net.traceroute

Trace routes from various sources to a host by sending different types of sent packages.

IDN
» close á à ă â å ä ã ą ā æ ć ĉ
č ċ ç ď đ é è ĕ ê ě ë ė ę ē ğ ĝ
ġ ģ ĥ ħ í ì ĭ î ï ĩ į ī ı ĵ ķ ĺ
ľ ļ ł ń ň ñ ņ ŋ ó ò ŏ ô ö ő õ ø
ō œ ĸ ŕ ř ŗ ś ŝ š ş ť ţ ŧ ú ù ŭ
û ů ü ű ũ ų ū ŵ ý ŷ ÿ ź ž ż ð þ

udp icmp tcp layer4
origin:   clez.net Serversniff eibler.at
about: clez.net, AS8972, [de] Frankfurt/Main, map
info

What's this?

Traceroute tries to step through all hosts on a route by increasing the Time-To-Live of each package step by step. Unix traceroute usually sends UDP datagrams, Windows systems prefer ICMP. The response is an ICMP "Destination reached" anyway.
If you happen to get "* * *" in response, this hop refuses to send proper ICMP responses.