import os
import socket
import struct
d1="science-city.ir"
d2=d1.split(".")
d3=""
for itm in d2:
    d3+=struct.pack("B",len(itm))
    d3+=itm
d3+="\x00"
data="db4201000001000000000000".decode("hex")+d3+"00010001".decode("hex")
print data.encode("hex")
s1=socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
s1.settimeout(10)
s1.sendto(data,("91.98.111.175",53))
try:
    data=s1.recvfrom(1024)
except:
    data="error"
print "hello world",data
hf=open("/home/tc/test.txt","wb")
hf.write("123")
hf.close()