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
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| Assigned | NPA-NXX | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 2016-07-22 | 812-928 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN | 7440 | CRANE | IN |
| 2016-07-18 | 469-886 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DALLAS | TX |
| 2016-07-11 | 442-295 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BARSTOW | CA |
| 2016-06-29 | 681-241 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | GLENVILLE | WV |
| 2016-06-23 | 712-430 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MALVERN | IA |
| 2016-06-20 | 312-824 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2016-06-14 | 812-904 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN | 7440 | HANOVER | IN |
| 2016-06-13 | 765-801 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN | 7440 | MANILLA | IN |
| 2016-06-10 | 260-412 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN | 7440 | ASHLEY | IN |
| 2016-06-01 | 424-388 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | MALIBU | CA |
| 2016-05-27 | 442-286 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | ESCONDIDO | CA |
| 2016-05-23 | 425-690 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | RENTON | WA |
| 2016-05-18 | 380-202 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | REYNOLDSBG | OH |
| 2016-05-17 | 629-303 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2016-05-17 | 786-971 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | KEYS | FL |
| 2016-05-16 | 209-237 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | TRACY | CA |
| 2016-05-16 | 424-318 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | TORRANCE | CA |
| 2016-04-25 | 440-857 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | CLEVELAND | OH |
| 2016-03-30 | 646-802 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NWYRCYZN01 | NY |
| 2016-03-30 | 929-303 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | NWYRCYZN03 | NY |
| 2016-03-29 | 731-319 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | TIPTONVL | TN |
| 2016-03-25 | 480-407 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2016-03-25 | 762-214 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - GA | 7435 | EASTANOLLE | GA |
| 2016-03-23 | 804-206 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - VA | 7238 | DINWIDDIE | VA |
| 2016-03-18 | 864-448 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - SC | 8534 | GREENVILLE | SC |
| 2016-03-14 | 762-213 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - GA | 7435 | COMER | GA |
| 2016-03-09 | 551-203 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | JERSEYCITY | NJ |
| 2016-03-08 | 206-401 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | RICHMNDBCH | WA |
| 2016-02-26 | 603-901 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | CONWAY | NH |
| 2016-02-22 | 575-205 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM | 7464 | TUCUMCARI | NM |
| 2016-02-18 | 385-489 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BOUNTIFUL | UT |
| 2016-02-12 | 470-291 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - GA | 7435 | BARNESVL | GA |
| 2016-02-11 | 731-318 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MILAN | TN |
| 2016-02-11 | 731-330 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | TRENTON | TN |
| 2016-01-29 | 346-232 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HOUSTON | TX |
| 2016-01-28 | 385-331 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | AMERCNFORK | UT |
| 2016-01-28 | 505-355 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM | 7464 | ALBUQURQUE | NM |
| 2016-01-28 | 575-659 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM | 7464 | LOVINGTON | NM |
| 2016-01-27 | 252-351 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | GREENVILLE | NC |
| 2016-01-25 | 956-403 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHARR | TX |
| 2016-01-22 | 646-954 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | NWYRCYZN01 | NY |
| 2016-01-20 | 314-376 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7432 | ST LOUIS | MO |
| 2016-01-20 | 913-249 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - KS | 7593 | KANSASCITY | KS |
| 2016-01-18 | 702-820 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NV | 9145 | LAS VEGAS | NV |
| 2016-01-15 | 206-413 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SEATTLE | WA |
| 2016-01-06 | 240-657 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | FROSTBURG | MD |
| 2016-01-04 | 304-427 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HILLSBORO | WV |
| 2015-12-28 | 307-226 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | AFTON | WY |
| 2015-12-24 | 531-224 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | AUBURN | NE |
| 2015-12-22 | 325-302 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BAIRD | TX |
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.