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 |
|---|---|---|---|---|---|
| 2003-08-20 | 352-327 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | GAINESVL | FL |
| 2003-08-20 | 850-254 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | TALLAHASSE | FL |
| 2003-08-20 | 850-571 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LYNN HAVEN | FL |
| 2003-08-20 | 850-602 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PENSACOLA | FL |
| 2003-08-18 | 843-773 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - SC | 8534 | FLORENCE | SC |
| 2003-08-13 | 520-203 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | TUCSON | AZ |
| 2003-08-13 | 719-325 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | COLORDOSPG | CO |
| 2003-08-13 | 804-237 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - VA | 7238 | RICHMOND | VA |
| 2003-08-13 | 828-333 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | ASHEVILLE | NC |
| 2003-08-13 | 904-229 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | JACKSONVL | FL |
| 2003-08-13 | 910-632 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WILMINGTON | NC |
| 2003-08-12 | 330-397 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | YOUNGSTOWN | OH |
| 2003-08-07 | 412-592 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PTTSBGZON1 | PA |
| 2003-08-06 | 843-303 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - SC | 288B | CHARLESTON | SC |
| 2003-08-06 | 864-607 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - SC | 8534 | GREENVILLE | SC |
| 2003-07-30 | 309-550 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | PEORIA | IL |
| 2003-07-29 | 251-243 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MOBILE | AL |
| 2003-07-28 | 386-233 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DAYTONABCH | FL |
| 2003-07-24 | 325-340 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7249 | SAN ANGELO | TX |
| 2003-07-24 | 979-599 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7249 | BRYAN | TX |
| 2003-07-23 | 903-353 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LONGVIEW | TX |
| 2003-07-23 | 956-264 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HARLINGEN | TX |
| 2003-07-22 | 361-249 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | C CHRISTI | TX |
| 2003-07-17 | 530-961 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | CHICO | CA |
| 2003-07-17 | 760-992 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | PALM SPG | CA |
| 2003-07-17 | 805-979 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SANBARBARA | CA |
| 2003-07-17 | 831-998 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SALINAS | CA |
| 2003-07-16 | 209-922 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | STOCKTON | CA |
| 2003-07-16 | 509-885 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | WENATCHEE | WA |
| 2003-07-15 | 608-669 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MADISON | WI |
| 2003-07-15 | 812-774 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN | 7440 | EVANSVILLE | IN |
| 2003-07-15 | 812-778 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN | 7440 | BLOOMINGTN | IN |
| 2003-07-15 | 920-593 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | GREEN BAY | WI |
| 2003-07-11 | 906-464 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7279 | ISHPEMING | MI |
| 2003-07-11 | 989-484 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7279 | SAGINAW | MI |
| 2003-07-09 | 336-638 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | GREENSBORO | NC |
| 2003-07-09 | 423-535 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | CHATTNOOGA | TN |
| 2003-07-09 | 912-344 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - GA | 7435 | SAVANNAH | GA |
| 2003-07-03 | 803-873 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - SC | 8534 | COLUMBIA | SC |
| 2003-07-02 | 541-435 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | COOS BAY | OR |
| 2003-07-02 | 763-657 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | TWINCITIES | MN |
| 2003-06-27 | 337-366 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA | 8764 | LAFAYETTE | LA |
| 2003-06-25 | 217-402 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | CHAMPAURBN | IL |
| 2003-06-25 | 217-801 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | SPRINGFLD | IL |
| 2003-06-25 | 815-977 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | ROCKFORD | IL |
| 2003-06-16 | 361-246 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | KINGSVILLE | TX |
| 2003-04-21 | 951-892 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | RIVERSIDE | CA |
| 2003-04-16 | 203-277 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | OLDGRNWICH | CT |
| 2003-04-16 | 203-310 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | NEW CANAAN | CT |
| 2003-04-16 | 203-320 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | DARIEN | CT |
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.