For general IPv4 cases,  one can specify target host address via AT Internet Service Command in a format like below:

AT^SISS=0,"address","socktcps://www.google.com.tw:443"

AT^SISS=0,"address","socktcps://215.58.200.228:443"

If one was forced to use IPv6 network, the URL string specified via FQDN is still OK:

AT^SISS=0,"address","socktcps://www.google.com.tw:443" 

However for IPv6 address one has to change it into this:

AT^SISS=0,"address","socktcps://[2404:6800:4008:802::2004]:443" 

The brackets [] is the key to the IPv6 URL string.

The contype also has to change to GPRS6:

AT^SICS=0,conType,GPRS6

Below is a more complet AT command log for you to reference:

ati1

Cinterion

EHS6-A

REVISION 03.001

A-REVISION 00.000.51

OK

at^sjam=5

^SJAM: "a:/JRC-1.56.54.jad","Java Remote Control MIDlet Suite","Cinterion","1.56.54",1

OK

at^sics=0,conType,none

OK

at^sics=0,conType,gprs6

OK

at^sics=0,apn,internet

OK

at^siss=0,srvtype,socket

OK

at^siss=0,conId,0

OK

at^siss=0,address,"socktcp://[2404:6800:4008:802::2004]:8888"

OK