Looks like wildcard certs have arrived to letsencrypt.org: https://community.letsencrypt.org/t/acme-v2-production-environment-wildcards/55578 And, happy pi day! $ echo 'scale=64; 4*a(1)' | bc -l 3.1415926535897932384626433832795028841971693993751058209749445920 $