python:
IP_MOD_BASE = 256
def ipstr_to_ip2(ipstr):
a = int(ipstr)
c , b = divmod(a, IP_MOD_BASE)
e, d = divmod(c, IP_MOD_BASE)
g, f = divmod(e, IP_MOD_BASE)
tmp, h = divmod(g, IP_MOD_BASE)
return str(h) + "." + str(f) + "." + str(d) + "." + str(b)
