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# IPv4 and IPv6

TIBCO FTL software supports both IPv4 and IPv6.

TIBCO FTL components accept either IPv4 and IPv6 addressing in the following cases:

- FTL server GUI fields configuring these transport parameters:
  - RUDP transport: Host field
  - Static TCP transport: Host field
  - Dynamic TCP transport: Subnet Mask field
- Arguments to client API calls that specify client connections to FTL servers
- Values that specify ports, either in FTL server configuration files, or in FTL server administration utility command line arguments

All other cases accept only IPv4 addressing.

## Notation

Specify IPv4 addresses in 4-part dot-decimal notation.

Specify IPv6 addresses in hexadecimal notation, with colon (`:`) separators, surrounded by square brackets. Square brackets must be present.

In situations where it is correct and meaningful to specify star (that is, asterisk, `*`) as a wildcard address, TIBCO FTL software interprets this wildcard as both an IPv4 wildcard and an IPv6 wildcard. (That is, it listens on all relevant interfaces in both protocols.)

You can specify the loopback address in IPv4 as either localhost or `127.0.0.1`, and in IPv6 as `[::1]` or an equivalent notation.

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TIBCO FTL® - Enterprise Edition

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