gov.uk:443

Checked 5/15/2026, 12:03:59 AM · 99ms

A+

Excellent: TLS 1.3, valid cert, HSTS preload set.

Certificate

227d until expiry

Subject: CN=www.gov.uk, O=Government Digital Service, L=London, ST=Greater London, C=GB
Issuer: CN=GlobalSign RSA OV SSL CA 2018, O=GlobalSign nv-sa, C=BE
Valid from: Nov 26, 2025
Valid until: Dec 28, 2026
Self-signed: No
Hostname match: Yes
Trusted chain: Yes
Serial: 4247D6D08E7F58C125B85716

Subject Alternative Names (13)

www.gov.uk
*.businesslink.gov.uk
*.direct.gov.uk
*.publishing.service.gov.uk
*.cabinet-office.gov.uk
assets.digital.cabinet-office.gov.uk
service.gov.uk
data.gov.uk
dfid.gov.uk
cabinet-office.gov.uk
api.gov.uk
www.data.gov.uk
gov.uk

Certificate chain (3)

Leafexpires Dec 28, 2026
CN=www.gov.uk, O=Government Digital Service, L=London, ST=Greater London, C=GB
issued by CN=GlobalSign RSA OV SSL CA 2018, O=GlobalSign nv-sa, C=BE
Intermediateexpires Nov 21, 2028
CN=GlobalSign RSA OV SSL CA 2018, O=GlobalSign nv-sa, C=BE
issued by CN=GlobalSign, O=GlobalSign, OU=GlobalSign Root CA - R3
Rootexpires Mar 18, 2029
CN=GlobalSign, O=GlobalSign, OU=GlobalSign Root CA - R3
issued by CN=GlobalSign, O=GlobalSign, OU=GlobalSign Root CA - R3

Protocol support

Negotiated: TLSv1.3 · TLS_AES_128_GCM_SHA256 (TLSv1.3)

TLSv1
Not supported
not supported
TLSv1.1
Not supported
not supported
TLSv1.2
Supported
TLSv1.3
Supported

HSTS

Max-age: 1.0 years (31536000s)
includeSubDomains: No
preload: Yes
Raw header: max-age=31536000; preload

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