 | 231-894-0XXX | 0000–0999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | WHITEHALL | MI |
| 2007-01-23 | 231-242-4XXX | 4000–4999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | HARBOR SPG | MI |
| 2007-01-23 | 231-276-3XXX | 3000–3999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | INTERLOCHN | MI |
| 2007-01-23 | 231-383-4XXX | 4000–4999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | BEULAH | MI |
| 2007-01-23 | 231-384-6XXX | 6000–6999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | KALKASKA | MI |
| 2007-01-23 | 231-386-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | NORTHPORT | MI |
| 2007-01-23 | 231-399-0XXX | 0000–0999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | FRANKFORT | MI |
| 2007-01-23 | 231-421-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | TRAVERSECY | MI |
| 2007-01-23 | 231-437-3XXX | 3000–3999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | CHARLEVOIX | MI |
| 2007-01-23 | 231-544-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | CENTRAL LK | MI |
| 2007-01-23 | 231-916-2XXX | 2000–2999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | MANCELONA | MI |
| 2007-01-23 | 231-994-2XXX | 2000–2999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | LKLEELANAU | MI |
| 2007-01-17 | 231-307-3XXX | 3000–3999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | MORLEY | MI |
| 2007-01-17 | 231-465-4XXX | 4000–4999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | REED CITY | MI |
| 2007-01-17 | 231-468-2XXX | 2000–2999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | CADILLAC | MI |
| 2007-01-17 | 231-622-8XXX | 8000–8999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | PETOSKEY | MI |
| 2007-01-17 | 231-648-6XXX | 6000–6999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | HOWARDCITY | MI |
| 2007-01-17 | 231-828-0XXX | 0000–0999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | TWIN LAKE | MI |
| 2007-01-17 | 231-879-6XXX | 6000–6999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | FIFE LAKE | MI |
| 2007-01-17 | 231-887-4XXX | 4000–4999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | MANISTEE | MI |
| 2007-01-16 | 231-794-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | MANISTEE | MI |
| 2007-01-10 | 231-350-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | BELLAIRE | MI |
| 2007-01-09 | 231-288-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | MUSKEGON | MI |
| 2007-01-09 | 231-288-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | MUSKEGON | MI |
| 2007-01-04 | 231-629-5XXX | 5000–5999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | BIG RAPIDS | MI |
| 2007-01-04 | 231-736-4XXX | 4000–4999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | MUSKEGON | MI |
| 2006-12-20 | 231-855-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | MUSKEGON | MI |
| 2006-12-19 | 231-383-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | BEULAH | MI |
| 2006-12-15 | 231-408-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | BIG RAPIDS | MI |
| 2006-12-15 | 231-408-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | BIG RAPIDS | MI |
| 2006-12-15 | 231-887-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | MANISTEE | MI |
| 2006-12-15 | 231-887-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | MANISTEE | MI |
| 2006-12-15 | 231-930-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | BEULAH | MI |
| 2006-12-15 | 231-930-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | BEULAH | MI |
| 2006-12-15 | 231-942-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | CADILLAC | 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.