quova ip address checking. don't forget to set your api-key and secret

gistfile1.txt

#!/usr/bin/env python
import urllib2
import md5
import time
import sys, re

service = 'http://api.quova.com/'
version = 'v1/'
method = 'ipinfo/'
apikey = ''  
secret = ''

hash = md5.new()
# seconds since GMT Epoch
timestamp = str(int(time.time()))
sig = md5.new(apikey + secret + timestamp).hexdigest()

def is_valid_ipv4(ip):
    """Validates IPv4 addresses.
    """
    pattern = re.compile(r"""
        ^
        (?:
          # Dotted variants:
          (?:
            # Decimal 1-255 (no leading 0's)
            [3-9]\d?|2(?:5[0-5]|[0-4]?\d)?|1\d{0,2}
          |
            0x0*[0-9a-f]{1,2}  # Hexadecimal 0x0 - 0xFF (possible leading 0's)
          |
            0+[1-3]?[0-7]{0,2} # Octal 0 - 0377 (possible leading 0's)
          )
          (?:                  # Repeat 0-3 times, separated by a dot
            \.
            (?:
              [3-9]\d?|2(?:5[0-5]|[0-4]?\d)?|1\d{0,2}
            |
              0x0*[0-9a-f]{1,2}
            |
              0+[1-3]?[0-7]{0,2}
            )
          ){0,3}
        |
          0x0*[0-9a-f]{1,8}    # Hexadecimal notation, 0x0 - 0xffffffff
        |
          0+[0-3]?[0-7]{0,10}  # Octal notation, 0 - 037777777777
        |
          # Decimal notation, 1-4294967295:
          429496729[0-5]|42949672[0-8]\d|4294967[01]\d\d|429496[0-6]\d{3}|
          42949[0-5]\d{4}|4294[0-8]\d{5}|429[0-3]\d{6}|42[0-8]\d{7}|
          4[01]\d{8}|[1-3]\d{0,9}|[4-9]\d{0,8}
        )
        $
    """, re.VERBOSE | re.IGNORECASE)
    return pattern.match(ip) is not None

def is_valid_ipv6(ip):
    """Validates IPv6 addresses.
    """
    pattern = re.compile(r"""
        ^
        \s*                         # Leading whitespace
        (?!.*::.*::)                # Only a single whildcard allowed
        (?:(?!:)|:(?=:))            # Colon iff it would be part of a wildcard
        (?:                         # Repeat 6 times:
            [0-9a-f]{0,4}           #   A group of at most four hexadecimal digits
            (?:(?<=::)|(?<!::):)    #   Colon unless preceeded by wildcard
        ){6}                        #
        (?:                         # Either
            [0-9a-f]{0,4}           #   Another group
            (?:(?<=::)|(?<!::):)    #   Colon unless preceeded by wildcard
            [0-9a-f]{0,4}           #   Last group
            (?: (?<=::)             #   Colon iff preceeded by exacly one colon
             |  (?<!:)              #
             |  (?<=:) (?<!::) :    #
             )                      # OR
         |                          #   A v4 address with NO leading zeros 
            (?:25[0-4]|2[0-4]\d|1\d\d|[1-9]?\d)
            (?: \.
                (?:25[0-4]|2[0-4]\d|1\d\d|[1-9]?\d)
            ){3}
        )
        \s*                         # Trailing whitespace
        $
    """, re.VERBOSE | re.IGNORECASE | re.DOTALL)
    return pattern.match(ip) is not None

for line in iter(sys.stdin.readline, ''):
  if is_valid_ipv4(line):
    url = service + version + method + line + '?apikey=' + apikey + '&sig=' + sig + '&format=json'
    sys.stderr.write(url)
    sys.stderr.write("\n")

    rs = urllib2.urlopen(url).read()
    print rs
  else:
    sys.stderr.write( "ipvalid ipv4 address: %s\n" % line)