The free WiFi offer for visitors is accessible through the SSID (name of the WiFi network) #hotspot.koelnmesse. After the registration on the portal page of this network, the free internet access is available to you.
WiFi internet access Koelnmesse
Infoscout - The Koelnmesse visitor information system
You can access the Web-based information system Infoscout free of charge through the Web browser via the WiFi network in the trade fair halls.