<http://uptime.netcraft.com/up/graph/?mode_u=off&mode_w=on&site=www.cnn.com>
Works for me, works from any system that has a browser. At any given time I'm *far* more likely to have a browser running than port scanning software, so this solution is also IMHO faster.
Until today netcraft listed agamemnon.cnchost.com as unknown. I ran nmap to see what it says, so I guess you should assume I'm hostile. ;-) Interesting ports on agamemnon.cnchost.com (207.155.252.31): (The 1519 ports scanned but not shown below are in state: closed) Port State Service 21/tcp open ftp 25/tcp open smtp 80/tcp open http 110/tcp open pop-3 TCP Sequence Prediction: Class=truly random Difficulty=9999999 (Good luck!) No OS matches for host (If you know what OS is running on it, see http://www.insecure.org/cgi-bin/nmap-submit.cgi). TCP/IP fingerprint: TSeq(Class=TR) T1(Resp=Y%DF=Y%W=6045%ACK=S++%Flags=AS%Ops=NWM) T2(Resp=N) T3(Resp=N) T4(Resp=Y%DF=Y%W=0%ACK=O%Flags=R%Ops=) T5(Resp=Y%DF=Y%W=0%ACK=S++%Flags=AR%Ops=) T6(Resp=Y%DF=Y%W=0%ACK=O%Flags=R%Ops=) T7(Resp=Y%DF=Y%W=0%ACK=S++%Flags=AR%Ops=) PU(Resp=N)