The Domain Name System (Dns)
DNS
Alexander Zangerl az@bond.edu.au
Bond University
DNS
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DNS, Domain Name Service is an Internet Service http://www.dns.net/dnsrd/docs/whatis.html is a hierarchical, tree structured naming system maps between domain name space and IP address space distributed Internet directory service mapping stored in global database database distributed and delegated across millions of machines most Internet services rely on DNS to work translates
Domain Name [from] ip address [to]
translates ip address [from] Domain Name [to]
service is provided by
DNS Server
DNS 2 / 28
Domain Name locates an organisation or other entity on the Internet domain names are for human convenience, instead of machine-readable IP-addresses each domain name is made up of a series of character strings (labels) separated by dots: bond.edu.au.
DNS
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FQDN, Fully Qualified Domain Name determines a unique Internet address for any host on the Internet includes hostname and complete domain-name, incl. top-level domain example www.bond.edu.au mri1.tuwien.ac.at
DNS
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Top Level Domain (TLDs) identifies the most general part of the domain name in an Internet address TLD is either a generic top-level domain (gTLD), such as ”com”, or a country code top-level domain (ccTLD), such as ”fr” within every top-level domain there is a list of second-level domains responsibility for operating each TLD is delegated http://www.icann.org/tlds/
DNS
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gTLD, generic TLD best known ones are .org, .com, .net, .edu, .mil, .gov new generic TLDs: .info, . biz, .museum, .... domain names in these TLDs can only be registered through ICANN-accredited registrars
DNS
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ccTLD, country-code TLD
TLDs with two letters (such as .de, .mx, and .jp) – established for over 240 countries and external territories – ISO 3166 can provides regional-specific branding that a typical generic TLD does not comment common misconception is that ccTLDs can only be
Alexander Zangerl az@bond.edu.au
Bond University
DNS
1 / 28
DNS, Domain Name Service is an Internet Service http://www.dns.net/dnsrd/docs/whatis.html is a hierarchical, tree structured naming system maps between domain name space and IP address space distributed Internet directory service mapping stored in global database database distributed and delegated across millions of machines most Internet services rely on DNS to work translates
Domain Name [from] ip address [to]
translates ip address [from] Domain Name [to]
service is provided by
DNS Server
DNS 2 / 28
Domain Name locates an organisation or other entity on the Internet domain names are for human convenience, instead of machine-readable IP-addresses each domain name is made up of a series of character strings (labels) separated by dots: bond.edu.au.
DNS
3 / 28
FQDN, Fully Qualified Domain Name determines a unique Internet address for any host on the Internet includes hostname and complete domain-name, incl. top-level domain example www.bond.edu.au mri1.tuwien.ac.at
DNS
4 / 28
Top Level Domain (TLDs) identifies the most general part of the domain name in an Internet address TLD is either a generic top-level domain (gTLD), such as ”com”, or a country code top-level domain (ccTLD), such as ”fr” within every top-level domain there is a list of second-level domains responsibility for operating each TLD is delegated http://www.icann.org/tlds/
DNS
5 / 28
gTLD, generic TLD best known ones are .org, .com, .net, .edu, .mil, .gov new generic TLDs: .info, . biz, .museum, .... domain names in these TLDs can only be registered through ICANN-accredited registrars
DNS
6 / 28
ccTLD, country-code TLD
TLDs with two letters (such as .de, .mx, and .jp) – established for over 240 countries and external territories – ISO 3166 can provides regional-specific branding that a typical generic TLD does not comment common misconception is that ccTLDs can only be