- City / exchange
- Mehlville
- Province / state
- Missouri
- Country
- United States
- Carrier
- Onvoy, LLC - Mo
- Line type
- Likely VoIP / virtual number
- OCN
- 093F
- Status
- In Service
- Assigned
- 05/29/2026
- Number pooling
- Yes (block shared between carriers)
557-256 phone numbers
Mehlville, Missouri, United States · Onvoy, LLC - Mo
Reported numbers in 557-256
No numbers in this block have been reported by visitors yet.
What does the 557-256 prefix tell you?
Every North American number is area code + prefix + line. The prefix 557-256 was assigned to Onvoy, LLC - Mo on 05/29/2026 for the Mehlville exchange. A call from this block usually originates from a Onvoy, LLC - Mo customer in or near Mehlville, but caller ID can be spoofed to show any number.