Searching for '188.8.131.52' gives two results, none of them being EC 184.108.40.206.
Logged In: YES
This is due to a weird error in the database: there are no rows corresponding to that enzyme in the table used for text search (?!).
Running the script which generates the table for every release works fine, without errors, and EC 220.127.116.11 appears in the database again.
This will be fixed in the next IntEnz release, next week.