Using IPv6 applications

Typical users specify "host name" to applications
(e.g) ftp ftp.mew.org

Users are not aware which they are using, IPv4 or IPv6
(e.g) "ftp ftp.mew.org" may use IPv4
(e.g) "ftp ftp.mew.org" may use IPv6

Users can specify an IPv6 address to applications, of course
(e.g) ftp 3ffe:501:8:1234:260:97ff:fe40:efab
(e.g) telnet ::1

But ":" is unfriendly to some application syntax
URL
http://[3ffe:501:8:1234:260:97ff:fe40:efab]/