open(IPFILE,"<iplist.txt"); # open readonly
    || die "Could not open iplist.txt:$! \n";
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will make the script fall over, due the extraneous semi-colon after the open call.

@openip = split('.',$stip); # split(/\./,$stip); reproduces the original problem. That backslash needs to be there.

What's the point of offering a rewritten version, if you're not even going to test it? Oh, XP whoring :-)

I have to agree though, the use of strict, and moving chomp do make life easier in the long run.

Just for the record, having fixed those two problems, I get:

10.1.2.2
10.1.2.200
4