一応 IIJ4Uにも送った trace結果(の一部)を晒させていただきます。

IX-gate3.IIJ.Net 210.130.130.43 6 39ms 38ms 0% 100 / 100 37ms / 50ms
as6461.nspixp2.wide.ad.jp 202.249.2.102 7 41ms 39ms 3% 97 / 100 37ms / 49ms
so-2-1-0.cr2.nrt3.jp.mfnx.net 208.184.210.74 8 38ms 39ms 1% 99 / 100 37ms / 53ms
pos7-1.er1a.nrt3.jp.mfnx.net 208.184.233.206 9 39ms 39ms 4% 96 / 100 37ms / 50ms
router1-ea.jp.above.net 211.13.230.94 10 41ms 40ms 6% 93 / 100 37ms / 71ms
* Unknown Host * 159.153.168.4 11 38ms 40ms 5% 95 / 100 38ms / 50ms
central-jp2.owo.com 159.153.169.160 12 39ms 40ms 6% 93 / 100 38ms / 66ms