Prefix 305-422 — Keys, FL

NANPA CO code assignment, current as of July 28, 2026.

Area code
305
Prefix (NXX)
422
Rate center
Keys
State
Florida
Time zone
Eastern
Code holder
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL
OCN
8664
Pooled
Yes (thousands-block pooling)
Assigned
2003-09-05
LATA
460

Numbers in the 305-422 prefix are registered to the Keys rate center in FL, inside area code 305. The prefix is the second block of a ten-digit US number (305-422-XXXX) and pins the number to a billing locality.

The assigned code holder is MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL, operating company number 8664, assigned September 5, 2003. This is a pooled prefix — expect numbers within it to be split across more than one carrier in 1,000-number blocks.

The rate center lies in the Miami-Fort Lauderdale-Pompano-West Palm Beach, FL Metropolitan Statistical Area. The serving LATA is 460. Local time follows the Eastern zone.

Spoofing means this prefix on your screen doesn't guarantee a Keys caller. Verify independently before trusting a request for money or data.

Neighboring prefixes

Prefixes adjacent to 305-422
PrefixRate centerCode holder
305-419 Keys ONVOY, LLC - FL
305-420 Miami TELEPORT COMMUNICATIONS AMERICA, LLC - FL
305-421 Miami TELEPORT COMMUNICATIONS AMERICA, LLC - FL
305-423 Miami MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL
305-424 Miami BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL
305-425 Keys MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL

FAQ

Where is 305-422 located?

The prefix is assigned to the Keys rate center in FL, area code 305. It is part of the Miami-Fort Lauderdale-Pompano-West Palm Beach, FL Metropolitan Statistical Area.

Which company owns 305-422 numbers?

MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL holds the code, but the prefix is pooled — individual thousands-blocks can be assigned to other carriers, and numbers may be ported to any provider.

Is a call from 305-422 safe to answer?

The prefix itself says nothing about the caller. Legitimate Keys businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.