tracert IP address or Domain name
JPNIC who is Gateway
ipconfig
arp-a
nslookup
netstat
Tools
HoverIP http://www.hoverdesk.net/freeware.htm
Look@LAN http://www.lookatlan.com/
Wireshark formerly Ethereal スニファー機能 http://sourceforge.net/project/showfiles.php?group_id=255
Productkey 検索 http://www.nirsoft.net/utils/product_cd_key_viewer.html
Protected storage passview http://www.nirsoft.net/utils/pspv.html
