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In computer networks, a reverse DNS lookup or reverse DNS resolution (rDNS) is the querying technique of the Domain Name System (DNS) to determine the domain name associated with an IP address – the reverse of the usual "forward" DNS lookup of an IP address from a domain name. [1]
Server Name Indication (SNI) is an extension to the Transport Layer Security (TLS) computer networking protocol by which a client indicates which hostname it is attempting to connect to at the start of the handshaking process. [1]
So, for example, both en.wikipedia.org and wikipedia.org are hostnames because they both have IP addresses assigned to them. A hostname may be a domain name if it is properly organized into the domain name system. A domain name may be a hostname if it has been assigned to an Internet host and associated with the host's IP address. [3]
That is, if there is a wildcard MX for *.example.com, and an A record (but no MX record) for www.example.com, the correct response (as per RFC 1034) to an MX request for www.example.com is "no error, but no data"; this is in contrast to the possibly expected response of the MX record attached to *.example.com.
A VIP address can be used to provide nearly unlimited mobility. For example, if an application has an IP address on a physical subnet, that application can be moved only to a host on that same subnet. VIP addresses can be advertised on their own subnet, [a] so its application can be moved anywhere on the reachable network without changing ...
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.
To manage and recover your account if you forget your password or username, make sure you have access to the recovery phone number or alternate email address you've added to your AOL account. If you know your username but need to reset your password, make sure you create a strong password after you're back in your account.
RFC 6762 was authored by Apple Inc. employees Stuart Cheshire and Marc Krochmal, and Apple's Bonjour zeroconf networking software implements mDNS. [3] That service will automatically resolve the private IP addresses of link-local Macintosh computers running macOS and mobile devices running iOS if .local is appended to their hostnames.