SecureBlackbox fully supports IPv6 network addressing scheme. The transport classes (SSL / TLS, FTP, HTTP, SMTP, POP3, IMAP, WebDAV, LDAP, SSH, SFTP, AS2 and AS3, Cloud) can be used in IPv6 networks without any problems, address conversions or packet wrapping. In particular FTP/FTPS classes support IPv6 extension commands (EPSV, EPRT).
Certificate validation for SSL/TLS also takes care about IPv6 addresses in X.509 certificates.
To enable IPv6 addressing in socket-based classes you should set UseIPv6 property to true. Note, that IPv6 is not supported on some platforms. When it's not supported, the corresponding property is not available.