Update Server?

There were two connections when I did “Check For Updates”.
First Ip address: 91.199.212.171 and second Ip Address: 216.126.215.171

I know “91.199.212.171”(download.comodo.com) is a COMODO’s Server.
So,second Ip Address “216.126.215.171”(SISNA??) is a COMODO’s another Update server?
What is this connection?