DNS CAA Policy Builder
Select certificate authorities and an optional reporting email to generate local issue, issuewild and iodef DNS record text.
About this dns caa policy builder
Select certificate authorities and an optional reporting email to generate local issue, issuewild and iodef DNS record text Performs protocol inspection, IP calculation, and network analysis client-side without sending probes or exposing network topology.
Protocol mechanics & network logic
Enter the DNS owner, select at least one CA option and choose a wildcard policy. Add an optional reporting email, choose flags 0 or 128, then generate issue/issuewild/iodef lines.
Worked network diagnostic scenario
Scenario: Generate one RFC 8659 issue record for example.com without publishing DNS changes.
Sample input:
Processing: Validate the owner, tag, flags and CA issuer domain, then return one record and its parsed fields. Example: select Let’s Encrypt and DigiCert, same wildcard issuers and security@example.com. Generate five lines: two issue, two issuewild and one iodef; flags 0.
Illustrative output:
Addressing limits & protocol boundaries
Bounded ASCII input: owner @ or a domain (no wildcard owner), at most 256 input characters; email at most 254 characters and 64 before @, ordinary unquoted address only. Three CA options; at most 11 records. Flags are 0 or 128. No DNS queries or unlimited policy imports.
Addressing calculations and subnet models in DNS CAA Policy Builder follow IETF RFC definitions. Ensure subnet masks and CIDR prefixes match your network topology.
Offline network inspection boundary
Address parsing and CIDR calculations in DNS CAA Policy Builder run entirely client-side without probing external IP networks or transmitting routing data.
IETF RFC specifications & IANA registries
IETF Request for Comments (RFC) standards and IANA registry references:
- RFC 1035 (Domain Names - Implementation and Specification)
- RFC 8659 (DNS Certification Authority Authorization - CAA)
DNS CAA Policy Builder verification · Audit standards
How to use it
- Enter, paste, or select your input data into the DNS CAA Policy Builder workspace controls.
- Review parameter fields, units, or options configured for DNS CAA Policy Builder.
- Flags are 0 or 128.
DNS CAA Records (RFC 6844, RFC 8659): Mitigating Rogue SSL/TLS Certificates and PKI Risks →
A comprehensive security engineering guide to DNS Certification Authority Authorization (CAA), issue and issuewild tags, incident reporting (iodef), and DNSSEC trust anchoring.
Frequently asked questions
How does the engine of DNS CAA Record Generator compute its results deterministically?+
Formats one RFC 8659 CAA record per run from owner, flags, tag and value; it does not create three records automatically.
How should input values be structured before running DNS CAA Record Generator?+
Enter JSON such as {"domain":"example.com","issuer":"letsencrypt.org","tag":"issue","flags":0}. The output contains one record, example.com IN CAA 0 issue "letsencrypt.org", and parsed fields.
What diagnostics are displayed by DNS CAA Record Generator upon encountering format violations?+
Invalid owner domains, tags, CA domains and iodef URLs are rejected. Under RFC 8659, flags may be 0 or 128 only; other reserved bits are rejected. For iodef, supply a mailto, HTTP or HTTPS URL in issuer. Flags are 0 or 128. Without issuewild, issue also governs wildcard requests. Explicit issuewild entries override issue for wildcard requests; issuewild ";" denies wildcard issuance in this generated set. An existing broader DNS set can change the effective policy.
Does DNS CAA Record Generator operate entirely offline within client-side browser memory?+
The function formats local text only and does not publish DNS records. A generated record has not been checked against a live zone or CA decision. CAA limits compliant CA issuance, not all attacks or existing certificates. Check the relevant DNS RRset, aliases, inherited policy and CA requirements before publishing. iodef advertises a report destination but does not guarantee alerts. Generation and copying stay in this browser. No email is sent; no DNS record is published. Cloudflare uses partner CAs, not a cloudflare.com issuer. This dated selection (2026-10-03) expands to letsencrypt.org, pki.goog, ssl.com and sectigo.com and removes duplicates. It is not exhaustive or an automatic recommendation; review current Cloudflare requirements. No CA-specific parameters are generated.