>expresses an IPv6 literal for a URL, while writting this: > [3ffe:456:45e::34]:23 >would be clear to someone as meaning the telnet port at address >3ffe:456:45e::34? though there are uses like above in some configuration files for softwares, i personally don't think it too widely accepted. I'd write: 3ffe:456:45e::34 port 23 itojun