WhoIs lookups for an IPv6-mapped IPv4 address such as
"::ffff:100.87.98.86" failed to match the node's canonical IPv4
address. Unmap the address before looking it up so these resolve.
Fixes#20235
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Signed-off-by: Bouke van der Bijl <i@bou.ke>