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Use of uninitialized value $destination_IP in string ne at...

ns1.sina.com.cn. 80800 IN A 202.106.184.166

clear in_list flag
FOR each line in the data file
...
    ENDIF
  ENDELSE
ENDFOR

#! perl
use strict;
...
traceroute to 221.204.248.107 (221.204.248.107), 30 hops max, 60 byte 
+packets
 1  134.2.173.254  0.170 ms  0.191 ms  0.185 ms
etc.

Destination to 92.123.72.112 but reached 92.123.72.0
Destination to 78.108.81.20 but reached 217.106.1.146
Destination to 208.78.244.38 but reached 208.78.244.0