Name of Captive Portal software?

Does anyone know the software of captive portal mainly found in Thailand hotels and restaurants? When connecting to WiFi, then login page show with the following URL.

http://xxx.xxx.com/cgi-bin/login.cgi?ip=172.27.x.x&mac=xx:xx:xx:xx:xx:xx&url=http://www.google.com&mobile=0

The following URL can also access.

*http://172.27.0.1/cgi-bin/status.cgi
*http://172.27.0.1/cgi-bin/welcome.cgi
*http://172.27.0.1/cgi-bin/connect.cgi
*http://172.27.0.1/cgi-bin/chgpwd.cgi