Is this domain’s certificate valid?

Who issued it, and when it expires.

Try cloudflare.com, github.com. One domain in, one answer out. No account needed.
CONTINUOUS INTERNET TELEMETRY24H DRIFT29,724 material changesacross 23,440 domains · 24h to ~4h agoROTATION59 domains moved DNS from magpiedns.com to koaladns.com, 58 moved backa rotation loop, not a migration · 24hCERT DRIFT1 domains switched issuing CA24hREGISTRAR DRIFT3 changed registrar24hNOW610 curated domains not reachablelast probe, steadySITE ERRORS17,392 sites serving errorslast probe · 5xx / 404 / TLSBOT DEFENSEbot defense observed on 79,534 sites429 rate-limit / 403 bot-block, a posture signal