NumberResearchRecent prefix assignments
5 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/18/2026
Which carriers received which NPA-NXX prefixes, and where. Assignments are initial assignments from NANPA records — because of number portability, the current serving carrier of individual numbers may differ. For finer-grained activity, see the thousands-block view above.
Most active assignees, last 30 days
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| Assigned | NPA-NXX | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 773-544 | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL | |
| 773-552 | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL | |
| 773-556 | T-MOBILE USA, INC. | 6529 | CHICGOZN03 | IL | |
| 773-562 | T-MOBILE USA, INC. | 6529 | CHICGOZN03 | IL | |
| 773-592 | T-MOBILE USA, INC. | 6529 | CHICGOZN03 | IL | |
| 773-593 | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL | |
| 773-616 | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL | |
| 773-617 | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL | |
| 773-663 | T-MOBILE USA, INC. | 6529 | CHICGOZN03 | IL | |
| 773-671 | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL | |
| 773-716 | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL | |
| 773-719 | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL | |
| 773-732 | T-MOBILE USA, INC. | 6529 | CHICGOZN03 | IL | |
| 773-739 | T-MOBILE USA, INC. | 6529 | CHICGOZN02 | IL | |
| 773-746 | T-MOBILE USA, INC. | 6529 | CHICGOZN03 | IL | |
| 773-780 | T-MOBILE USA, INC. | 6529 | CHICGOZN08 | IL | |
| 773-793 | T-MOBILE USA, INC. | 6529 | CHICGOZN03 | IL | |
| 773-808 | T-MOBILE USA, INC. | 6529 | CHICGOZN07 | IL | |
| 773-818 | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL | |
| 773-822 | T-MOBILE USA, INC. | 6529 | CHICGOZN06 | IL | |
| 773-827 | T-MOBILE USA, INC. | 6529 | CHICGOZN06 | IL | |
| 773-879 | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL | |
| 773-908 | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL | |
| 773-960 | T-MOBILE USA, INC. | 6529 | CHICGOZN03 | IL | |
| 773-988 | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL | |
| 773-991 | T-MOBILE USA, INC. | 6529 | CHICGOZN03 | IL | |
| 775-221 | T-MOBILE USA, INC. | 6529 | RENO | NV | |
| 775-247 | T-MOBILE USA, INC. | 6529 | RENO | NV | |
| 775-250 | T-MOBILE USA, INC. | 6529 | RENO | NV | |
| 775-350 | T-MOBILE USA, INC. | 6529 | CARSONCITY | NV | |
| 775-450 | T-MOBILE USA, INC. | 6529 | GARDNERVL | NV | |
| 775-690 | T-MOBILE USA, INC. | 6529 | CARSONCITY | NV | |
| 775-691 | T-MOBILE USA, INC. | 6529 | CARSONCITY | NV | |
| 775-745 | T-MOBILE USA, INC. | 6529 | RENO | NV | |
| 801-259 | T-MOBILE USA, INC. | 6529 | SALT LAKE | UT | |
| 801-301 | T-MOBILE USA, INC. | 6529 | MURRAY | UT | |
| 801-309 | T-MOBILE USA, INC. | 6529 | KAYSVILLE | UT | |
| 801-318 | T-MOBILE USA, INC. | 6529 | PROVO | UT | |
| 801-358 | T-MOBILE USA, INC. | 6529 | PROVO | UT | |
| 801-381 | T-MOBILE USA, INC. | 6529 | SALT LAKE | UT | |
| 801-390 | T-MOBILE USA, INC. | 6529 | KAYSVILLE | UT | |
| 801-400 | T-MOBILE USA, INC. | 6529 | PROVO | UT | |
| 801-403 | T-MOBILE USA, INC. | 6529 | SALT LAKE | UT | |
| 801-404 | T-MOBILE USA, INC. | 6529 | PROVO | UT | |
| 801-414 | T-MOBILE USA, INC. | 6529 | SALT LAKE | UT | |
| 801-420 | T-MOBILE USA, INC. | 6529 | PROVO | UT | |
| 801-458 | T-MOBILE USA, INC. | 6529 | OGDEN | UT | |
| 801-471 | T-MOBILE USA, INC. | 6529 | PROVO | UT | |
| 801-472 | T-MOBILE USA, INC. | 6529 | PROVO | UT | |
| 801-473 | T-MOBILE USA, INC. | 6529 | PROVO | UT |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/18/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.