dothost is a DNS lookup utility, which produces output in Graphviz
format. It does this, not by using Graphviz, but by using the graph-easy
Perl module also available at slackbuilds.org

Example:

dothost www.iana.org | graph-easy --as ascii

       +-------------------------+
       v                         |
     #####################     +------------+
  +> #   www.iana.org    # --> | 192.0.32.8 |
  |  #####################     +------------+
  |    |
  |    |
  |    v
  |  +-------------------+
  +- | 2620:0:2d0:200::8 |
     +-------------------+