Übersicht & Anwendungsbereich
Der RFC 1035-Standard definiert die fundamentale Zuordnung von menschenlesbaren Hostnamen zu maschinenlesbaren Netzwerkadressen.
Spezifikationstabelle & Matrix
Echtzeit-Filter nach Stichwort, Statuscode oder Direktive
| Schlüssel / Code | Definition & Details | Semantische GEO-Hierarchie | Spezifikation & Hinweise |
|---|---|---|---|
| A | A (IPv4 Address) Maps a hostname to a 32-bit IPv4 address. example.com. 300 IN A 198.51.100.24 | ●A Record ↳DNS record ↳address mapping ↳IPv4 resolution | RFC 1035 §3.4.1 The foundational record of the internet; apex domains typically require A records. |
| AAAA | AAAA (IPv6 Address) Maps a hostname to a 128-bit IPv6 address ("quad-A"). example.com. 300 IN AAAA 2001:db8::8a2e:370:7334 | ●AAAA Record ↳DNS record ↳address mapping ↳IPv6 resolution | RFC 3596 §2.1 Essential for dual-stack modern web architectures and mobile networks. |
| CNAME | CNAME (Canonical Name) Maps an alias name to the true canonical domain name; causes DNS resolution to restart with the new name. www.example.com. 300 IN CNAME example.com. | ●CNAME Record ↳DNS record ↳alias pointer ↳canonical domain redirection | RFC 1035 §3.3.1 Cannot coexist with other records on the same node; forbidden at the root apex domain (RFC 1034). |
| MX | MX (Mail Exchange) Specifies the mail servers responsible for accepting incoming email for the domain, with integer priority. example.com. 3600 IN MX 10 mail.example.com. | ●MX Record ↳DNS record ↳email routing ↳mail server host priority | RFC 1035 §3.3.9 Lowest preference number is tried first (priority 10 is tried before priority 20). Target must be a hostname, not an IP. |
| TXT | TXT (Text Record) Holds arbitrary human or machine-readable text; ubiquitous for SPF, DKIM, DMARC, and domain ownership tokens. example.com. 300 IN TXT "v=spf1 include:_spf.google.com ~all" | ●TXT Record ↳DNS record ↳metadata string ↳domain security and identity verification | RFC 1035 §3.3.14 Individual text strings can be up to 255 bytes; longer strings are concatenated. |
| NS | NS (Name Server) Delegates a DNS zone to use specific authoritative nameservers. example.com. 86400 IN NS ns1.cloudflare.com. | ●NS Record ↳DNS record ↳zone delegation ↳authoritative nameserver authority | RFC 1035 §3.3.11 Configured at the domain registrar to route worldwide queries to your DNS hosting provider. |
| SOA | SOA (Start of Authority) Contains core administrative details about the zone: primary nameserver, admin email, serial, and negative cache TTL. example.com. IN SOA ns1.example.com. admin.example.com. 2026100501 7200 3600 1209600 3600 | ●SOA Record ↳DNS record ↳zone master info ↳zone sync and negative TTL | RFC 1035 §3.3.13 The final field defines the negative caching TTL for NXDOMAIN responses. |
| CAA | CAA (Certification Authority Authorization) Restricts which Certificate Authorities (CAs) are allowed to issue SSL/TLS certificates for the domain. example.com. 3600 IN CAA 0 issue "letsencrypt.org" | ●CAA Record ↳DNS record ↳PKI restriction ↳certificate authority issuance lock | RFC 6844 Prevents rogue or compromised CAs from issuing fraudulent certificates for your brand. |
| PTR | PTR (Pointer Record) Maps an IP address back to a hostname (Reverse DNS Lookup) inside the in-addr.arpa or ip6.arpa zones. 24.100.51.198.in-addr.arpa. 3600 IN PTR server1.example.com. | ●PTR Record ↳DNS record ↳reverse mapping ↳reverse DNS IP to host pointer | RFC 1035 §3.5 Critical for outbound mail delivery; spam filters reject emails from IPs lacking matching PTR records. |
| SRV | SRV (Service Record) Defines the hostname, port number, priority, and weight for specialized network services (SIP, XMPP, LDAP). _sip._tcp.example.com. 3600 IN SRV 10 60 5060 bigbox.example.com. | ●SRV Record ↳DNS record ↳service locator ↳port and protocol service discovery | RFC 2782 Format: _service._proto.name. TTL Class SRV Priority Weight Port Target. |
Querying Specific DNS Record Types with Dig
# Query IPv4 address
dig example.com A +short
# Query Mail Exchanger records with priority
dig example.com MX +noall +answer
# Query TXT records (SPF, DMARC)
dig example.com TXT +short
# Query CAA records to inspect authorized SSL issuers
dig example.com CAA +noall +answerUsing the dig command with explicit record types allows system administrators to verify DNS zone configuration directly.
