IP address regexes for filtering spam:

125\.24\..*
125\.24\.186\.61
125\.24\.241\.133
125\.25\.217\.101
68\.68\.42\.85
76\.1\.151\.38
85\.241\.161\.246
85\.241\.191\.155
98\.163\.17\.73
101\.51\.248.*
124.6.181.161

see  http://trac.edgewall.org/browser/plugins/0.12/spam-filter-captcha/tracspamfilter/filters/ip_regex.py