SSL Certificate Types and Purposes

SSL certificates are used to secure communications between a website, host or server, and end users that are connecting to that server. An SSL certificate confirms the identity of the domain name that is operating the web site, encrypts all information between the server and the visitor and ensures the integrity of the transmitted information.

There are several types of SSL certificates that we can issue using the InCommon certificate service.  A brief description of the types of SSL certificates offered, their typical purpose, and limitations follows:

Certificate Type

Description and Purpose

Available Validity

Typical Processing Time

Single domain (Incommon SSL Certificate)

An SSL certificate protects a single domain e.g.  These are the "traditional" SSL certificates that have been in use since the advent of the SSL protocol.

1 year

1 -2 business days

Multiple domain (Incommon Multi-domain SSL certificate)

A multiple domain certificate allows you protect multiple host names with a single SSL certificate.  These are also known as SAN (Subject Alternative Name) certificates.   Up to 100 domain names can be included in a multi-domain certificate. However, if applying for a certificate with more than 20 SANs, please contact so that we can assist you in this request. 

These certificates are often used on a single servers hosting many web sites to eliminate the need to use unique ip addresses for each web site e.g. and

1 year

1-2 business days

Extended validation single domain (Comodo EV SSL certificate)

An Extended Validation certificate protects a single domain e.g.  However, the certificate is issued according to a specific set of identity verification criteria. Certificates issued by a CA under the EV guidelines are not structurally different from other certificates but are designated with a CA-specific policy identifier so that EV-aware software (browsers) can recognize them and display the "green bar".

We recommend using these certificates for sites where a user will be entering login credentials or financial related sites. 

Because Comodo has to do additional identity verification for each of these requests, certificates processing time is significantly increased.  Please plan ahead!

1 year

5-10 business days

Extended validation multiple domain (Comodo EV multi-domain SSL certificate)

See above, except this certificate can protect multiple domains. 

1 year

5-10 business days

Wildcard (Incommon wildcard SSL certificate)

A wildcard certificate protects a domain and unlimited subdomains of that domain e.g * secures,, etc.  Because of the increased risk of using wildcard certificates, we require an the requestor agree to certain terms of service and suggest using multi-domain certificates rather than wildcard certificates when possible.

1 year

2--3 business days

UCC Exchange (Incommon Unified Communications Certificate)

  A unified communications certificate allows you to protect multiple host names with a single SSL certificate.  Specifically designed for Microsoft Exchange and Microsoft Office Communciations Server.  Newer versions of Microsoft products will work with multi-domain certificates.

1 year

1-2 business days