Thanks Rainer,
According to Google, it is Koln.
When people reading Koln.cc they would without a doubt refer directly that it is köln.
If we check google for köln we get:
Results 1 - 10 of about 106,000,000 for köln
If we check google for koeln we get
Results 1 - 10 of about 108,000,000 for koeln
And when we check google for Koln we get:
Results 1 - 10 of about 112,000,000 for Koln
Anyways, I would really appreciate more opinions.
Thanks,
Rami