Wildcard SSL certificates allow you to secure multiple sub-domains of a single domain instead of requiring a separate certificate for each one.

These certificates are issued for *.yourdomainname.co.uk and can be used in the following ways:

It will produce a yellow lock on the address bar to show users that their data is being encrypted and kept private.

SSL Certificate Name
 
SSL Brand
 
Warranty
 
Validation Type
 
Price
From*
Comodo Positive Wildcard Secures multiple subdomains of a single domain (Includes www. version of domain as well)
Available for 1 & 2 years
Comodo $10,000.00 Domain £62.73 More Info
Comodo Essential Wildcard Secures multiple subdomains of a single domain (Includes www. version of domain as well)
Available for 1 & 2 years
Comodo $10,000.00 Domain £69.48 More Info
RapidSSL Wildcard Secures multiple subdomains of a single domain (Includes www. version of domain as well)
Available for 1 & 2 years
RapidSSL $5,000.00 Domain £79.48 More Info
Comodo Premium Wildcard Secures multiple subdomains of a single domain (Includes www. version of domain as well)
Available for 1 & 2 years
Comodo $250,000.00 Business £109.48 More Info
Comodo PositiveSSL Multi-Domain Wildcard (2 SAN) Secures multiple subdomains of a single domain (Includes www. version of domain as well)
Available for 1 & 2 years
Comodo $10,000.00 Domain £127.73 More Info
Comodo PositiveSSL Multi-Domain Wildcard (3 SAN) Secures multiple subdomains of a single domain (Includes www. version of domain as well)
Available for 1 & 2 years
Comodo $10,000.00 Domain £153.98 More Info
GeoTrust True BusinessID Wildcard Secures multiple subdomains of a single domain
Available for 1 & 2 years
GeoTrust $10,000.00 Business £273.73 More Info