ESP32 Wifi Problem: IPv4 172.xxx statt 192.xxx

Hi,
my ESP32 is the Accresspoint, and running in AP-Mode.
The Laptop I can connect with LAN or Wifi, to get the datas for Modbus-TCP.
That i’m out of our companys network, i want to use a second network-card with
IP 172.20.30.2 for the ESP32 only. So i try to change his static IP.
Also in serial-debugging i see, that he trys some parts with
DHCP, but first i want a static IP.
Thanks Wolfgang