Standard-Spezifikation Q&A
Why can I not put a CNAME at the root apex domain (example.com)?↓
What is the recommended TTL for production DNS records?↓
References & Primary Sources
Every source below directly substantiates technical statements and protocol behaviors explained in DNS-Records Referenz & Zonen-Übersicht. Curious-Techie prioritizes official Internet standards (IETF RFCs, W3C Recommendations, WHATWG specifications) and established security bodies (OWASP, NIST). Zero sponsored or secondary links.
- [1]IETFPrimary SpecificationRFC 1034 • Section 3 & 4Verified Primary SourceTechnical Claim Supported:
Establishes the hierarchical distributed domain name space, authoritative name servers, root zone topology, and zone delegations.
Source URI: https://datatracker.ietf.org/doc/html/rfc1034 - [2]IETFPrimary SpecificationRFC 1035 • Section 3.2 (Resource Records)Verified Primary SourceTechnical Claim Supported:
Defines standard DNS Resource Record wire structures (A, CNAME, MX, NS, PTR, SOA) and port 53 UDP/TCP protocol formats.
Source URI: https://datatracker.ietf.org/doc/html/rfc1035 - [3]IETFPrimary SpecificationRFC 8484 • Section 3 & 4Verified Primary SourceTechnical Claim Supported:
Standardizes encrypted DNS query transmission inside HTTP/2 and HTTP/3 HTTPS streams to prevent ISP eavesdropping and on-path manipulation.
Source URI: https://datatracker.ietf.org/doc/html/rfc8484
Zugehöriges technisches Ökosystem & nächste Schritte
Verwandte Entwickler-Werkzeuge
Verwandte Leitfäden
Verwandte Fachartikel
What Is the Domain Name System (DNS)?
Direct explanation of hierarchical domain resolution from root servers to zone files.
DNS vs DNS-over-HTTPS (DoH): Privacy & Security
Traditional UDP port 53 lookups compared to encrypted TLS-encapsulated DoH queries.
Troubleshooting: DNS Returns NXDOMAIN Error
Diagnose missing records, propagation lag, and nameserver delegation failures.
Verwandte technische Fragen
What Happens When a DNS TTL Expires?
Answer: When a DNS TTL expires, caching resolvers evict the record and must re-query the authoritative nameserver before responding to clients.
Can a CNAME Record Point to an IP Address?
Answer: No, RFC 1034 requires CNAME records to point exclusively to another domain name, never to raw IPv4 or IPv6 addresses.
Why Can't a CNAME Record Coexist With Other Records at the Zone Apex?
Answer: RFC 1034 requires that if a CNAME exists at a node, no other record data may exist there. Since a zone apex must have SOA and NS records, CNAME is prohibited.
Praxis-Diagnoselabore
Weiterlernen
DNS Resolution & Propagation Lab
Trace authoritative resolution from the root servers down to the zone file in the visual DNS workbench.