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Validating ip address in java

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String object and a pointer overhead in Java is rather in the neighborhood of 44 bytes.Therefore, someone sending you a 10 Mi B string is typically going to overflow the heap space.and commons.apache.org/proper/commons-validator/apidocs/src-html‌​/… Say it is invalid formvalidation.io/validators/ip and csgnetwork.com/directipverify.html?IPvalue= say it is valid ping: cannot resolve Unknown host Summary: IP segment starting with 0 indicates that the segment is in octal, so we also need to validate that the remaining digits do not contain 7,8 (I admit i didn't know this before: thats y i gave the examples as The correct test case to test is - which fails) Long story short: The above validation is not correct and can lead to false positives The method checks if it is an instance of Inet4Address and if the parameter was the ip-address and not the hostname.

According to Wikipedia, IPv4 addresses are canonically represented in dot-decimal notation, which consists of four decimal numbers, each ranging from 0 to 255, separated by dots, e.g., 1.1 step 2) ……..a) If ptr contains any character which is not digit then return 0 ……..b) Convert “ptr” to decimal number say ‘NUM’ ……..c) If NUM is not in range of 0-255 return 0 ……..d) If NUM is in range of 0-255 and ptr is non-NULL increment “dot_counter” by 1 ……..e) if ptr is NULL goto step 3 else goto step 1 step 3) if dot_counter !

Depending on the source of the input, the validation function might pose a huge performance risk and cause OM (out of memory) errors.

See, even really short strings of just dots create one String object per character.

I am wondering why this is still no part of some third party library.

I mean avoiding third party libraries is good but figuring the regex for that is highly error-prone which is in my opinion worse than using a third party [email protected] Arthur Four dotted numbers is a pretty standard representation of an IPV4 address.