Try this: Map is pretty fast too...

my @ips;
while(<DATA>){ chomp;  push @ips, map { /\[(\d+\.\d+\.\d+\.\d+)\]/ig }
+ $_; }

print "First IP = $ip[0], Second IP = $ip[1]\n"; 
print "All IP's Found: @ips";

__DATA__
 1 [111.123.164.80] blah blah [123.126.126.126] 87 000:00:00.0000.000.
+000     06/07/2000 04:39:00 PM SNMP: Get
 2 [212.123.34.80] 283.120.123  [3.126.126.126] 87 000:00:00.0000.000.
+000     06/07/2000 04:39:00 PM SNMP: Get
 3 [201.0.164.80] 8.23.1.2.3 [51.126.126.126] 87 000:00:00.0000.000.00
+0     06/07/2000 04:39:00 PM SNMP: Get
 4 [111.123.164.80]  [12.126.126.126] 87 000:00:00.0000.000.000     06
+/07/2000 04:39:00 PM SNMP: Get
[download]

I use this to grab them... cheers