Release Notes: The timeout command line parameter was re-integrated. IPv6 root server handling was fixed. A lame server issue with certain domain names was fixed.
Release Notes: Handling of timeouts was improved: instead of a static value, an initial value of five seconds is used, and is doubled with each retry. Warnings are printed if you receive a different RR type than the one you asked for (for example, when you ask for an A record and receive a CNAME). Problems which occurred when records received in the authority field are shorter than the domain for which the nameserver is authoritative were fixed. When compiled without IPv6 support on an IPv6 capable machine, the machine tried to query the IPv6 translated IPv6 address anyway.
Release Notes: IPv6 servers can now be traced, and a -S option was added for specifying the source IP address.
Release Notes: This release adds support for SOA records.
Release Notes: Added support for PTR records, and fixed some annoyances.