The original Bullen/Bärenbeisser and Brabanter have long been extinct, even if attempts have been done in Europe and America to recreate this Central European Dogge.
The Brabanter Bullenbeisser (Brabantse Bullenbijter) was the smallest breed of these dogs, the Bullenbeisser (Ox/bull biter) the medium sized, and the Bärenbeisser (Bear biter) and Danziger Bullenbeisser was the largest of the Bullenbeisser types. The Danziger Bullenbisser was even called Danziger Bärenbeisser.
The Bullenbeisser was brought by Hanseatic traders to their "offices", and these dogs were the ancestors to the dogs used by the Hanseatic traders as watchdogs in their quarters in such towns as Bergen in Norway and Novgorod in Russia.
The Bullenbeisser was also brought by settlers to South Africa, and we can find them in the breed base of the Boerboel and the Rhodesian Ridgeback.
We can also find the Bullenbeisser as one of the ancestors of the Boxer and the Great Dane, and it would surprise me a lot if the Bullenbeisser did not have any influence at all on the Danish Mastiff; the Broholmer, of course, this would have to been before Mr. Sehested's breeding program to preserve the old Broholmer.