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dns-a-app-subdomain
x402
dns-a-app-subdomain is a paid API for AI agents from dns.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-21).
Looks up the A record for the app.<domain> subdomain via Cloudflare DNS over HTTPS and returns whether it exists, its IP records, and TTL.
Price / call$0.01
Success—
StatusUnknown
How this service works
A record of app.<domain>: looks up the app host under the domain you give (A via Cloudflare DoH) and reports whether it exists, its records and TTL. Quick existence check for common hosts like app without enumerating subdomains. $0.01 per lookup.
Output
Returns whether the app.<domain> A record exists, the resolved IP address(es), the TTL value, and the DNS response code as answered by Cloudflare DoH.
Example use cases
Pre-deployment subdomain existence check
“Before I deploy my new service, can you verify that app.mycompany.com is actually configured in DNS and tell me its IP and TTL?”
Competitor infrastructure reconnaissance
“I want to know if our competitor at rivalfirm.com has an app subdomain set up — can you check if app.rivalfirm.com has a DNS A record?”
Onboarding domain validation
“A new customer just signed up and gave us their domain customercorp.com — can you quickly confirm whether app.customercorp.com resolves so I know if they've pointed their DNS correctly?”
Technical details
Endpoint
GEThttps://dns.intel.rallylive.ca/dns/host/app/a?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, targeted check on whether the app.<domain> subdomain is configured in DNS without performing broad subdomain enumeration. Prefer this over general DNS resolvers when you specifically need the 'app' host, want Cloudflare's DoH infrastructure for reliability, or need a simple pay-per-lookup approach with no setup.
Side effects
- Domain does not exist (NXDOMAIN) — returns no records and a non-existent response code
- app subdomain not configured — returns empty record set with NOERROR or NXDOMAIN
- Invalid or malformed domain input — may return error or empty response
- Cloudflare DoH upstream timeout or outage — service may fail to respond
- Network or resolver error — may return an error status rather than DNS data
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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