5.1. Programming and DNS — Network Programming Study Guide v1.0. Domain Name System (DNS) DNS is a system of hierarchical, distributed, cached databases used with the TCP/IP Internet to determine and IP address from a given host name and also provide the reverse look-up. Authoritative servers provide this information for each domain and sub-domain. You may be familiar with how to use nslookup or host commands to translate between host name and IP addresses. In DNS tables, the listings of IP address for specific machine names are call A records.
C:\Documents and Settings\tim>nslookup www.ksu.edu Server: ns.sal.ksu.edu Address: 129.130.176.1 Non-authoritative answer: Name: www.ksu.edu Address: 129.130.8.49 We can also use DNS to find a list of servers to use for sending an e-mail message to someone at a particular domain name. In most cases, it is not required that you write code that interacts directly with the DNS system. The two most common Python DNS modules are pyDNS and dnspython. Dnspython provides both high and low level access to DNS. All the Free Software Books you will ever want.
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