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 |
|---|---|---|---|---|---|
| 2005-01-31 | 203-990 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | OLDGRNWICH | CT |
| 2005-01-26 | 810-344 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7279 | GRANDBLANC | MI |
| 2005-01-25 | 330-520 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | MARSHALLVL | OH |
| 2005-01-20 | 352-608 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | TRILACOCHE | FL |
| 2005-01-10 | 256-676 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AL | 7469 | ANNISTON | AL |
| 2005-01-10 | 256-680 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AL | 7469 | GADSDEN | AL |
| 2005-01-07 | 703-956 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HERNDON | VA |
| 2004-12-27 | 850-427 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MONTICELLO | FL |
| 2004-12-22 | 801-653 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LEHI | UT |
| 2004-12-01 | 252-764 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | SWNSBRWCAR | NC |
| 2004-12-01 | 330-642 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | ORRVILLE | OH |
| 2004-11-16 | 276-210 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | RICHLANDS | VA |
| 2004-11-01 | 443-446 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | QUEENSTOWN | MD |
| 2004-10-19 | 678-928 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | GAINESVL | GA |
| 2004-10-18 | 352-310 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | OCKLAWAHA | FL |
| 2004-10-13 | 352-289 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | FOREST | FL |
| 2004-10-11 | 630-405 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | AURORA | IL |
| 2004-10-04 | 540-209 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - VA | 7238 | HARRISONBG | VA |
| 2004-09-30 | 662-857 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | SARDIS | MS |
| 2004-09-28 | 229-352 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - GA | 7435 | ALBANY | GA |
| 2004-09-28 | 706-715 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ATHENS | GA |
| 2004-09-23 | 870-629 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | W MEMPHIS | AR |
| 2004-09-22 | 910-887 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | LUMBERTON | NC |
| 2004-09-16 | 567-855 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7158 | CLYDE | OH |
| 2004-09-14 | 203-636 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | DARIEN | CT |
| 2004-09-08 | 330-302 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | LODI | OH |
| 2004-09-08 | 330-331 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | WADSWORTH | OH |
| 2004-09-01 | 808-206 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HONOLULU | HI |
| 2004-09-01 | 808-212 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LIHUE | HI |
| 2004-09-01 | 808-213 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | KAUNAKAKAI | HI |
| 2004-09-01 | 808-214 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WAILUKU | HI |
| 2004-09-01 | 808-215 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LANAI CITY | HI |
| 2004-09-01 | 808-217 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HILO | HI |
| 2004-08-31 | 256-665 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AL | 7469 | HUNTSVILLE | AL |
| 2004-08-31 | 910-778 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | FAYETTEVL | NC |
| 2004-08-30 | 740-954 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | ASHVILLE | OH |
| 2004-08-30 | 843-401 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - SC | 8534 | KINGSTREE | SC |
| 2004-08-24 | 910-535 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | FAIRMONT | NC |
| 2004-08-24 | 919-766 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC | 7835 | FREMONT | NC |
| 2004-08-19 | 607-207 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7650 | ELMIRA | NY |
| 2004-08-19 | 845-674 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7650 | NEWBURGH | NY |
| 2004-08-18 | 510-948 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HRCUL-RODE | CA |
| 2004-08-17 | 419-632 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | MANSFIELD | OH |
| 2004-08-16 | 203-844 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | FAIRFIELD | CT |
| 2004-08-16 | 802-922 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BURLINGTON | VT |
| 2004-08-11 | 434-200 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LYNCHBURG | VA |
| 2004-08-11 | 804-205 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - VA | 7238 | RICHMOND | VA |
| 2004-08-06 | 609-833 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PLEASANTVL | NJ |
| 2004-07-29 | 540-204 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ROANOKE | VA |
| 2004-07-29 | 608-407 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DODGEVILLE | WI |
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.