NumberResearchRecent prefix assignments
0 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.
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| Assigned | NPA-NXX | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 2024-01-08 | 520-725 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-12-14 | 765-835 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | RICHMOND | IN |
| 2023-10-25 | 227-219 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ASHTON236 | MD |
| 2023-10-17 | 603-805 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | CONCORD | NH |
| 2023-10-17 | 838-280 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ALBANY | NY |
| 2023-08-31 | 520-684 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-08-31 | 520-687 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-08-31 | 520-691 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-08-31 | 520-692 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-08-31 | 520-693 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-08-15 | 227-203 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | FREDERICK | MD |
| 2023-05-08 | 878-274 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SLIPPERYRK | PA |
| 2023-05-03 | 781-946 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MEDFORD | MA |
| 2023-04-10 | 771-229 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN1 | DC |
| 2023-04-06 | 771-225 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN1 | DC |
| 2023-04-06 | 771-226 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN1 | DC |
| 2023-04-06 | 771-227 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN1 | DC |
| 2023-04-06 | 771-228 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN1 | DC |
| 2023-04-06 | 771-230 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN1 | DC |
| 2023-04-06 | 771-231 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN1 | DC |
| 2023-03-31 | 256-988 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HUNTSVILLE | AL |
| 2023-03-31 | 530-940 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | AUBN MAIN | CA |
| 2023-03-09 | 520-669 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-03-09 | 520-671 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-03-09 | 520-672 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-03-09 | 520-673 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-03-09 | 520-674 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | SIERRAVIST | AZ |
| 2023-03-08 | 224-494 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DUNDEE | IL |
| 2023-03-01 | 564-230 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BREMERTON | WA |
| 2023-02-22 | 615-954 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2023-02-21 | 943-217 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - GA | 7435 | BUFORD | GA |
| 2023-02-08 | 667-424 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ODENTON | MD |
| 2023-02-07 | 301-726 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | KITZMILLER | MD |
| 2023-02-01 | 352-774 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | GAINESVL | FL |
| 2023-02-01 | 386-363 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DAYTONABCH | FL |
| 2023-02-01 | 448-216 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PENSACOLA | FL |
| 2023-01-24 | 417-603 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SPRINGFLD | MO |
| 2023-01-24 | 463-282 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | INDIANAPLS | IN |
| 2023-01-23 | 206-815 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SEATTLE | WA |
| 2023-01-23 | 206-820 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SEATTLE | WA |
| 2023-01-23 | 206-827 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SEATTLE | WA |
| 2023-01-23 | 206-831 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SEATTLE | WA |
| 2023-01-23 | 206-836 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SEATTLE | WA |
| 2023-01-20 | 816-543 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | KANSASCITY | MO |
| 2023-01-19 | 571-607 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNGTNZN08 | VA |
| 2023-01-19 | 571-608 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNGTNZN08 | VA |
| 2023-01-19 | 571-610 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNGTNZN08 | VA |
| 2023-01-19 | 571-613 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNGTNZN08 | VA |
| 2023-01-19 | 571-614 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNGTNZN08 | VA |
| 2023-01-18 | 970-851 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | FT COLLINS | CO |
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.