Clients provided with BIND 9

 The Berkeley Internet Name Domain (BIND 9) implements an Internet domain
 name server. BIND 9 is the most widely-used name server software on the
 Internet, and is supported by the Internet Software Consortium, www.isc.org.
 .
 This package delivers various client programs related to DNS that are
 derived from the BIND 9 source tree.
 .
  - dig - query the DNS in various ways
  - nslookup - the older way to do it
  - nsupdate - perform dynamic updates (See RFC2136)