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 |
|---|---|---|---|---|---|
| 2015-05-14 | 980-312 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | CHARLOTTE | NC |
| 2015-05-13 | 602-883 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2015-05-13 | 954-945 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | FTLAUDERDL | FL |
| 2015-05-08 | 469-646 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DALLAS | TX |
| 2015-05-06 | 252-863 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | MAMIE | NC |
| 2015-05-05 | 916-738 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | SCRM MAIN | CA |
| 2015-04-21 | 661-564 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | BKFD SOUTH | CA |
| 2015-04-14 | 314-366 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7432 | ST LOUIS | MO |
| 2015-04-10 | 424-359 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | BEVERLYHLS | CA |
| 2015-04-10 | 845-792 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | PIERMONT | NY |
| 2015-04-09 | 225-508 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BATONROUGE | LA |
| 2015-04-09 | 786-747 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | MIAMI | FL |
| 2015-04-03 | 770-705 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - GA | 7435 | ATLANTA NE | GA |
| 2015-03-23 | 312-897 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2015-03-18 | 920-949 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | KAUKAUNA | WI |
| 2015-03-17 | 234-931 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | CANALFULTN | OH |
| 2015-03-17 | 302-516 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE | 7220 | WILMINGTON | DE |
| 2015-03-16 | 864-714 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - SC | 8534 | FOUNTANINN | SC |
| 2015-03-10 | 571-665 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HERNDON | VA |
| 2015-03-09 | 929-371 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | NWYRCYZN04 | NY |
| 2015-03-04 | 757-527 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - VA | 7238 | NWPTNWSZN3 | VA |
| 2015-02-24 | 779-804 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | PONTIAC | IL |
| 2015-02-19 | 929-382 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | NWYRCYZN06 | NY |
| 2015-02-16 | 470-441 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | COVINGTON | GA |
| 2015-02-12 | 424-301 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | EL SEGUNDO | CA |
| 2015-02-12 | 909-313 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHINO | CA |
| 2015-02-11 | 623-759 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2015-02-10 | 551-256 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | JERSEYCITY | NJ |
| 2015-02-09 | 312-517 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2015-02-09 | 720-773 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO |
| 2015-02-05 | 757-205 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - VA | 7238 | NRFOLKZON6 | VA |
| 2015-02-05 | 757-212 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - VA | 7238 | NRFOLKZON6 | VA |
| 2015-01-28 | 412-413 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PTGSBNZN14 | PA |
| 2015-01-27 | 210-951 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SANANTONIO | TX |
| 2015-01-26 | 346-216 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | BAYTOWN | TX |
| 2015-01-26 | 956-609 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | EDINBURG | TX |
| 2015-01-22 | 385-248 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PROVO | UT |
| 2015-01-22 | 435-465 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BRIGHAM CY | UT |
| 2015-01-21 | 208-488 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - ID | 678B | BOISE | ID |
| 2015-01-15 | 816-906 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7594 | KANSASCITY | MO |
| 2015-01-05 | 224-509 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | ALGONQUIN | IL |
| 2015-01-05 | 805-942 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PASOROBLES | CA |
| 2015-01-05 | 805-943 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PASOROBLES | CA |
| 2015-01-02 | 734-685 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7279 | ROMULUS | MI |
| 2014-12-24 | 470-285 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - GA | 7435 | SOCIALCRCL | GA |
| 2014-12-24 | 480-579 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2014-12-23 | 929-368 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | NWYRCYZN05 | NY |
| 2014-12-11 | 385-715 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SALT LAKE | UT |
| 2014-12-11 | 469-681 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DALLAS | TX |
| 2014-12-11 | 469-760 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DALLAS | 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.