指定したホストへのパケットの経路(パケットを中継するルーター)を表示し, パケットが目的のネットワークまでどの経路を辿ったかを確認できます。

traceroute [option] [host]

■普通に使う場合

$ traceroute flateight.com
traceroute to flateight.com (59.106.13.38), 64 hops max, 40 byte packets
1   218.227.247.99 (218.227.247.99)  17.042 ms  16.092 ms  16.146 ms
2   218.227.247.126 (218.227.247.126)  16.920 ms  17.880 ms  16.116 ms
3   219.107.255.254 (219.107.255.254)  19.165 ms  18.637 ms  18.326 ms
4   133.205.1.1 (133.205.1.1)  18.896 ms  18.610 ms  19.348 ms
5   210.173.176.63 (210.173.176.63)  19.075 ms  19.789 ms  18.082 ms
6   tksrt1b-crt2-10g.bb.sakura.ad.jp (202.222.26.9)  18.871 ms  21.272 ms  22.370 ms
7   tksrt2b-srt1b-10g.bb.sakura.ad.jp (202.222.26.110)  20.533 ms  20.481 ms  20.340 ms
8   tkgrt1b-srt2b-10g.bb.sakura.ad.jp (202.181.110.2)  20.601 ms  20.498 ms  20.561 ms
9   tkgrt1x-grt1b-2.bb.sakura.ad.jp (202.181.110.114)  19.612 ms  20.429 ms  20.632 ms
10  tkgrt5e-grt1b.bb.sakura.ad.jp (202.181.110.46)  19.070 ms  20.474 ms  18.599 ms
11  www408.sakura.ne.jp (59.106.13.38)  17.755 ms  18.994 ms  19.141 ms

■IPだけで表示する。

$ traceroute -n flateight.com
traceroute to flateight.com (59.106.13.38), 64 hops max, 40 byte packets
1   218.227.247.99  15.343 ms  16.687 ms  17.387 ms
2   218.227.247.126  15.606 ms  16.675 ms  15.671 ms
3   219.107.255.254  19.127 ms  18.568 ms  17.671 ms
4   133.205.1.1  16.635 ms  19.143 ms  16.876 ms
5   210.173.176.63  18.852 ms  17.649 ms  18.843 ms
6   202.222.26.9  21.552 ms  21.073 ms  20.126 ms
7   202.222.26.110  19.823 ms  19.307 ms  21.847 ms
8   202.181.110.2  20.335 ms  22.357 ms  20.081 ms
9   202.181.110.114  19.862 ms  19.305 ms  19.623 ms
10  202.181.110.46  18.858 ms  17.121 ms  17.649 ms
11  59.106.13.38  22.308 ms  19.329 ms  22.332 ms