HTTPfy

Certum (Asseco) certificates on popular websites

Certum (Asseco) issued 43 of the 8,208 certificates we observed on popular sites in November 2026.

0.5%of observed certificates43 of 8,208

199 daysmedian validity period

14.0%expiring within 30 daysat scan time

100.0%validated for the host name

Validity period

Days between notBefore and notAfter of the leaf certificate.

up to 100 days 0.0%

101 to 200 days 60.5%

201 to 398 days 39.5%

over 398 days 0.0%

TLS versions negotiated

On sites using Certum (Asseco) (accent) and all sites (grey).

TLSv1.3 76.7%

all sites 84.9%

TLSv1.2 23.3%

all sites 15.1%

About Certum (Asseco)

Issuer organisation names seen in these certificates: Asseco Data Systems S.A. (43).

20.9% of the domains using Certum (Asseco) publish a CAA record (all sites: 20.7%). A CAA record names the CAs allowed to issue for the domain; any other CA must refuse.

CA site: https://www.certum.eu/

Popular sites with a Certum (Asseco) certificate

aparat.comdivar.irdigikala.commediaexpert.plhome.pltorob.comninisite.comeasytrader.irbale.aiwww.gov.pldns.comnazwa.pl

Check one yourself:

Check SSL certificate Look up CAA records HTTP headers

Source: our own scan of November 2026 (2026-11-11), 9,971 of the top 10,000 domains of the Tranco list Y895G that answered in DNS. Method and data.