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468. Validate IP Address

Description

Given a string queryIP, return "IPv4" if IP is a valid IPv4 address, "IPv6" if IP is a valid IPv6 address or "Neither" if IP is not a correct IP of any type.

A valid IPv4 address is an IP in the form "x1.x2.x3.x4" where 0 <= xi <= 255 and xi cannot contain leading zeros. For example, "192.168.1.1" and "192.168.1.0" are valid IPv4 addresses while "192.168.01.1", "192.168.1.00", and "192.168@1.1" are invalid IPv4 addresses.

A valid IPv6 address is an IP in the form "x1:x2:x3:x4:x5:x6:x7:x8" where:

• 1 <= xi.length <= 4
• xi is a hexadecimal string which may contain digits, lowercase English letter ('a' to 'f') and upper-case English letters ('A' to 'F').
• Leading zeros are allowed in xi.

For example, "2001:0db8:85a3:0000:0000:8a2e:0370:7334" and "2001:db8:85a3:0:0:8A2E:0370:7334" are valid IPv6 addresses, while "2001:0db8:85a3::8A2E:037j:7334" and "02001:0db8:85a3:0000:0000:8a2e:0370:7334" are invalid IPv6 addresses.

 

Example 1:

Input: queryIP = "172.16.254.1"
Output: "IPv4"
Explanation: This is a valid IPv4 address, return "IPv4".

Example 2:

Input: queryIP = "2001:0db8:85a3:0:0:8A2E:0370:7334"
Output: "IPv6"
Explanation: This is a valid IPv6 address, return "IPv6".

Example 3:

Input: queryIP = "256.256.256.256"
Output: "Neither"
Explanation: This is neither a IPv4 address nor a IPv6 address.

 

Constraints:

• queryIP consists only of English letters, digits and the characters '.' and ':'.

Solutions

• Python
• TypeScript
• RenderScript

• class Solution:
      def validIPAddress(self, IP: str) -> str:
          if "." in IP:
              segments = IP.split(".")
              if len(segments) != 4:
                  return "Neither"
              for segment in segments:
                  if (
                      not segment.isdigit()
                      or not 0 <= int(segment) <= 255
                      or (segment[0] == "0" and len(segment) > 1)
                  ):
                      return "Neither"
              return "IPv4"
          elif ":" in IP:
              segments = IP.split(":")
              if len(segments) != 8:
                  return "Neither"
              for segment in segments:
                  if (
                      not segment
                      or len(segment) > 4
                      or not all(c in string.hexdigits for c in segment)
                  ):
                      return "Neither"
              return "IPv6"
          return "Neither"
  
  

• function validIPAddress(queryIP: string): string {
      const isIPv4 = () => {
          const ss = queryIP.split('.');
          if (ss.length !== 4) {
              return false;
          }
          for (const s of ss) {
              const num = Number(s);
              if (num < 0 || num > 255 || num + '' !== s) {
                  return false;
              }
          }
          return true;
      };
      const isIPv6 = () => {
          const ss = queryIP.split(':');
          if (ss.length !== 8) {
              return false;
          }
          for (const s of ss) {
              if (s.length === 0 || s.length > 4) {
                  return false;
              }
              for (const c of s) {
                  if ((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F')) {
                      continue;
                  }
                  return false;
              }
          }
          return true;
      };
      if (isIPv4()) {
          return 'IPv4';
      }
      if (isIPv6()) {
          return 'IPv6';
      }
      return 'Neither';
  }
  
  

• impl Solution {
      fn is_IPv4(s: &String) -> bool {
          let ss = s.split('.').collect::<Vec<&str>>();
          if ss.len() != 4 {
              return false;
          }
          for s in ss {
              match s.parse::<i32>() {
                  Err(_) => {
                      return false;
                  }
                  Ok(num) => {
                      if num < 0 || num > 255 || num.to_string() != s.to_string() {
                          return false;
                      }
                  }
              }
          }
          true
      }
  
      fn is_IPv6(s: &String) -> bool {
          let ss = s.split(':').collect::<Vec<&str>>();
          if ss.len() != 8 {
              return false;
          }
          for s in ss {
              if s.len() == 0 || s.len() > 4 {
                  return false;
              }
              for &c in s.as_bytes() {
                  if
                      (c >= b'0' && c <= b'9') ||
                      (c >= b'a' && c <= b'f') ||
                      (c >= b'A' && c <= b'F')
                  {
                      continue;
                  }
                  return false;
              }
          }
          true
      }
  
      pub fn valid_ip_address(query_ip: String) -> String {
          if Self::is_IPv4(&query_ip) {
              return String::from("IPv4");
          }
          if Self::is_IPv6(&query_ip) {
              return String::from("IPv6");
          }
          String::from("Neither")
      }
  }
  
  

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