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Measure DNS resolution speed across multiple resolvers and locations. Identify latency bottlenecks that slow down your website and applications.
A DNS speed test measures the round-trip time for DNS queries to resolve your domain name to an IP address. Every time a user visits your website, their browser must perform at least one DNS lookup before it can request any content. Slow DNS resolution directly translates to slower page loads, higher bounce rates, and worse SEO rankings. This tool tests multiple resolvers to identify where delays occur and which resolvers offer the best performance.
DNS is the first step in every web request. A 200ms DNS delay means every visitor waits 200ms before your server is even contacted. For e-commerce sites, this directly impacts conversion rates and revenue.
Ignoring DNS performance in speed optimization, assuming all resolvers are equal, not testing from the target audience's geographic location, and not re-testing after DNS infrastructure changes.
Type the domain to measure DNS resolution speed for.
We send DNS queries from multiple resolvers and locations.
Round-trip time is measured with high-precision timing.
See latency by resolver, location, and record type.
Tests DNS resolution speed across Google DNS, Cloudflare, Quad9, OpenDNS, and your ISP resolver simultaneously. See which resolver delivers the lowest latency for your domain.
Measures resolution time from multiple global locations. Understand how DNS latency affects users in North America, Europe, Asia, and other regions differently.
Tests speed for A, AAAA, MX, TXT, and NS records separately. Different record types may have different cache states and routing paths affecting resolution time.
Shows p50, p90, and p99 latency percentiles across test runs. Understand typical user experience versus worst-case scenarios for DNS resolution.
Identifies resolvers that fail to respond or exceed timeout thresholds. A resolver that times out is worse than one that's merely slow — it breaks functionality.
Assigns a performance grade (A-F) based on average response time, consistency, and timeout rate. Quick at-a-glance assessment of your DNS performance health.
Automate DNS speed tests, track latency trends over time, detect performance degradation, and get alerts when resolution times exceed thresholds.