- Perform PTR lookups on all of 198.41.0.4\/30:
- .
- @
- $ echo 198.41.0.4\/30 | hath reversed
- 198.41.0.4: a.root-servers.net.
- 198.41.0.5:
- 198.41.0.6: rs.internic.net.
- 198.41.0.7:
- @
- .
- The DNS lookups are usually the bottleneck for this mode, but we can
- perform them in parallel. Simply pass the number of threads to the
- GHC runtime on the command line; for example, the following will
- perform 25 lookups in parallel:
- .
- @
- $ echo 198.41.0.4\/24 | hath reversed +RTS -N25
- 198.41.0.4: a.root-servers.net.
- 198.41.0.5:
- 198.41.0.6: rs.internic.net.
- ...
- @
- .