Hi Carl,

I think that underscore in a hostname actually is not valid, if you look at 
RFC 952, the definition host hostname boils down to:

<name>  ::= <let>[*[<let-or-digit-or-hyphen>]<let-or-digit>]

Which means a letter followed by zero or more letters, digits or hyphens 
ending with a letter or a digit. I think docker actually has been changed 
to not use underscore (I think this ticket is about 
that https://github.com/docker/docker/issues/22057)

Akka Team

On Saturday, October 15, 2016 at 8:13:08 PM UTC+2, Carl Pulley wrote:
> Interestingly, AddressFromURIString is also used in 
> akka.cluster.ClusterSettings - and so seeding using DNS names with 
> underscores in their hostnames is also problematic (especially as in my 
> example use cases I don't have any control over the choice of the DNS name).
> Is this an intended design decision (if so, I'd like to understand this 
> decision better please) or should this be considered a bug/issue?
> Many thanks,
>   Carl.

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