Plala/Bフレニューファミリー@東京都町田市

Tracing route to 2ch.net [64.71.145.43]
over a maximum of 30 hops:

1 * 3 ms 3 ms 218.47.161.207
2 3 ms 3 ms 3 ms 218.47.161.193
3 11 ms 10 ms * 219.167.250.73
4 * * * Request timed out.
5 6 ms 5 ms 7 ms 61.207.26.117
6 8 ms 7 ms 7 ms 219.160.10.13
7 * 9 ms * 61.207.0.154
8 * 13 ms * 61.213.161.213
9 * 10 ms 10 ms xe-1-0-0.r21.tokyjp01.jp.bb.verio.net [61.213.162.233]
10 140 ms 141 ms * p16-5-0-0.r80.mlpsca01.us.bb.verio.net [129.250.4.153]
11 139 ms 139 ms 140 ms p16-0-1-3.r20.mlpsca01.us.bb.verio.net [129.250.2.56]
12 138 ms 137 ms 149 ms p64-0-0-0.r21.snjsca04.us.bb.verio.net [129.250.5.3]
13 * 138 ms 139 ms p16-2-0-0.r01.snjsca04.us.bb.verio.net [129.250.2.119]
14 125 ms 126 ms 125 ms sjo-ix.he.net [206.223.116.37]
15 140 ms 140 ms 140 ms gige-g5-0.gsr12008.fmt.he.net [216.218.214.217]
16 141 ms 142 ms 138 ms 2ch.net [64.71.145.43]

Trace complete.

ところどころで応答がないのは何故だろうか