IP parsing results in an odd value

Question

On my computer, the following line:

System.Net.IPAddress result = default(System.Net.IPAddress);
bool success = System.Net.IPAddress.TryParse("234.34.034.004", out result);

creates the following results

success evaluates to true
The IP Address result returned is 234.34.28.4

What is happening?

34 in decimal form is 22 in hex, so that doesn't describe what's happening — bwall
– bwall, Commented Sep 30, 2019 at 22:02

robsiemb · Accepted Answer · 2019-09-30 22:20:39Z

1

It appears that the "34" is being interpreted as octal because it has a leading zero. (The 4 probably also is being interpreted as octal, but its representation is the same in both bases).

34 in octal is 28 in decimal, thus the output.

answered Sep 30, 2019 at 22:20

robsiemb

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1 Comment

dave_thompson_085 Over a year ago

Quite possibly because (winsock) inet_addr does so although System.Net.IPAddress doc doesn't say so.

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