In a DNS Zone file, what does the @ mean? | Islandnet Blog
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In a DNS Zone file, what does the @ mean?

In a DNS zone file, the @ symbol is replaced with the $ORIGIN of the zone when the zone is parsed by BIND (or whatever DNS software you're using.

E.G.,
example.com IN SOA ns1.example.com. hostmaster.example.com.
2011051901 ; Serial
10800 ; Refresh after 3 hours
3600 ; Retry after 1 hour
604800 ; Expire after 1 week
1200 ) ; Minimum TTL of 2 hours
@ IN A 192.168.1.1
www IN A 192.168.1.2
mail IN A 192.168.1.3
@ IN MX 5 mail.example.com.

in this example, anywhere you see the @ symbol, replace with the $ORIGIN of the zone. In this case, example.com.