This will allow you generate a filter list based on live registry data.

You can also use a regular 'whois' client against filtergen.dan.me.uk to get the same output.
For example, on a UNIX-based operating system such as FreeBSD:

whois -h filtergen.dan.me.uk -- "-6 -RIPE -t cisco -f example -upto 48 AS57672

Note: to remove comments, append " | grep -v ^%" to the command.