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is-port-53-open
x402
is-port-53-open is a paid API for AI agents from ip.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-13).
Checks whether TCP port 53 (DNS) is open, closed, or filtered on a given host by attempting a connection from Cloudflare's edge network.
Price / call$0.01
Success—
StatusUnknown
How this service works
Is TCP port 53 (DNS) open on a host? Attempts a connection from Cloudflare's edge and reports open/closed/filtered with the connect time; Cloudflare-fronted hosts are reported as inconclusive because their edge answers for them. Exposure checks for DNS without running a scanner. $0.01 per check.
Output
Returns the port status (open, closed, or filtered) for TCP port 53 on the target host, the connection time in milliseconds, and a flag indicating if the result is inconclusive because the host is fronted by Cloudflare's edge (which answers on the host's behalf).
Example use cases
DNS exposure audit on new server
“We just provisioned a new server at 198.51.100.10 — can you check if port 53 is open on it? I want to make sure we're not accidentally exposing a DNS listener to the public internet.”
Security check before onboarding a vendor IP
“Before we allowlist this vendor's IP 203.0.113.77, can you verify whether TCP port 53 is open on it? I need to know if they're running an exposed DNS service.”
Incident response DNS reachability check
“We're seeing weird DNS traffic from a client host at 192.0.2.55 — can you quickly check if port 53 is open or filtered on that IP from an external perspective?”
Technical details
Endpoint
GEThttps://ip.intel.rallylive.ca/ip/port/53?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, external-perspective check of whether TCP port 53 (DNS) is reachable on a specific host without deploying your own scanner. It is particularly useful for security audits, infrastructure validation, and incident response where you want to detect DNS exposure from the public internet. Prefer this over general port scanners when you specifically need DNS port visibility with Cloudflare-edge sourcing and a known per-check cost.
Side effects
- Cloudflare-fronted hosts return inconclusive result because Cloudflare's edge terminates connections
- Host or IP unreachable results in filtered/closed status which may be ambiguous
- Invalid or non-resolvable hostname causes request failure
- Rate limiting or payment failure returns error without port status
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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