{"domain":"fastmail.com","port":443,"address":"103.168.172.65","resolved_addresses":["103.168.172.65"],"verified":true,"verification":"Certificate chain, hostname and dates verified using this server\u2019s CA store.","verification_error":null,"certificate":{"subject":{"CN":"*.fastmail.com"},"issuer":{"C":"US","O":"Let's Encrypt","CN":"YR2"},"serial":"061783AF76B7B7CE0EBFD6F2F40C5002D26B","version":3,"valid_from":"2026-09-14T00:20:06+00:00","valid_to":"2026-12-13T00:20:05+00:00","validity":"valid_period","days_remaining":58,"san":"DNS:*.api.beta.fastmail.com, DNS:*.api.dogfood.fastmail.com, DNS:*.api.fastmail.com, DNS:*.api.qa.fastmail.com, DNS:*.beta.fastmail.com, DNS:*.caldav.fastmail.com, DNS:*.carddav.fastmail.com, DNS:*.dogfood.fastmail.com, DNS:*.fastmail.com, DNS:*.qa.fastmail.com, DNS:fastmail.com","signature":"RSA-SHA256","sha256":"D1:76:4B:B6:D5:35:16:18:99:1B:42:5A:8F:37:B5:72:F4:4C:6D:FC:1E:6E:AD:40:36:90:B8:D8:4D:CF:89:6F","key_type":"RSA","key_bits":2048,"curve":null,"extensions":{"keyUsage":"Digital Signature, Key Encipherment","extendedKeyUsage":"TLS Web Server Authentication","basicConstraints":"CA:FALSE","subjectKeyIdentifier":"5A:06:31:2D:DE:91:8E:6C:2F:8B:7F:CD:5E:23:F4:E0:1F:B4:80:20","authorityKeyIdentifier":"40:15:2D:26:79:ED:32:20:9E:DF:9A:72:1D:D6:32:1F:81:0C:81:0C","authorityInfoAccess":"CA Issuers - 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Server-presented chain; no revocation, OCSP, CT or full TLS security scan."}