为了整理和便于参考，把Limestone 达拉斯机房的IP地址段给搜集下：

69.162.64.0 - 69.162.127.255
74.63.192.0 - 74.63.255.255
208.115.192.0 - 208.115.255.255
216.245.192.0 - 216.245.223.255

随便ping了一个，好像不怎么样


Pinging 69.162.127.22 with 32 bytes of data:

Reply from 69.162.127.22: bytes=32 time=469ms TTL=114
Reply from 69.162.127.22: bytes=32 time=461ms TTL=114
Reply from 69.162.127.22: bytes=32 time=440ms TTL=114
Reply from 69.162.127.22: bytes=32 time=445ms TTL=114
Reply from 69.162.127.22: bytes=32 time=463ms TTL=114

这速度，还卖那么贵。官方网站也不行：

Pinging www.limestonenetworks.com [74.63.205.206] with 32 bytes of data:

Reply from 74.63.205.206: bytes=32 time=424ms TTL=53
Reply from 74.63.205.206: bytes=32 time=418ms TTL=53
Reply from 74.63.205.206: bytes=32 time=411ms TTL=53
Reply from 74.63.205.206: bytes=32 time=409ms TTL=53
Reply from 74.63.205.206: bytes=32 time=404ms TTL=53

208.115.192.0 - 208.115.255.255 新增的IP段，2010年1月6号ARIN新分配给LimestoneNetworks的。