Prefix Information
The prefix 400 is part of area code 865 serving Knoxville, Tennessee.
This exchange contains 10,000 possible phone numbers (865-400-0000 through 865-400-9999).
Phone numbers with prefix 400 in area code 865. Location: Knoxville, Tennessee.
The prefix 400 is part of area code 865 serving Knoxville, Tennessee.
This exchange contains 10,000 possible phone numbers (865-400-0000 through 865-400-9999).