Shell Programming and Scripting

Sorry, I will make my self creative and let me know if it's right

Good approach. We will check your solutions.

I tried this but it didn't work

sed -r 's#/+55.58.[21][6].[2][14][17]]/+#/domain.com/#g' file

Please use code tags as required by forum rules!

Not too bad. Remove the double closing square bracket at the end, and it will fly. The [6] and [2] aren't necessary, make them 6 and 2.
That regex will also match e.g. 55.58.16.211 or ...217; so if chances are there other, unwanted matches possible und you want exactly and only the two mentioned, other measures need to be taken.
Please be aware that the . in the regex will match any char including dot. If it HAS to be ".", make it \. in the regex.

Code:

sed -r 's#/+55.58.[21]6.2[14][17]/+#/domain.com/#g' file

there is any way to know if the cmd did the right Job, the dump is 15MB

Either use a representative subset of the file, or open the resulting file and do a spot check on those addresses.
Of course, you could grep for the original IP; if they have disappeared, things should be well.