I am new to Go so feel free to point out if I am breaking protocol but I ran into the function DefaultMask() in the net package and did some research. This function returns the IPMask by assuming that you are using IP class A, B, and C addresses. But this concept is from the early days of the Internet, and was superseded by CIDR in 1993. See https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing for the history here. I looked around both this group and on Stack Overflow to see what people had posted about this function. The only reference in golang-nuts was to someone using this call to decide if an address was IPv4 or not. As the last posting on that thread pointed out, you can use To4() for the same purpose (since DefaultMask actually calls To4). The only reference on Stack Overflow was someone using it to get the "Next IP address". Sorry but I don't understand what he was doing. If you want the IPMask for 127.0.0.1, you can just get that interface and get the mask that way. I even tried Google for "golang DefaultMask" and only found hits about non network things. So I don't believe that this function is useful today and should be deprecated, maybe with a message about using To4() if you just want to see if an address is IPv4.
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