LANs (Local Area Network) and WLANs (Wireless Local Area Network) will typically assign IP Addresses designated for local use (RFC 1918, 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16). In some cases, like some colleges or hotels, you may be assigned a routable (internet) IP Address from joining their LAN, but that is much less common. There's nothing different between a LAN or WLAN, other than WLAN's introduce the ability to transmit data without cables. It is mainly a security designation.