From 1994 the German Post office introduced codes for mail centres with each having its own unique number within the hand stamp to cancel mail. The Briefzentren codes were used where a town cancellation was not or could not be used. In most cases the hand stamp only has the Briefzentren code and not the mail centre location.
Below is a list of all 100 briefzentren (mail centre) codes with cancellation size and first use date. Fine complete cancellations exist on commemorative issues and commercial covers from 1994 onwards and it is possible to put together a specialised collection of these hand stamps fairly easily.