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https://www.nslookup.io/dlv-lookup/
DLV Lookup – DNSSEC Lookaside Validation Checker
Find DNSSEC lookaside validations (DLV DNS records) for any domain or website. Check if the DLV records have been configured correctly.
dnssec lookaside validationdlvlookupchecker
https://www.rfc-editor.org/rfc/rfc5074.html
RFC 5074: DNSSEC Lookaside Validation (DLV)
dnssec lookaside validationrfc5074dlv
https://mailarchive.ietf.org/arch/msg/ietf-announce/lijeNVjkekVJNawP_QfoOJAxqrU/
Last Call: Moving DNSSEC Lookaside Validation (DLV) to Historic Status
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dnssec lookaside validationlast callhistoric statusmovingdlv