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dns-a-sip-subdomain
x402
dns-a-sip-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 2026-10-20).
Looks up the A record for the sip.<domain> subdomain via Cloudflare DoH and reports whether it exists, its IP records, and TTL.
Price / call$0.01
Success—
StatusUnknown
How this service works
A record of sip.<domain>: looks up the sip 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 sip without enumerating subdomains. $0.01 per lookup.
Output
Returns whether the sip.<domain> A record exists, the resolved IP address(es), and the TTL of the record. If the record does not exist, reports absence. Data is sourced via Cloudflare DNS over HTTPS.
Example use cases
VoIP infrastructure pre-check
“Before we onboard acmecorp.com as a SIP customer, can you check whether sip.acmecorp.com has a valid A record and what IP it points to?”
Troubleshoot missing SIP connectivity
“Our SIP calls to example.org are failing — can you look up the DNS A record for sip.example.org and tell me if it exists and what TTL it has?”
Domain SIP capability audit
“I'm evaluating vendors and need to know if startupco.io has a SIP host set up — can you check whether sip.startupco.io resolves in DNS?”
Technical details
Endpoint
GEThttps://dns.intel.rallylive.ca/dns/host/sip/a?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, targeted existence check for the sip.<domain> subdomain specifically, without enumerating all subdomains. Ideal for VoIP/SIP infrastructure validation, vendor due diligence, or troubleshooting SIP connectivity issues for a known domain.
Side effects
- Domain does not have a sip subdomain A record — returns non-existence result
- Invalid or malformed domain input — may return error or empty result
- Cloudflare DoH upstream timeout or error — lookup fails
- Domain input missing — required parameter not provided
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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