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 |
|---|---|---|---|---|---|
| 410-403 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | COCKEYSVL | MD | |
| 410-406 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | ESSEX | MD | |
| 410-412 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | GLENBURNIE | MD | |
| 410-413 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | PIKESVILLE | MD | |
| 410-454 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | BALTIMORE | MD | |
| 410-487 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | GLENBURNIE | MD | |
| 410-567 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | ELKRIDGE | MD | |
| 410-587 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ARBUTUS | MD | |
| 410-616 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | TOWSON | MD | |
| 410-630 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | CHASE | MD | |
| 410-645 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | WOODLAWN | MD | |
| 410-650 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DUNDALK | MD | |
| 410-657 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | PARKVILLE | MD | |
| 410-670 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | EDGEWOOD | MD | |
| 410-696 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | ELLICOTTCY | MD | |
| 410-697 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | MILLERSVL | MD | |
| 410-698 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | FORK | MD | |
| 410-701 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | RANDALLSTN | MD | |
| 410-702 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | REISTERSTN | MD | |
| 410-704 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | TOWSON | MD | |
| 410-709 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | SPARROWSPT | MD | |
| 410-753 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | PIKESVILLE | MD | |
| 410-774 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | CROFTON | MD | |
| 410-777 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | SEVERNA PK | MD | |
| 410-786 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | WOODLAWN | MD | |
| 410-801 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | BALTIMORE | MD | |
| 410-842 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | TOWSON | MD | |
| 410-846 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | SEVERN | MD | |
| 410-864 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | BALTIMORE | MD | |
| 410-874 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | ODENTON | MD | |
| 410-878 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | BALTIMORE | MD | |
| 410-881 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | SHERWD FOR | MD | |
| 410-891 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | COCKEYSVL | MD | |
| 410-904 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | WATERLO238 | MD | |
| 410-907 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | WOODLAWN | MD | |
| 410-910 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | COLUMBIA | MD | |
| 410-919 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | ANNAPOLIS | MD | |
| 410-949 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | BALTIMORE | MD | |
| 410-970 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | SYKESVILLE | MD | |
| 412-208 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PTTSBGZON1 | PA | |
| 412-209 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PTTSBGZON1 | PA | |
| 412-254 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PTTSBGZON6 | PA | |
| 412-258 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PTTSBGZON1 | PA | |
| 412-297 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PTTSBGZON1 | PA | |
| 412-312 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PTTSBGZON2 | PA | |
| 412-313 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PTTSBGZON2 | PA | |
| 412-376 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PTGSBNZN22 | PA | |
| 412-385 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PTGSBNZN10 | PA | |
| 412-386 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PTGSBNZN11 | PA | |
| 412-387 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ELIZABETH | PA |
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.