Anyone know which ISP has support for "CN2 GIA" that some VPS are using?
According to this website (in Chinese)
https://www.vps234.com/xinjiapo-cn2-gia-vps-tuijian/
These VPS has low latency to China as they are using "CN2 GIA" connection.
I believe the answer is NONE and you have to pay for the VPS.
The VPS may have their own host provider, or hosted by the local ISPs. But you will not be able to leverage the special route with fast access to China websites.
Personally I have the paid AJS China VPN service, mainly for streaming services since I have paid services like QQ Music, Tencent Video and Youku. It also provides lower latency to Chinese website but I do not really use AJS for that purpose.
Just an example ping without and with AJS.
~ $ ping s.taobao.com
PING v6-sh-sz-zb.wagbridge.alibaba.taobao.com.gds.alibabadns.com (59.82.9.90) 56(84) bytes of data.
64 bytes from 59.82.9.90: icmp_seq=1 ttl=80 time=213 ms
64 bytes from 59.82.9.90: icmp_seq=2 ttl=80 time=239 ms
64 bytes from 59.82.9.90: icmp_seq=3 ttl=80 time=329 ms
64 bytes from 59.82.9.90: icmp_seq=4 ttl=80 time=264 ms
64 bytes from 59.82.9.90: icmp_seq=5 ttl=80 time=373 ms
64 bytes from 59.82.9.90: icmp_seq=6 ttl=80 time=293 ms
64 bytes from 59.82.9.90: icmp_seq=7 ttl=80 time=315 ms
^C
--- v6-sh-sz-zb.wagbridge.alibaba.taobao.com.gds.alibabadns.com ping statistics ---
7 packets transmitted, 7 received, 0% packet loss, time 7965ms
rtt min/avg/max/mdev = 213.887/290.176/373.930/51.097 ms
~ $ ping s.taobao.com
PING v6-sh-sz-zb.wagbridge.alibaba.taobao.com.gds.alibabadns.com (59.82.9.84) 56(84) bytes of data.
64 bytes from 59.82.9.84: icmp_seq=1 ttl=86 time=113 ms
64 bytes from 59.82.9.84: icmp_seq=2 ttl=86 time=126 ms
64 bytes from 59.82.9.84: icmp_seq=3 ttl=86 time=107 ms
64 bytes from 59.82.9.84: icmp_seq=4 ttl=86 time=117 ms
64 bytes from 59.82.9.84: icmp_seq=5 ttl=86 time=121 ms
64 bytes from 59.82.9.84: icmp_seq=6 ttl=86 time=125 ms
^C
--- v6-sh-sz-zb.wagbridge.alibaba.taobao.com.gds.alibabadns.com ping statistics ---
6 packets transmitted, 6 received, 0% packet loss, time 5008ms
rtt min/avg/max/mdev = 107.241/118.626/126.411/6.731 ms