Exchange · Madison, WI
(608) 257-xxxx
Every number from 608-257-0000 to 608-257-9999. NANPA records the exchange as assigned to AT&T for Madison, WI. Robocall and scam operations often use many numbers from one exchange, so if one number here is a shady call, its neighbors deserve a second look.
Reported numbers starting 608-257
About the 608-257 exchange
608-257 is an exchange (the first six digits of a phone number) in area code 608, which covers Wisconsin. NANPA, which runs the North American Numbering Plan, assigned it to AT&T for the Madison, WI rate center. Numbers from this carrier are usually landline lines.
People keep their number when they move or switch carrier, so this is where the number was first assigned, not where the caller is today. Local time for 608-257 numbers is usually Central time. Scammers can also fake (spoof) any number, so a call that shows a 608-257 number may not come from AT&T at all.