in reply to How do I extract the number of times a value appears in a hash?

Assuming that "IPaddr:Size" are the values: 
map {if /^(.*):(\d*)$/ {$count{$1}++;$size{$1}+=$2;}} values(%hash);

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This will place results in the %count and %size hashes, keyed by IP address. If "IPaddr:Size" are the keys, just replace the 'values' with 'keys' in the fragment above.
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