25 lines
933 B
Markdown
25 lines
933 B
Markdown
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## RESTRICTION03: Character set restriction for label
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### Test case identifier
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**RESTRICTION03:** Character set restriction for label
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### Objective
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Even though section 11 of [RFC 2181](https://datatracker.ietf.org/doc/html/rfc2181) mentions
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that any binary string could be part of a label, many of the registries will
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not permit special symbols in the label. This is an habit pursued by the
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registries based on section 2.1 of the [RFC 1123](https://datatracker.ietf.org/doc/html/rfc1123),
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i.e. following the LDH (Letters, Digits and Hyphen) format. Even for the
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IDNs [RFC 5892](https://datatracker.ietf.org/doc/html/rfc5892) limits to the LDH
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format.
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The objective for this test is verify whether the engine identifies the
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domain names which is not in the LDH format.
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### Result
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The engine does not capture the restriction for LDH and the explanation is
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provided here : https://github.com/zonemaster/zonemaster/issues/153
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