Open Server and SDK support IPv6 on all the platforms on which these products are released. Below is an interfaces file entry where the last two server addresses specified are in IPv6 format:
BARNARD_OS master tcp ether barnards.sybase.com 18200 query tcp ether barnards.sybase.com 18200 master tcp ether barnards.v6.sybase.com 18200 query tcp ether barnards.v6.sybase.com 18200 master tcp ether fd77:55d:59d9:165:203:baff:fe68:aa12 18200 query tcp ether fd77:55d:59d9:165:203:baff:fe68:aa12 18200
