How to determine if a string is a valid IPv6 address in C++?

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IPv6 parsing in C

I need to check strings if they are valid IPv6 addresses in C++.

There are elegant solutions for C# here and rather ugly regex here.

Is there a good way to do this in C++ ?

I'm currently using this, but it doesn't work on Windows XP (inet_pton() is missing):

unsigned char buf[sizeof(struct in6_addr)];
bool isvalid= inet_pton(PF_INET6, (const char *)addr, buf);

`getaddrinfo()` (from duplicate question) looks to be available in XP if you don't have `inet_pton()` — CharlesB, Jun 06 '11 at 14:52
Vote to reopen, since the linked question explicitly tags C, while this question tags C++. The linked C question may lack some answers, which requires C++ libraries, like boost. Actually, there is at least one [option](https://wandbox.org/permlink/1gT45B8BaN64dnSr), which uses boost::asio. — Alex Che, Nov 04 '21 at 14:23

score 2 · Accepted Answer · answered Jun 06 '11 at 14:53

2

You can use getaddrinfo in Linux, or in Windows since Windows 2000. (See the section of that document page entitled "Example code using AI_NUMERICHOST")

answered Jun 06 '11 at 14:53

Ken Bloom

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score 0 · Answer 2 · answered Jun 06 '11 at 14:56

0

You can use WSAStringToAddress, available since Windows 2000.

answered Jun 06 '11 at 14:56

Ken Bloom

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How to determine if a string is a valid IPv6 address in C++?

2 Answers2