Compare DNS Resolvers
Compare DNS responses across 12 major public resolvers.
GET
/v1/compare-resolvers
curl "https://dns.toolkitapi.io/v1/compare-resolvers?domain=github.com&type=A"
import httpx
resp = httpx.get(
"https://dns.toolkitapi.io/v1/compare-resolvers?domain=github.com&type=A",
)
print(resp.json())const resp = await fetch("https://dns.toolkitapi.io/v1/compare-resolvers?domain=github.com&type=A", {
});
const data = await resp.json();
console.log(data);# See curl example
Response
200 OK
{
"domain": "github.com",
"record_type": "A",
"resolvers_queried": 12,
"consensus": true,
"unique_answers": 1,
"fastest_resolver": "Cloudflare (1.1.1.1)",
"fastest_time_ms": 7.2,
"results": [
{"resolver_ip": "8.8.8.8", "provider": "Google", "name": "Google Public DNS", "records": ["140.82.121.3"], "ttl": 60, "response_time_ms": 14.3, "status": "ok", "error": null},
{"resolver_ip": "1.1.1.1", "provider": "Cloudflare", "name": "Cloudflare DNS", "records": ["140.82.121.3"], "ttl": 60, "response_time_ms": 7.2, "status": "ok", "error": null}
],
"query_time_ms": 21.5
}Try It Live
Live Demo
Response
Description
Compare DNS responses across 12 major public resolvers.
How to Use
1
1. Set the `domain` parameter to the domain you want to test.
2
2. Optionally set `type` for the record type (default: A).
3
3. Check `consensus` — if `false`, investigate which resolvers disagree and why.
About This Tool
Compare DNS Resolvers queries a domain across 12 major public DNS resolvers — Google, Cloudflare, Quad9, OpenDNS, Control D, and AdGuard — and compares their responses, TTLs, and latency. It detects DNS poisoning, censorship, or inconsistent responses across providers.
The `consensus` field tells you whether all resolvers agree on the same answer. If they don't, `unique_answers` shows how many different responses exist.
Why Use This Tool
- DNS poisoning detection — Identify resolvers returning different IPs (potential MITM)
- Censorship detection — Check if certain resolvers block or redirect your domain
- Performance comparison — Find the fastest resolver for your domain
- Troubleshooting — Explain why users on different networks see different sites
Frequently Asked Questions
Which resolvers are compared?
Google (8.8.8.8, 8.8.4.4), Cloudflare (1.1.1.1, 1.0.0.1), Quad9 (9.9.9.9), OpenDNS (208.67.222.222, 208.67.220.220), Control D, and AdGuard — 12 resolvers total.
What does consensus: false mean?
It means at least one resolver returned a different answer. This could indicate DNS poisoning, geo-based load balancing, or resolver-level filtering.
What record types are supported?
A, AAAA, CNAME, MX, NS, and TXT.
Start using Compare DNS Resolvers now
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