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2. List of DNS record types - Wikipedia

   en.wikipedia.org/wiki/List_of_DNS_record_types

   Address record. Returns a 32-bit IPv4 address, most commonly used to map hostnames to an IP address of the host, but it is also used for DNSBLs, storing subnet masks in RFC 1101, etc. AAAA. 28. RFC 3596 [2] IPv6 address record. Returns a 128-bit IPv6 address, most commonly used to map hostnames to an IP address of the host.

3. 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.

4. Domain Name System - Wikipedia

   en.wikipedia.org/wiki/Domain_Name_System

   For example, in the following configuration, the DNS zone x.example specifies that all subdomains, including subdomains of subdomains, of x.example use the mail exchanger (MX) a.x.example. The A record for a.x.example is needed to specify the mail exchanger IP address. As this has the result of excluding this domain name and its subdomains from ...

5. Wildcard DNS record - Wikipedia

   en.wikipedia.org/wiki/Wildcard_DNS_record

   Wildcard DNS record. A wildcard DNS record is a record in a DNS zone that will match requests for non-existent domain names. A wildcard DNS record is specified by using a * as the leftmost label (part) of a domain name, e.g. *.example.com. The exact rules for when a wildcard will match are specified in RFC 1034, but the rules are neither ...

6. TXT record - Wikipedia

   en.wikipedia.org/wiki/TXT_record

   The DNS protocol specifies that when a client queries for a specific record type (e.g., TXT) for a certain domain name (e.g., example.com), all records of that type must be returned in the same DNS message. That may lead to large transactions with lots of "unnecessary" information being transferred and/or uncertainty about which TXT record to use.

7. 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. Classless reverse DNS method

8. SRV record - Wikipedia

   en.wikipedia.org/wiki/SRV_record

   A Service record ( SRV record) is a specification of data in the Domain Name System defining the location, i.e., the hostname and port number, of servers for specified services. It is defined in RFC 2782, and its type code is 33. Some Internet protocols such as the Session Initiation Protocol (SIP) and the Extensible Messaging and Presence ...

9. Domain Name System Security Extensions - Wikipedia

   en.wikipedia.org/wiki/Domain_Name_System...

   Ideally, the security-aware resolver would start with verifying the DS and DNSKEY records at the DNS root. Then it would use the DS records for the "com" top-level domain found at the root to verify the DNSKEY records in the "com" zone. From there, it would see if there is a DS record for the "example.com" subdomain in the "com" zone, and if ...