My memory is fuzzy on valid DNS labels but I thought dashes were limited only in the beginning and end of a label.
$ ipa host-add test--4.example.com ipa: ERROR: invalid 'hostname': invalid domain-name: only letters, numbers , '-' are allowed. DNS label may not start or end with '-'
duplicate of #4710 and PKI https://fedorahosted.org/pki/ticket/1260
Metadata Update from @rcritten: - Issue assigned to mbasti - Issue set to the milestone: 0.0 NEEDS_TRIAGE
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