NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026
The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2025-12-16 | 671-996 | not yet reported which blocks → | GUAM WIRELESS TELEPHONE COMPANY, LLC | 3945 | AGANA | GU |
| 2025-12-16 | 671-999 | not yet reported which blocks → | GUAM WIRELESS TELEPHONE COMPANY, LLC | 3945 | AGANA | GU |
| 2025-12-04 | 671-991 | not yet reported which blocks → | GUAM WIRELESS TELEPHONE COMPANY, LLC | 3945 | AGANA | GU |
| 2016-02-26 | 671-683 | not yet reported which blocks → | GUAM WIRELESS TELEPHONE COMPANY, LLC | 3945 | AGANA | GU |
| 2016-02-19 | 671-682 | not yet reported which blocks → | GUAM WIRELESS TELEPHONE COMPANY, LLC | 3945 | AGANA | GU |
| 2009-11-05 | 671-685 | not yet reported which blocks → | GUAM WIRELESS TELEPHONE COMPANY, LLC | 3945 | AGANA | GU |
| 2008-04-09 | 671-929 | not yet reported which blocks → | GUAM WIRELESS TELEPHONE COMPANY, LLC | 3945 | AGANA | GU |
| 2003-03-04 | 671-988 | not yet reported which blocks → | GUAM WIRELESS TELEPHONE COMPANY, LLC | 3945 | AGANA | GU |
| 2002-06-13 | 671-787 | not yet reported which blocks → | GUAM WIRELESS TELEPHONE COMPANY, LLC | 3945 | AGANA | GU |
| 2001-11-20 | 671-686 | not yet reported which blocks → | GUAM WIRELESS TELEPHONE COMPANY, LLC | 3945 | AGANA | GU |
| — | 671-687 | not yet reported which blocks → | GUAM WIRELESS TELEPHONE COMPANY, LLC | 3945 | AGANA | GU |
| — | 671-688 | not yet reported which blocks → | GUAM WIRELESS TELEPHONE COMPANY, LLC | 3945 | AGANA | GU |
| — | 671-689 | not yet reported which blocks → | GUAM WIRELESS TELEPHONE COMPANY, LLC | 3945 | AGANA | GU |
| — | 671-788 | not yet reported which blocks → | GUAM WIRELESS TELEPHONE COMPANY, LLC | 3945 | AGANA | GU |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.