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.
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| Assigned | NPA-NXX | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 301-256 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LAUREL236 | MD | |
| 301-272 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN2 | MD | |
| 301-273 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN3 | MD | |
| 301-276 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN4 | MD | |
| 301-278 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN5 | MD | |
| 301-281 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN6 | MD | |
| 301-284 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNGTNZN10 | MD | |
| 301-287 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNGTNZN11 | MD | |
| 301-288 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNGTNZN12 | MD | |
| 301-289 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNG236Z13 | MD | |
| 301-291 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNG236Z14 | MD | |
| 301-296 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNGTNZN10 | MD | |
| 301-298 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNG236Z15 | MD | |
| 301-337 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | GAITHERSBG | MD | |
| 301-348 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNGTNZN11 | MD | |
| 301-364 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN4 | MD | |
| 301-479 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNG236Z13 | MD | |
| 301-500 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN2 | MD | |
| 301-712 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | FREDERICK | MD | |
| 301-755 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN3 | MD | |
| 301-778 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN5 | MD | |
| 301-795 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNGTNZN10 | MD | |
| 301-804 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ASHTON236 | MD | |
| 301-822 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNGTNZN11 | MD | |
| 301-837 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNG236Z13 | MD | |
| 301-841 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN2 | MD | |
| 301-867 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNG236Z14 | MD | |
| 301-878 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | BALTIMORE | MD | |
| 301-909 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN5 | MD | |
| 301-944 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | GAITHERSBG | MD | |
| 301-945 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNGTNZN11 | MD | |
| 301-955 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN4 | MD | |
| 301-957 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LAUREL236 | MD | |
| 301-960 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN3 | MD | |
| 301-965 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN6 | MD | |
| 301-966 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNGTNZN12 | MD | |
| 301-968 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN2 | MD | |
| 302-258 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | GEORGETOWN | DE | |
| 302-261 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DELAWARECY | DE | |
| 302-269 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DOVER | DE | |
| 302-353 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WILMINGTON | DE | |
| 302-385 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOLLY OAK | DE | |
| 302-397 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WILMINGTON | DE | |
| 302-450 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DOVER | DE | |
| 302-689 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NEW CASTLE | DE | |
| 302-691 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WILMINGTON | DE | |
| 302-729 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOCKESSIN | DE | |
| 302-861 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NEWARK | DE | |
| 302-985 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WILMINGTON | DE | |
| 303-209 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO |
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.