Looks up keys related to DNS entries like host name, canonical host name, host address.

The lookup keys are:

• name|address: for the host name, for example "name|93.184.216.34" -> "example.com".
• canonical-name|address: for the canonical host name, for example "name|93.184.216.34" -> "example.com".
• address|hostname: for the host address, for example "address|example.com" -> "93.184.216.34".
• address: same as address|hostname.

Using a StringLookup from the StringLookupFactory:

StringLookupFactory.INSTANCE.dnsStringLookup().lookup("address|apache.org");

Using a StringSubstitutor:

StringSubstitutor.createInterpolator().replace("... ${dns:address|apache.org} ..."));

The above examples convert "address|apache.org" to "95.216.24.32 (or "40.79.78.1").

Public access is through StringLookupFactory.