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DNS service providers often deploy different types of DNS servers in their networks. In addition, different answers may be provided to DNS clients based on the clients' geographic location, as determined by their IP address ().
A WHOIS database consists of a set of text records for each resource. These text records consists of various items of information about the resource itself, and any associated information of assignees, registrants, administrative information, such as creation and expiration dates. Two data models exist for storing resource information in a ...
For a while a new record type (SPF, type 99) was registered and made available in common DNS software. Use of TXT records for SPF was intended as a transitional mechanism at the time. The experimental RFC, RFC 4408, section 3.1.1, suggested "an SPF-compliant domain name SHOULD have SPF records of both RR types". [14]
DMARC operates by checking that the domain in the message's From: field (also called "RFC5322.From" [2]) is "aligned" with other authenticated domain names.If either SPF (specified using the aspf field) or DKIM (specified using the adkim) alignment checks pass, then the DMARC alignment test passes.
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Email authentication, or validation, is a collection of techniques aimed at providing verifiable information about the origin of email messages by validating the domain ownership of any message transfer agents (MTA) who participated in transferring and possibly modifying a message.
The DNS is a hierarchical naming system for computers, services, or any resource participating in the Internet. The top of that hierarchy is the root domain . The root domain does not have a formal name and its label in the DNS hierarchy is an empty string .
A fast-flux service network (FFSN) is a network infrastructure resultant of the fast-fluxed network of compromised hosts; the technique is also used by legitimate service providers such as content distribution networks (CDNs) where the dynamic IP address is converted to match the domain name of the internet host, usually for the purpose of load balancing using round-robin domain name system ...