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  2. MX record - Wikipedia

    en.wikipedia.org/wiki/MX_record

    The characteristic payload information of an MX record [1] is a preference value (above labelled "Priority"), and the domain name of a mailserver ("Host" above).. The priority field identifies which mailserver should be preferred - in this case the values are both 10, so mail would be expected to flow evenly to both onemail.example.com and twomail.example.com - a common configuration.

  3. List of DNS record types - Wikipedia

    en.wikipedia.org/wiki/List_of_DNS_record_types

    Returns all records of all types known to the name server. If the name server does not have any information on the name, the request will be forwarded on. The records returned may not be complete. For example, if there is both an A and an MX for a name, but the name server has only the A record cached, only the A record will be returned.

  4. Wildcard DNS record - Wikipedia

    en.wikipedia.org/wiki/Wildcard_DNS_record

    So, a lookup for the MX record for somerandomname.example.com would return an MX record pointing to host1.example.com. Wildcards in the DNS are much more limited than other wildcard characters used in other computer systems. Wildcard DNS records have a single * (asterisk) as the leftmost DNS label, such as *.example.com.

  5. Domain Name System - Wikipedia

    en.wikipedia.org/wiki/Domain_Name_System

    It indicates the format of the data and it gives a hint of its intended use. For example, the A record is used to translate from a domain name to an IPv4 address, the NS record lists which name servers can answer lookups on a DNS zone, and the MX record specifies the mail server used to handle mail for a domain specified in an e-mail address.

  6. Reverse DNS lookup - Wikipedia

    en.wikipedia.org/wiki/Reverse_DNS_lookup

    For example, to do a reverse lookup of the IP address 8.8.4.4 the PTR record for the domain name 4.4.8.8.in-addr.arpa would be looked up, and found to point to dns.google. If the A record for dns.google in turn pointed back to 8.8.4.4 then it would be said to be forward-confirmed.

  7. dig (command) - Wikipedia

    en.wikipedia.org/wiki/Dig_(command)

    dig is a network administration command-line tool for querying the Domain Name System (DNS).. dig is useful for network troubleshooting and for educational purposes. [2] It can operate based on command line option and flag arguments, or in batch mode by reading requests from an operating system file.

  8. CNAME record - Wikipedia

    en.wikipedia.org/wiki/CNAME_record

    A Canonical Name (CNAME) record is a type of resource record in the Domain Name System (DNS) that maps one domain name (an alias) to another (the canonical name). [1]This can prove convenient when running multiple services (like an FTP server and a web server, each running on different ports) from a single IP address.

  9. Sender Policy Framework - Wikipedia

    en.wikipedia.org/wiki/Sender_Policy_Framework

    A typical SPF HELO policy v=spf1 a mx ip4:192.0.2.0 -all may execute four or more DNS queries: (1) TXT record (SPF type was obsoleted by RFC 7208), (2) A or AAAA for mechanism a, (3) MX record and (4+) A or AAAA for each MX name, for mechanism mx. Except the first one, all those queries count towards the limit of 10.