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2.2.1 DHCPv4 Option Code 12 (0xC) - Host Name Option

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This option, as defined in [RFC2132] section 3.14, specifies the name of the client that MUST follow character set restrictions as specified in [RFC1035]. [RFC1035] section 2.3.1 specifies a "preferred" name syntax that uses letters, digits, and hyphens, but does not state whether this is mandatory (for more information, see [MS-HNDS]). In addition, [RFC1035] does not explain how to ASCII-encode a name if the client has a non-ASCII name, and hence the contents of this option are implementation-specific.<1> It was this ambiguity that led to it being rendered obsolete by DHCPv4 Option Code 81 (section 2.2.7).