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Dynamic DNS (DDNS) is a method of automatically updating a name server in the Domain Name System (DNS), often in real time, with the active DDNS configuration of its configured hostnames, addresses or other information.
DNAME: 39 RFC 6672 Delegation name record: Alias for a name and all its subnames, unlike CNAME, which is an alias for only the exact name. Like a CNAME record, the DNS lookup will continue by retrying the lookup with the new name.
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Domain name resolvers determine the domain name servers responsible for the domain name in question by a sequence of queries starting with the right-most (top-level) domain label. A DNS resolver that implements the iterative approach mandated by RFC 1034; in this case, the resolver consults three name servers to resolve the fully qualified ...
Free Yes Public domain: Dnsmasq: Simon Kelley Free Yes GPL: Simple DNS Plus: JH Software $79 – $379 No Clickwrap license: NSD: NLnet Labs Free Yes BSD variant Knot DNS: CZ.NIC: Free Yes GPL: Knot Resolver: CZ.NIC: Free Yes GPL: PowerDNS: PowerDNS.COM BV / Bert Hubert Free Yes GPL: MaraDNS: Sam Trenholme Free Yes BSD variant pdnsd: Thomas ...
Caching name servers are often also recursive name servers—they perform every step necessary to answer any DNS query they receive. To do this the name server queries each authoritative name-server in turn, starting from the DNS root zone. It continues until it reaches the authoritative server for the zone that contains the queried domain name.
There are 13 logical root name servers specified, with logical names in the form letter.root-servers.net, where letter ranges from a to m. The choice of thirteen name servers was made because of limitations in the original DNS specification, which specifies a maximum packet size of 512 bytes when using the User Datagram Protocol (UDP). [7]
Knot DNS is an open-source authoritative-only server for the Domain Name System.It was created from scratch and is actively developed by CZ.NIC, the .CZ domain registry. The purpose of this project is to supply an alternative open-source implementation of an authoritative DNS server suitable for TLD operators to increase overall security, stability and resiliency of the Domain Name System.