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To: "Mainz, Roland" <Roland DOT Mainz AT rovema DOT de>,
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Subject: RE: Cygwin/Win32 utility function to convert "raw" IPv6 address
 string into *.ipv6-literal.net string ?
Thread-Topic: Cygwin/Win32 utility function to convert "raw" IPv6 address
 string into *.ipv6-literal.net string ?
Thread-Index: AQHZ8WDtscGMzsE4r0uGxl26il4SurAu4lGw
Date: Wed, 27 Sep 2023 17:02:23 +0000
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From: "Lavrentiev, Anton \(NIH/NLM/NCBI\) \[C\] via Cygwin" <cygwin AT cygwin DOT com>
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Sender: "Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>

> Does Cygwin (or Win32) have a function to convert "raw" ASCII IPv6 addresses into *.ipv6-
> literal.net per

If Windows API is documented to have such a function, you should be able find it in the w32api package in Cygwin.

As for the "literal" representation, the only "standard" and documented IPv6 DNS notation is in the
.ip6.arpa domain (the analog for IPv4's "in-addr.arpa").  Microsoft seems to have uniquely "enhanced" that
convention to use a more compact notation...  Even though it says it resolves internally without DNS on Windows,
this convention is not likely portable (and will cause an actual DNS hit on other platforms that do not specially
recognize ".ipv6-literal.net" -- unlike the treatment of ".ip6.arpa").  And a likely result of that is going
to be "NXDOMAIN" (domain does not exist).

HTH,

Anton Lavrentiev
Contractor NIH/NLM/NCBI

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