CRLs and OCSP use HTTP to retrieve information from the following servers. If you are a network administrator for your organization, make sure all computers in your network that might encounter a digital certificate issued by us can access these CRL and OCSP services.

Do not use the Destination IP information as this is subject to change.

Service	DNS Hostname(s)	Destination IPs	Port
OSCP	ocsp.sectigo.com	Info Changes	tcp/80
OSCP	ocsp.usertrust.com	Info Changes	tcp/80
OSCP	ocsp.comodoca.com	Info Changes	tcp/80

Service	DNS Hostname(s)	Destination IPs (subject to change)	Port
CRL	crl.sectigo.com	Info Changes	tcp/80
CRL	crl.usertrust.com	Info Changes	tcp/80
CRL	crl.comodoca.com	Info Changes	tcp/80

note: This table is subject to change over time as we expand our services.