NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 2026-04
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
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| Assigned | NPA-NXX | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 2003-04-10 | 203-742 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | GREENWICH | CT |
| 2003-03-18 | 210-234 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SANANTONIO | TX |
| 2003-03-18 | 210-795 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SANANTONIO | TX |
| 2003-03-18 | 480-993 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2003-03-11 | 435-252 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PARK CITY | UT |
| 2003-03-04 | 417-212 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7594 | BLUE EYE | MO |
| 2003-03-04 | 417-213 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7594 | BRANSON | MO |
| 2003-03-04 | 417-215 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7594 | CRANE | MO |
| 2003-03-04 | 417-216 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7594 | GALENA | MO |
| 2003-03-04 | 417-240 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7594 | BRADLEYVL | MO |
| 2003-02-04 | 203-566 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | STAMFORD | CT |
| 2003-02-04 | 203-607 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | STAMFORD | CT |
| 2003-01-22 | 859-629 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LEXINGTON | KY |
| 2003-01-08 | 978-953 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | TOPSFIELD | MA |
| 2002-11-18 | 580-710 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OK | 7258 | PERRY | OK |
| 2002-11-18 | 580-826 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OK | 7258 | ARDMORE | OK |
| 2002-11-14 | 609-939 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ATLNTIC CY | NJ |
| 2002-11-06 | 208-561 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - ID | 678B | BAYVIEW | ID |
| 2002-10-30 | 817-440 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ATLAS | TX |
| 2002-10-29 | 817-622 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ARLINGTON | TX |
| 2002-10-15 | 661-695 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | BKFD NORTH | CA |
| 2002-10-01 | 817-290 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ATLAS | TX |
| 2002-09-27 | 386-693 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | FLAGLERBCH | FL |
| 2002-09-22 | 440-310 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | COLUMBISTA | OH |
| 2002-09-12 | 253-880 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | AUBURN | WA |
| 2002-09-12 | 253-881 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | PUYALLUP | WA |
| 2002-09-12 | 253-882 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | TACOMA | WA |
| 2002-09-12 | 253-883 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | TACOMAWVLY | WA |
| 2002-09-10 | 908-344 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NJ | 7134 | ELIZABETH | NJ |
| 2002-09-05 | 502-554 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LOUISVILLE | KY |
| 2002-08-15 | 208-621 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LAPWAI | ID |
| 2002-08-08 | 850-467 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | FTWALTNBCH | FL |
| 2002-06-27 | 334-414 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MONTGOMERY | AL |
| 2002-06-26 | 740-249 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | ATHENS | OH |
| 2002-06-21 | 567-214 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7158 | BELLEVUE | OH |
| 2002-06-19 | 406-558 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HELENA | MT |
| 2002-06-04 | 508-401 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WAYLAND | MA |
| 2002-06-04 | 508-637 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NOBROOKFLD | MA |
| 2002-05-06 | 419-405 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | CRESTLINE | OH |
| 2002-05-06 | 419-777 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | GALION | OH |
| 2002-05-06 | 803-692 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - SC | 8534 | BISHOPVL | SC |
| 2002-04-08 | 646-720 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NWYRCYZN01 | NY |
| 2002-04-02 | 774-925 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | FRAMINGHAM | MA |
| 2002-04-02 | 937-770 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | BROOKVILLE | OH |
| 2002-03-20 | 312-525 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2002-03-18 | 571-262 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HERNDON | VA |
| 2002-03-15 | 774-256 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WALPOLE | MA |
| 2002-03-13 | 970-797 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | FT COLLINS | CO |
| 2002-03-12 | 248-856 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7279 | AUBURN HTS | MI |
| 2002-03-05 | 352-418 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BUSHNELL | FL |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 2026-04 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.