Local Website via ESP8266 E12 <-- how to make a steady IP Adress?

I just tried the localhost... it did not work.

Second note: the local website has to be reached from every browser...

Third note: there is no problem to connect a smartphone to the ESP.

I just tried it to get access to the webpage. Here are some new facts:

  • I have codes the ESP's SSID with the IP Adress, in other words: if you do a wifi scan, than you are able to see a SSID called "(IP unset)".
  • you can connect to the SSID, so no problem with that
  • you can also access to the website with IP 192.168.4.1

Why does not show up at the SSID ? two month ago, it worked. two month ago, I did put the IP directly to the SSID. It worked than. you could see as SSID this: 192.168.4.1 <-- so it worked

My only fear ist, that this IP adress could change sometime. So agian: is there a way to make it steady ? The best way would be, to reach it via hostname, for example: http://esp