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 |
|---|---|---|---|---|---|
| 2018-08-22 | 509-827 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | RICHLAND | WA |
| 2018-08-17 | 949-490 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | IRVINE | CA |
| 2018-07-20 | 470-980 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - GA | 7435 | SENOIA | GA |
| 2018-06-26 | 929-479 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | NWYRCYZN07 | NY |
| 2018-06-25 | 859-788 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LEXINGTON | KY |
| 2018-06-07 | 980-985 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | CHARLOTTE | NC |
| 2018-06-01 | 571-387 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HERNDON | VA |
| 2018-05-25 | 208-804 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LAPWAI | ID |
| 2018-05-15 | 628-263 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNFC CNTRL | CA |
| 2018-05-11 | 480-687 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHOENIX | AZ |
| 2018-05-08 | 848-266 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SEASIDE PK | NJ |
| 2018-05-03 | 848-264 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NEWBRNSWCK | NJ |
| 2018-05-02 | 641-387 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | TOLEDO | IA |
| 2018-04-26 | 209-307 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | STOCKTON | CA |
| 2018-04-26 | 559-319 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | FRESNO | CA |
| 2018-04-26 | 775-437 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NV | 7376 | RENO | NV |
| 2018-04-23 | 332-204 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NWYRCYZN01 | NY |
| 2018-04-16 | 618-418 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | BELLEVILLE | IL |
| 2018-04-11 | 445-737 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - PA | 7434 | PHLDLPHZN4 | PA |
| 2018-04-09 | 718-500 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | NWYRCYZN06 | NY |
| 2018-04-06 | 253-525 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | GIG HARBOR | WA |
| 2018-04-05 | 510-955 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | OKLD TRNID | CA |
| 2018-04-05 | 530-922 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | OROVILLE | CA |
| 2018-03-30 | 831-202 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SALINAS | CA |
| 2018-03-29 | 908-402 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CRANFORD | NJ |
| 2018-03-23 | 315-275 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | UTICA | NY |
| 2018-03-22 | 765-217 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN | 7440 | YORKTOWN | IN |
| 2018-03-21 | 956-359 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MCALLEN | TX |
| 2018-03-19 | 279-399 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SCRM MAIN | CA |
| 2018-03-16 | 914-685 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7650 | YORKTN HTS | NY |
| 2018-03-15 | 209-458 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | MODESTO | CA |
| 2018-03-09 | 256-678 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AL | 7469 | HUNTSVILLE | AL |
| 2018-03-06 | 302-301 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NEWARK | DE |
| 2018-02-22 | 385-337 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MIDVALE | UT |
| 2018-02-22 | 531-335 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WEST POINT | NE |
| 2018-02-21 | 272-214 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - PA | 7434 | CLARKSSMMT | PA |
| 2018-02-15 | 508-206 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NATICK | MA |
| 2018-02-09 | 618-361 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PINCKNEYVL | IL |
| 2018-02-06 | 571-417 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LEESBURG | VA |
| 2018-02-01 | 240-588 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | GRANTSVL | MD |
| 2018-01-30 | 215-201 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHLDLPHZN1 | PA |
| 2018-01-26 | 424-419 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | INGLEWOOD | CA |
| 2018-01-25 | 515-410 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DES MOINES | IA |
| 2018-01-16 | 878-220 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | EXPORT | PA |
| 2018-01-12 | 424-559 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | W ANGELES | CA |
| 2018-01-12 | 445-428 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - PA | 7434 | PHLDLPHZN2 | PA |
| 2018-01-12 | 702-670 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NV | 9145 | LAS VEGAS | NV |
| 2018-01-09 | 952-208 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | TWINCITIES | MN |
| 2018-01-08 | 617-685 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CAMBRIDGE | MA |
| 2018-01-03 | 763-292 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | TWINCITIES | MN |
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.