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 |
|---|---|---|---|---|---|
| 303-214 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-217 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-218 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-219 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-222 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-242 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-302 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-305 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-323 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-328 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-334 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-357 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-390 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-476 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-481 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-495 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-531 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-539 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-542 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-551 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-566 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-704 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-729 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-785 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-801 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-876 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-928 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-968 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 303-991 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO | |
| 304-380 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHRLSTNZN1 | WV | |
| 304-381 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MORGANTOWN | WV | |
| 305-307 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | KEYS | FL | |
| 305-328 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | PERRINE | FL | |
| 305-351 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | MIAMI | FL | |
| 305-356 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | NORTH DADE | FL | |
| 305-357 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MIAMI | FL | |
| 305-359 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | KEYS | FL | |
| 305-384 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | NORTH DADE | FL | |
| 305-390 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | KEYS | FL | |
| 305-396 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | KEYS | FL | |
| 305-423 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | MIAMI | FL | |
| 305-506 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | PERRINE | FL | |
| 305-507 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | MIAMI | FL | |
| 305-508 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | HOMESTEAD | FL | |
| 305-521 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | NORTH DADE | FL | |
| 305-647 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | KEYS | FL | |
| 305-675 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | MIAMI | FL | |
| 305-702 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | MIAMI | FL | |
| 305-704 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | MIAMI | FL | |
| 305-714 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | MIAMI | FL |
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.