they are well known of vs they are well known for

Some examples from the web:

• Personally, I would wish that the hotlines were better known: they are well known in some countries but not in all.
• In fact, the two products have two distinct markets in which they are well known and correctly identified.
• There have, of course, been omissions;I am not going to list them here, they are well known.
• These rules are very stable indeed and they are well known, because it is on the basis of these rules of origin that customs duties are paid when products come into the European market.
• particular attention should be paid to cases where the only available tumour data are the occurrence of neoplasms at sites and in strains where they are well known to occur spontaneously with a high incidence.
• Your victories abroad are well known.
• The three of us are well-known.
• The damaged feelings between you are well-known but old wounds may be healing.
• The denominations of the euro are well known.
• The deficiencies in scientific research are well known.
• Delays in payment are mounting up and the bureaucratic obstacles are well known.
• Cases of kidnapping and even killings of relief workers are well known.
• The benefits of maintaining a low and stable inflation rate are well known.
• All the elements needed are well known and can be found in the Road Map and other documents.
• I think that the current shortcomings are well known.
• The basic principles that must govern all communications interception systems are well known.
• Those masseurs are well known around here.
• These are well-known objectives and we shall continue to work to achieve them.
• The effects of this are well known. They are everywhere.
• Now, chimpanzees are well-known for their aggression.

Some examples from the web:

• Personally, I would wish that the hotlines were better known: they are well known in some countries but not in all.
• In fact, the two products have two distinct markets in which they are well known and correctly identified.
• There have, of course, been omissions;I am not going to list them here, they are well known.
• Now, chimpanzees are well-known for their aggression.
• These rules are very stable indeed and they are well known, because it is on the basis of these rules of origin that customs duties are paid when products come into the European market.
• particular attention should be paid to cases where the only available tumour data are the occurrence of neoplasms at sites and in strains where they are well known to occur spontaneously with a high incidence.
• Lakota shamans are well known for their extended rituals in healing, as well as herbal remedies.
• Lakota shamans are well known for their extended rituals in healing, as well as herbal remedies.
• Traditionally, the city of Göttingen and its surrounding areas are well-known for highly developed expertise and methods with regard to manufacturing meat products.
• Most of today's transformative companies are well known for having an innovative corporate culture and working environment that inspires and empowers employees.
• Your victories abroad are well known.
• In fact, the parameters of the solution are well known, and have been known for some time.
• Mr Moscovici, in his report, is right to press Bucharest for this as well, for the Romanian shops are well-known for being stacked with counterfeit goods.
• The Dutch presidency, and the Dutch in general, are well known for knowing their way about water.
• Given that the British are well known for being a nation of animal lovers, this is an argument that you, too, may be able to use.
• I picked two well-known examples, because they're very well-known for expressing science through art.
• I am well known for my kindness and generosity.
• He became well-known for his annual birthday feats of strength.
• He's well known for his use of colour and texture.
• He isn't well known for his "gratitude".