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 |
|---|---|---|---|---|---|
| 520-271 | T-MOBILE USA, INC. | 6529 | TUCSON | AZ | |
| 520-280 | T-MOBILE USA, INC. | 6529 | CASAGRANDE | AZ | |
| 520-331 | T-MOBILE USA, INC. | 6529 | TUCSON | AZ | |
| 520-370 | T-MOBILE USA, INC. | 6529 | TUCSON | AZ | |
| 520-390 | T-MOBILE USA, INC. | 6529 | TUCSON | AZ | |
| 520-401 | T-MOBILE USA, INC. | 6529 | TUCSON | AZ | |
| 520-440 | T-MOBILE USA, INC. | 6529 | TUCSON | AZ | |
| 520-450 | T-MOBILE USA, INC. | 6529 | CASAGRANDE | AZ | |
| 520-470 | T-MOBILE USA, INC. | 6529 | NOGALES | AZ | |
| 520-481 | T-MOBILE USA, INC. | 6529 | TUCSON | AZ | |
| 520-491 | T-MOBILE USA, INC. | 6529 | FLAGSTAFF | AZ | |
| 520-631 | T-MOBILE USA, INC. | 6529 | TUCSON | AZ | |
| 520-661 | T-MOBILE USA, INC. | 6529 | TUCSON | AZ | |
| 520-831 | T-MOBILE USA, INC. | 6529 | PRESCOTT | AZ | |
| 520-839 | T-MOBILE USA, INC. | 6529 | NOGALES | AZ | |
| 520-861 | T-MOBILE USA, INC. | 6529 | TUCSON | AZ | |
| 520-869 | T-MOBILE USA, INC. | 6529 | TUCSON | AZ | |
| 520-870 | T-MOBILE USA, INC. | 6529 | TUCSON | AZ | |
| 520-891 | T-MOBILE USA, INC. | 6529 | TUCSON | AZ | |
| 520-921 | T-MOBILE USA, INC. | 6529 | SEDONA | AZ | |
| 520-940 | T-MOBILE USA, INC. | 6529 | TUCSON | AZ | |
| 520-971 | T-MOBILE USA, INC. | 6529 | TUCSON | AZ | |
| 520-977 | T-MOBILE USA, INC. | 6529 | TUCSON | AZ | |
| 520-979 | T-MOBILE USA, INC. | 6529 | TUCSON | AZ | |
| 520-981 | T-MOBILE USA, INC. | 6529 | TUCSON | AZ | |
| 520-982 | T-MOBILE USA, INC. | 6529 | TUCSON | AZ | |
| 520-990 | T-MOBILE USA, INC. | 6529 | TUCSON | AZ | |
| 520-991 | T-MOBILE USA, INC. | 6529 | TUCSON | AZ | |
| 530-216 | T-MOBILE USA, INC. | 6529 | MARYSVILLE | CA | |
| 530-231 | T-MOBILE USA, INC. | 6529 | DAVIS | CA | |
| 530-308 | T-MOBILE USA, INC. | 6529 | AUBN MAIN | CA | |
| 530-321 | T-MOBILE USA, INC. | 6529 | CHICO | CA | |
| 530-330 | T-MOBILE USA, INC. | 6529 | WILLOWS | CA | |
| 530-363 | T-MOBILE USA, INC. | 6529 | PLVL WEST | CA | |
| 530-682 | T-MOBILE USA, INC. | 6529 | MARYSVILLE | CA | |
| 530-903 | T-MOBILE USA, INC. | 6529 | PLVL WEST | CA | |
| 541-206 | T-MOBILE USA, INC. | 6529 | EUGENE | OR | |
| 541-210 | T-MOBILE USA, INC. | 6529 | MEDFORD | OR | |
| 541-220 | T-MOBILE USA, INC. | 6529 | ALBANY | OR | |
| 541-221 | T-MOBILE USA, INC. | 6529 | EUGENE | OR | |
| 541-230 | T-MOBILE USA, INC. | 6529 | CORVALLIS | OR | |
| 541-232 | T-MOBILE USA, INC. | 6529 | EUGENE | OR | |
| 541-250 | T-MOBILE USA, INC. | 6529 | CORVALLIS | OR | |
| 541-279 | T-MOBILE USA, INC. | 6529 | MADRAS | OR | |
| 541-291 | T-MOBILE USA, INC. | 6529 | GRANTSPASS | OR | |
| 541-300 | T-MOBILE USA, INC. | 6529 | THE DALLES | OR | |
| 541-301 | T-MOBILE USA, INC. | 6529 | MEDFORD | OR | |
| 541-310 | T-MOBILE USA, INC. | 6529 | PENDLETON | OR | |
| 541-321 | T-MOBILE USA, INC. | 6529 | JUNCTIONCY | OR | |
| 541-337 | T-MOBILE USA, INC. | 6529 | EUGENE | OR |
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.