DNS

• mDNS (Multicast DNS)

  The multicast DNS (mDNS) protocol resolves hostnames to IP addresses within small networks that do not include a local name server. It is a zero-configuration service, using essentially the same programming interfaces, packet formats and operating semantics as unicast Domain Name System (DNS). It was designed to work as either a stand-alone protocol or compatible with standard DNS servers. It uses IP multicast User Datagram Protocol (UDP) packets.

Resources

• Why do domain names sometimes end with a dot?
• Why is DNS still hard to learn?
• Implement DNS in a weekend
• The Top of the DNS Hierarchy