Notice the format
'Proto' 'Local Address' 'Foreign Address' 'State'
'TCP' 'server:4838 'dialup-67.75.152.22.Dial1.Atlanta1.Level3.net:1214' 'FIN_WAIT_1'
Interesting that the machine you run netstat on is logged on as (named) "server".
What this says is 'dialup-67-etc' connected to 'server' (your machine) on port:4838.
State FIN_WAIT_1 indicates that the dialup client initiated a disconnect however the
server application on your machine has yet to acknowledge the disconnect.
Not much else to be said without knowing what software on your machine was listening
on that port.