LlamaLabs

First, see what’s in the cache:

$ dscacheutil -cachedump
DirectoryService Cache Overview:
AAAA Queries  - Disabled (link-local IPv6 addresses)
Buckets Used  - 31
Cache Size    - 16

Entry count by category:
Group  - 2
Host   - 11
User   - 3

Flush:

$ dscacheutil -flushcache
$

All gone:

$ dscacheutil -cachedump
DirectoryService Cache Overview:
AAAA Queries  - Disabled (link-local IPv6 addresses)
Buckets Used  - 0
Cache Size    - 0

Entry count by category:

Please see the previous post to see how to clear the DNS cache on OS X Tiger http://llamalabs.com/2007/04/18/how-to-flush-your-dns-cache-on-os-x/