Pen.co.jp availability was analyzed 2 times during the 28 day period starting on December 30, 2024. Over 2 instances out of all conducted checks, pen.co.jp has shown functionality, with the latest uptime on December 30, 2024, returning a code 200. Testing shows that there have never been any inoperability issues with pen.co.jp as of January 27, 2025. Based on the replies that were received, it was determined that as of January 27, 2025, all responses were error-free. The recorded response time differed for pen.co.jp, being 0.040 seconds on December 30, 2024, against 1.067 seconds on average.