SSL/TLS Certificate Lookup

Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted

openmainframe.net

SSL/TLS Certificate

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SSL/TLS Certificate for openmainframe.net

Valid
Issued by (CA)
ZeroSSL GmbH
Subject
openmainframe.net
Valid from
Jun 26, 2026
Valid until
Sep 24, 2026 (66 days remaining)
Public key
EC 256-bit
Serial
7D7C99B8653D53D49BA9DF37FC5FC1F4
SHA-256 fingerprint
D5:FA:AB:85:87:EA:B7:9E:76:D8:6C:90:00:0A:47:16:66:A1:13:D6:CB:EE:E1:5C:E7:86:CD:9E:3A:2C:B2:95
Chain
ZeroSSL ECC DV SSL CA 2 → Sectigo Public Server Authentication Root E46
Subject Alternative Names (1)
openmainframe.net

Certificate Authority Authorization (CAA)

The serving CA (ZeroSSL GmbH) is authorized by this domain's CAA records (buypass.com, letsencrypt.org, sectigo.com, zerossl.com).