PHPC currently reports the host string and port number for mongoc_host_list_t structs (e.g. Server::getHost(), Server::getPort()). That struct also has a family field, which I believe is used to indicate a socket type (e.g. IPv4, IPv6, Unix domain socket). We should consider exposing that information if it's relevant (or important enough) and cannot easily be inferred from the host/port values.