0
DNS
0 NOERROR
No error condition. The query completed successfully and the response contains the requested data.
On this page
When You See This Code
This is the normal, successful response to any DNS query — the name was resolved and the answer section contains the requested records.
How to Fix
No fix needed. RCODE 0 means the DNS lookup succeeded as expected.
Specification
Comparisons
Compare With
Guides
HTTP Request Lifecycle: From URL to Response
HTTP Fundamentals
Step-by-Step DNS Troubleshooting with dig and nslookup
Debugging & Troubleshooting
Improving Email Deliverability: SPF, DKIM, and DMARC Setup
Email Delivery
DNS Response Codes (RCODEs) Explained
DNS & Networking
DNS TTL: How to Set TTL Values and Avoid Propagation Delays
DNS & Networking
DNS Propagation: Why Changes Take Time
DNS & Networking
DNSSEC Implementation Guide
DNS & Networking
DNS-Based Failover and High Availability
DNS & Networking
DNS Record Types Explained: A, AAAA, CNAME, MX, TXT, and Beyond
DNS & Networking
DNS over HTTPS (DoH) and DNS over TLS (DoT): Encrypted DNS Explained
DNS & Networking
Essential Network Debugging Tools: ping, traceroute, mtr, and tcpdump
DNS & Networking
Resource Hints: Preload, Prefetch, Preconnect, and DNS-Prefetch
Performance & Optimization
RFC 9114: HTTP/3 Protocol Deep Dive
Protocol Deep Dives
RFC 3261: SIP Protocol Deep Dive
Protocol Deep Dives
QUIC Protocol: The Transport Layer Behind HTTP/3
Protocol Deep Dives
Migrating from TLS 1.2 to TLS 1.3: Configuration and Compatibility
Migration & Upgrades
Secret Management for API Keys, Tokens, and Certificates
Production Infrastructure
Specifications
Decision Guides
Glossary
TCP/IP
Port Number
Latency
Timeout
Firewall
DNS over HTTPS (DoH)
IPv6
Subnet (Subnetwork)
MTU (Maximum Transmission Unit)
UDP (User Datagram Protocol)
DNS Lookup
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RFC (Request for Comments)
IANA (Internet Assigned Numbers Authority)
Wire Format
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Connectionless
Text vs Binary Protocol
DNS Resolution
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EDNS(0)
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Split-Horizon DNS
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SPF, DKIM, and DMARC
Email Deliverability
MTA (Mail Transfer Agent)
ARC (Authenticated Received Chain)
BIMI (Brand Indicators for Message Identification)
Service Discovery
GSLB (Global Server Load Balancing)
Failover
Active-Passive HA
Frequently Asked Questions
What is DNS 0 NOERROR?
No error condition. The query completed successfully and the response contains the requested data.
When do you see DNS 0 NOERROR?
This is the normal, successful response to any DNS query — the name was resolved and the answer section contains the requested records.
How to fix DNS 0 NOERROR?
No fix needed. RCODE 0 means the DNS lookup succeeded as expected.