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Round-robin DNS gives one hostname multiple IP addresses and varies the order in which DNS answers return them. This can spread traffic across servers when clients tend to try the first address, but it does not guarantee even load distribution or remove an unhealthy server. It is a simple DNS-level technique, not a health-aware load balancer.
How round-robin DNS works
An administrator configures multiple A records for IPv4 addresses, multiple AAAA records for IPv6 addresses, or both, for the same hostname. The authoritative DNS server returns those addresses in a varying or permuted order across answers. RFC 9726 describes round-robin DNS as a common mechanism that returns DNS A or AAAA records in a permuted order: RFC 9726.
The intended effect relies on what happens after the lookup: historically, requesters have often tried the first address they receive. If different clients receive different orders, they may connect to different servers. The DNS server is not scheduling each connection; it is answering name lookups.
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- Multiple destinations: A hostname can resolve to several configured server addresses.
- Potential distribution: Varying answer order may spread connections if clients follow that order and use the first address.
- No guaranteed balance: DNS does not guarantee record ordering, and clients may reorder addresses. A resolver can also cache one answer and provide it to many clients, so the number of DNS answers does not correspond directly to each server’s share of connections or work. RFC 1794 states, “the DNS protocol doesn’t guarantee ordering”: RFC 1794.
- No built-in health check: Basic record rotation does not determine whether a server is healthy. If its address remains configured and is returned, clients may still try to connect to it.
Why DNS round robin is not automatic failover
Failover requires a system to detect an unhealthy target and stop directing new traffic to it. Plain round-robin DNS does not do that by itself. A failed server’s address can continue appearing in answers until the DNS configuration changes, and cached answers can persist after that change.
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Health-aware routing is a separate capability. For example, Cloudflare documents a distinction between unproxied DNS answers, which return configured A records for the client to choose among, and proxied traffic, where clients receive Cloudflare IP addresses and Cloudflare can select among configured origins. Its load-balancing service offers additional routing and failover capabilities: Cloudflare’s round-robin DNS documentation. Google Cloud DNS also documents health checks and failover as features of its routing policies: Google Cloud DNS routing policies. These are provider-specific behaviors, not properties of round-robin records generally.
How DNS caching affects changes and outages
DNS answers are cached according to their time to live (TTL). Changing or removing a record at the authoritative server therefore does not instantly replace copies already held by recursive resolvers or clients. Those clients may continue using a previously returned address until their cached information expires. Existing connections are not erased by a DNS change, either.
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A shorter TTL can limit how long an old answer is meant to remain cached, but it does not make every resolver or client refresh at the same moment, guarantee immediate failover, or control which address a client selects. RFC 1794 discusses TTL in relation to how quickly DNS information changes, while RFC 9726 describes cached answers persisting as DNS data changes.
When to use round-robin DNS—and what to compare
Round-robin DNS can be appropriate when a basic, low-complexity distribution of connections is useful and the service can tolerate uneven traffic or manual response to a failed target. If availability or controlled distribution matters, compare it with health-aware DNS routing or an application/network load balancer. Evaluate these characteristics:
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- Health handling: Does the system check targets and stop returning unhealthy ones?
- Traffic controls: Can you set weights or route by geography?
- Client answer: Does the client receive all configured addresses, or does a service select a destination?
- Selection point: Is a destination chosen when DNS is looked up, or by a proxy/load balancer when traffic arrives?
- Cache behavior: How do TTLs and cached answers affect changes and failover?
Capabilities and configuration limits depend on the provider and product. For instance, Google Cloud DNS documents external endpoint health-check intervals of 30 to 300 seconds; that range applies to its configuration, not to DNS generally.
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