Re: [DNSOP] new version submitted for draft-arends-private-use-tld

Roy Arends <> Tue, 26 May 2020 11:57 UTC

Return-Path: <>
Received: from localhost (localhost []) by (Postfix) with ESMTP id 908F93A0E7F for <>; Tue, 26 May 2020 04:57:14 -0700 (PDT)
X-Virus-Scanned: amavisd-new at
X-Spam-Flag: NO
X-Spam-Score: -2.097
X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Authentication-Results: (amavisd-new); dkim=pass (1024-bit key)
Received: from ([]) by localhost ( []) (amavisd-new, port 10024) with ESMTP id C_Sr5dA-mK6q for <>; Tue, 26 May 2020 04:57:12 -0700 (PDT)
Received: from ( [IPv6:2607:f8b0:4864:20::835]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by (Postfix) with ESMTPS id 4A22A3A0E7A for <>; Tue, 26 May 2020 04:57:12 -0700 (PDT)
Received: by with SMTP id i68so15843409qtb.5 for <>; Tue, 26 May 2020 04:57:12 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=google; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=c9TE7nYfL9/4yE3ktfUAA4RbfcJNfF3MgZw1H1chyQM=; b=fRhNs9QOVOZyJjroQE4YU2Oxa7vuvd8K9ZAG/l7Bl2HqhkkCS/fr3mR8h9s4jmfsir o8XQ2i9MM1i8YqsyLaIfQW+JCH+0Hc17KX/cQU+PABbqEz4IgBSxpnUTFiU6lpBdjZf3 kH8we7f7784bLeT7Gzw0f3Aklrcr/Dkh1KNM8=
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=c9TE7nYfL9/4yE3ktfUAA4RbfcJNfF3MgZw1H1chyQM=; b=AWt90QWpHwfbnYSgHfHCZ7vQvMJCZxQFdg+VnufpB9AmRmHkhfNWIKMOjZ4vb1SaFd GiOnDgGiTY+l/uNEtKTKqpEYOla+YKwinH3vs+usVpRA1DyJ+0m5DadUKHRkwpdAMgqj AJxF3Q8EXwRop5JWzB3dgGNQDOgRRRbpOyj6SSxQVI/gthub2ffkCIS1Sj02AtOD5k8e WI+19m6h28YkDWvaKiGf5HU3NX2Z9eG0BiXNEfPxoxychhqExdo6YaeZ1MY7c+hwcTil 6ddTy3Y3qyptI/aIDx+XolHffm4DLofqZ8jy3Rq5TkVBPosqLixuQ07GHQPR66n9HJ92 +WNg==
X-Gm-Message-State: AOAM5321yrLqmSDpri6maxLif82aYq13GuJ5GIBw6SgdNKatp9gg0Bmj Qo7obwlfHeI5dc44NfQhF7aMtQ==
X-Google-Smtp-Source: ABdhPJxebkhmIiWjSFvlLOkpaIanVHu3kJ9zbWXca8zkkiVy47RALDbMWMPik2y1/UbSopvtPdBWgQ==
X-Received: by 2002:aed:37e7:: with SMTP id j94mr798705qtb.57.1590494231216; Tue, 26 May 2020 04:57:11 -0700 (PDT)
Received: from [] ( []) by with ESMTPSA id e34sm17214211qtb.21.2020. (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 26 May 2020 04:57:10 -0700 (PDT)
Content-Type: text/plain; charset="utf-8"
Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.\))
From: Roy Arends <>
In-Reply-To: <>
Date: Tue, 26 May 2020 12:57:08 +0100
Content-Transfer-Encoding: quoted-printable
Message-Id: <>
References: <> <>
To: Patrick Mevzek <>
X-Mailer: Apple Mail (2.3608.
Archived-At: <>
Subject: Re: [DNSOP] new version submitted for draft-arends-private-use-tld
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: IETF DNSOP WG mailing list <>
List-Unsubscribe: <>, <>
List-Archive: <>
List-Post: <>
List-Help: <>
List-Subscribe: <>, <>
X-List-Received-Date: Tue, 26 May 2020 11:57:15 -0000

Hi Partick

> On 7 May 2020, at 19:40, Patrick Mevzek <> wrote:
> On 02/05/2020 09:09, Roy Arends wrote:
>> Hi,
>> Ed and I just submitted a new version of our private-use TLD draft. 
> While I do not have hard facts but just a gut feeling, I would feel
> safer if "xn" is excluded from the possible list of private labels to be
> used in the DNS, as it is used for prefix of IDNs.

That is a good point. I won’t go as far as excluding it, but I will add a warning.

> Some, probably buggy, software could match on "xn" instead of "xn--" as
> prefix to search for IDNs, and hence having "example.xn" could lead to
> problems.

I agree.

>> This draft has substantial more information than the first draft. It explains that a private-use namespace does not exist, why it is needed, and how a namespace aligned with the user-assigned alpha-2 code elements in the ISO-3166-1 standard can be used as private-use namespace.
>> It contains plenty of examples of how user-assigned code elements are used in the field, including other ISO standards, the UN, UNICODE, CAB/forum, and the IETF itself.
>> This new version came about after fruitful discussions with peers inside and outside the IETF. Most discussions were productive. This has lead to the removal of the advice/example to use ZZ, as it was distracting from the point of the draft: these two-letter top level domains are available for private-use. 
> Thanks for the new draft version, the new content is useful indeed.

Thanks Patrick.



> -- 
> Patrick Mevzek
> _______________________________________________
> DNSOP mailing list