From owner-freebsd-hackers@FreeBSD.ORG  Fri Jun  8 07:43:38 2012
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Date: Fri, 08 Jun 2012 11:43:25 +0400
From: "Alexander V. Chernikov" <melifaro@FreeBSD.org>
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To: Jonathan McKeown <j.mckeown@ru.ac.za>
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Cc: freebsd-hackers@freebsd.org, net@freebsd.org
Subject: Re: ifconfig accepting hostname as ipv4 address
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On 08.06.2012 11:20, Jonathan McKeown wrote:
> On Thursday 07 June 2012 17:00:04 Alexander V. Chernikov wrote:
>> Hello list!
>>
>> Since the early days ifconfig(8) has the following functionality:
>
> [hostname in place of literal address]
>
>> Moreover, ifconfig em0 some_valid_fqdn/MASK silently ignores it, so you
>> can't set valid CIDR address using this notation.
>
> I'm not sure that's true. Have you tried it? Because it seems to work here.
Strangely enough, it works on another machine. Ok, this one works and 
can unfortunately be used by other people.

However, original question remains.

>
> Jonathan
>