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.
Most active assignees, all time
New assignments by month
Sep 2026
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Oct 2025
| Assigned | NPA-NXX | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 2005-05-18 | 503-922 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PORTLAND | OR |
| 2005-05-18 | 662-824 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | BOONEVILLE | MS |
| 2005-05-12 | 252-777 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | NEWPORT | NC |
| 2005-05-12 | 724-540 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | FREEPORT | PA |
| 2005-05-12 | 724-687 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MARS | PA |
| 2005-05-12 | 724-903 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | COOPERSTWN | PA |
| 2005-05-11 | 336-799 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | RANDLEMAN | NC |
| 2005-05-09 | 210-745 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SANANTONIO | TX |
| 2005-05-09 | 252-405 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | WARRENTON | NC |
| 2005-05-09 | 252-515 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | MOREHEADCY | NC |
| 2005-05-09 | 832-518 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2005-05-04 | 317-747 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN | 7440 | FORTVILLE | IN |
| 2005-05-02 | 347-750 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | NWYRCYZN06 | NY |
| 2005-05-02 | 646-688 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NWYRCYZN01 | NY |
| 2005-04-25 | 336-754 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | WALKERTOWN | NC |
| 2005-04-19 | 702-664 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | JEAN | NV |
| 2005-04-13 | 336-444 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | PILOT MT | NC |
| 2005-04-13 | 336-551 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | BOONVILLE | NC |
| 2005-04-13 | 336-949 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | MADISON | NC |
| 2005-04-13 | 910-828 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | BISCOE | NC |
| 2005-04-12 | 606-314 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | GREENUP | KY |
| 2005-04-12 | 606-388 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | RUSSELL | KY |
| 2005-04-12 | 606-405 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CATLETTSBG | KY |
| 2005-03-31 | 801-769 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PLEASATGRV | UT |
| 2005-03-24 | 801-660 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | KAYSVILLE | UT |
| 2005-03-23 | 814-403 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ERIE | PA |
| 2005-03-22 | 251-697 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | FLOMATON | AL |
| 2005-03-22 | 330-917 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | MARLBORO | OH |
| 2005-03-22 | 330-980 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | WARREN | OH |
| 2005-03-16 | 252-886 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | ROCKYMOUNT | NC |
| 2005-03-16 | 517-233 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7157 | EATON RPD | MI |
| 2005-03-16 | 517-345 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7157 | DIMONDALE | MI |
| 2005-03-16 | 517-444 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7157 | CHARLOTTE | MI |
| 2005-03-15 | 336-455 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | GREENSBORO | NC |
| 2005-03-15 | 910-599 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | WILMINGTON | NC |
| 2005-03-08 | 937-714 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | UNION CITY | OH |
| 2005-03-01 | 740-527 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | HEBRON | OH |
| 2005-02-24 | 419-718 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | CARDINGTON | OH |
| 2005-02-24 | 740-848 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | FREDERCKTN | OH |
| 2005-02-24 | 937-887 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | W LIBERTY | OH |
| 2005-02-18 | 330-943 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | SHREVE | OH |
| 2005-02-18 | 419-719 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BELLVILLE | OH |
| 2005-02-18 | 567-216 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | SHELBY | OH |
| 2005-02-18 | 606-744 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ASHLAND | KY |
| 2005-02-15 | 937-662 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | ARCANUM | OH |
| 2005-02-14 | 765-333 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN | 7440 | UNION CITY | IN |
| 2005-02-14 | 937-810 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | RUSSELLSPT | OH |
| 2005-02-11 | 517-466 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7157 | DANSVILLE | MI |
| 2005-01-31 | 203-307 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | FAIRFIELD | CT |
| 2005-01-31 | 203-898 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | DARIEN | CT |
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.