Computing
- Wildcard character, a character that substitutes for any other character or character range in regular expressions and globbing
- Wildcard DNS record, a record in a DNS zone file that will match all requests for non-existent domain names
- Wildcard Netmask, a netmask that swapping 1 to 0 and 0 to 1 from the normal netmask
- Wildcard certificate, a public key certificate with which you can secure multiple subdomains
- Wildcard (Java), a special actual type parameter for generic instantiations in Java
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