IPv4で接続したのか、それともIPv6で接続したのかは、あなたのIPアドレスを示すREMOTE_ADDRの項で判別できます。
REMOTE_ADDR: 18.117.188.64 (AF_INET) REMOTE_HOST: REMOTE_PORT: 64394 SERVER_PROTOCOL: HTTP/1.1 REQUEST_METHOD: GET REQUEST_URI: /yousentme.php QUERY_STRING: HTTP_ACCEPT: */* HTTP_ACCEPT_CHARSET: HTTP_ACCEPT_ENCODING: HTTP_ACCEPT_LANGUAGE: HTTP_CONNECTION: HTTP_HOST: katsu.watanabe.name HTTP_REFERER: http://katsu.watanabe.name/yousentme.php HTTP_USER_AGENT: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com) REQUEST_TIME_FLOAT: 1713611601.6923 (2024-04-20T20:13:21+09:00)