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+# xtr
+
+This is the server for the XTR (XiCoN Trace Route). It's more of a master browser for the clients, so an web frontend can get a list of all the available clients combined from one auto-updated source. It opens a port and listening to HTTP requests (GET and PUT). It can list all online and offline clients. It also accepts new client entries via a PUT request (target client address in database has to be the request ip).
+
+The server keeps the list of clients up2date with checking their availablity with each request of all online clients.
+
+This software uses the iptoasn database (https://iptoasn.com/) to determine the AS for each client. To keep track of all ip to asn relations, this software creates a local database file "ip2asn.db", which is a simple SQLite3 database with an index for faster searches.
+
+For now, only IPv4 clients are supported. This will change in the future.
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