A ## address record,Returns a 32-bit IPv4 address, most commonly used to
map hostnames to an IP address of the host.
eric.ctechz.com. IN A 32.36.7.6
(address) Maps a host name to an IP address. When a computer has multiple adapter cards or IP addresses, or both, it should have multiple address records.
AAAA ## IPv6 address record, Returns a 128-bit IPv6 address, most commonly used to map hostnames to an IP address of the host.
CNAME ## Canonical name record, Alias of one name to another: the DNS
lookup will continue by retrying the lookup with the new name.
CNAME records simply allow a machine to be known by more than
one hostname. There must always be an A record for the machine
before aliases can be added. The host name of a machine that is
stated in an A record is called the canonical.
www.ctechz. IN CNAME eric.ctechz.com.
(canonical name) Sets an alias for a host name. For example, using this record, zeta.microsoft.com can have an alias as www.microsoft.com.
MX ## mail exchange record, Maps a domain name to a list of message
transfer agents for that domain.
(mail exchange) Specifies a mail exchange server for the domain, which allows mail to be delivered to the correct mail servers in the domain.
NS ## name server record, Delegates a DNS zone to use the given authoritative name servers.
ctechz.com. IN NS ravan.ctechz.com.
(name server) Specifies a name server for the domain, which allows DNS lookups within various zones. Each primary and secondary name server should be declared through this record.
PTR ## pointer record, Pointer to a canonical name. Unlike a CNAME, DNS processing does NOT proceed, just the name is returned. The
most common use is for implementing reverse DNS lookups, but other uses
include such things as DNS-SD.
(pointer) Creates a pointer that maps an IP address to a host name for reverse lookups.
SOA ## start of [a zone of] authority record, Specifies authoritative
information about a DNS zone, including the primary name server, the email of the domain administrator, the domain serial number, and
several timers relating to refreshing the zone.
(start of authority) Declares the host that's the most authoritative for the zone and, as such, is the best source of DNS information for the zone. Each zone file must have an SOA record (which is created automatically when you add a zone).
ctechz.com. IN SOA dom.ctechz.com.
hostmaster.ctechz.com. (
1996111901 ; Serial
10800 ; Refresh
3600 ; Retry
3600000 ; Expire
86400 ) ; Minimum
TXT ## Text record, Originally for arbitrary human-readable text in a DNS
record.
The @ symbol in your DNS record refers to the record for your domain name without any www or sub-domain name.
The result of this record is that visitors can connect to your domain name at http://your-domain.com. You may also notice the @ symbol in the CNAME section:
ftp @
www @
This will create aliases to the @ A Record, which will point www.your-domain.com and ftp.your-domain.com to the same IP address.
The @ symbol may also be used in an MX record. For example:
@ mail 1
This indicates that the primary MX record for the email sent to @your-domain.com points to the A-record called "mail".
map hostnames to an IP address of the host.
eric.ctechz.com. IN A 32.36.7.6
(address) Maps a host name to an IP address. When a computer has multiple adapter cards or IP addresses, or both, it should have multiple address records.
AAAA ## IPv6 address record, Returns a 128-bit IPv6 address, most commonly used to map hostnames to an IP address of the host.
CNAME ## Canonical name record, Alias of one name to another: the DNS
lookup will continue by retrying the lookup with the new name.
CNAME records simply allow a machine to be known by more than
one hostname. There must always be an A record for the machine
before aliases can be added. The host name of a machine that is
stated in an A record is called the canonical.
www.ctechz. IN CNAME eric.ctechz.com.
(canonical name) Sets an alias for a host name. For example, using this record, zeta.microsoft.com can have an alias as www.microsoft.com.
MX ## mail exchange record, Maps a domain name to a list of message
transfer agents for that domain.
(mail exchange) Specifies a mail exchange server for the domain, which allows mail to be delivered to the correct mail servers in the domain.
NS ## name server record, Delegates a DNS zone to use the given authoritative name servers.
ctechz.com. IN NS ravan.ctechz.com.
(name server) Specifies a name server for the domain, which allows DNS lookups within various zones. Each primary and secondary name server should be declared through this record.
PTR ## pointer record, Pointer to a canonical name. Unlike a CNAME, DNS processing does NOT proceed, just the name is returned. The
most common use is for implementing reverse DNS lookups, but other uses
include such things as DNS-SD.
(pointer) Creates a pointer that maps an IP address to a host name for reverse lookups.
SOA ## start of [a zone of] authority record, Specifies authoritative
information about a DNS zone, including the primary name server, the email of the domain administrator, the domain serial number, and
several timers relating to refreshing the zone.
(start of authority) Declares the host that's the most authoritative for the zone and, as such, is the best source of DNS information for the zone. Each zone file must have an SOA record (which is created automatically when you add a zone).
ctechz.com. IN SOA dom.ctechz.com.
hostmaster.ctechz.com. (
1996111901 ; Serial
10800 ; Refresh
3600 ; Retry
3600000 ; Expire
86400 ) ; Minimum
TXT ## Text record, Originally for arbitrary human-readable text in a DNS
record.
The @ symbol in your DNS record refers to the record for your domain name without any www or sub-domain name.
The result of this record is that visitors can connect to your domain name at http://your-domain.com. You may also notice the @ symbol in the CNAME section:
ftp @
www @
This will create aliases to the @ A Record, which will point www.your-domain.com and ftp.your-domain.com to the same IP address.
The @ symbol may also be used in an MX record. For example:
@ mail 1
This indicates that the primary MX record for the email sent to @your-domain.com points to the A-record called "mail".
Great short explanation on DNS records. I also found www.unlocktheinbox.com to be pretty helpful and informative as well. I love the wizards they have for creating the DNS records, make it easy. ;)
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