Defines the serial number currently associated with the zone. The serial number must be updated every time any change is made to the domain. Note that
sn can take any number in the range of 0 to 4294967295. By convention (but this is only a convention), a date format is used with the form yyyymmddss, where yyyy is the four-digit year number, mm is the month, dd is the day, and ss is the sequence number in case the zone file is updated more than once per day! The value from the example zone file indicates that the last up...
Explanation of the SOA RR
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