CSB Who Is is the admin lookup you reach for when cross-referencing bans or checking for VPNs. amx_who dumps a card for every connected player to your console: userid, name, SteamID, IP, GeoIP country code and name, ping, minutes on the server and access flags. The say /who menu lets you pick a single player and print just their card.
Country lookup uses the geoip module (geoip_code2 into a three-byte buffer, plus geoip_country for the full name). Time on server is measured from client_putinserver. Inspired by the info commands in the AMX Mod X Admin Commands plugin; independent GPL re-implementation.
amx_who) and single-player menu (say /who).??/Unknown fallback.get_flags.geoip module in addons/amxmodx/configs/modules.ini.csb_admin_who.sma, copy it to addons/amxmodx/plugins/ and add it to plugins.ini.amx_who and /who need the ADMIN_KICK flag (c).