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is-port-512-open
x402
is-port-512-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 512 (rexec) 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 512 (rexec) 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 rexec without running a scanner. $0.01 per check.
Output
Returns whether TCP port 512 is open, closed, or filtered on the target host, along with the connection time in milliseconds. If the host is Cloudflare-fronted, the result is reported as inconclusive since Cloudflare's edge answers on behalf of the origin.
Example use cases
Security audit for rexec exposure
“I need to know if port 512 is open on my production server at api.mycompany.com — can you check whether rexec is accessible from the internet?”
Pre-deployment firewall verification
“We're about to go live with our new VPS at 198.51.100.12 — can you confirm port 512 is closed or filtered so rexec isn't accidentally exposed?”
Third-party vendor risk check
“I'm evaluating a vendor whose API server is at vendor.example.net — can you check if TCP port 512 is open on it? I want to know if they have rexec exposed before we connect.”
Technical details
Endpoint
GEThttps://ip.intel.rallylive.ca/ip/port/512?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, lightweight external check for rexec (port 512) exposure on a specific host without deploying your own scanner. It is ideal for security audits, firewall validation, and vendor risk assessments where you want an outside-in perspective on port reachability. Note the Cloudflare-fronted caveat: results for CDN-protected hosts will be inconclusive.
Side effects
- Host is Cloudflare-fronted: result returned as inconclusive rather than open/closed/filtered
- Invalid or unresolvable hostname: lookup fails with an error
- Network timeout: connection attempt times out, may be reported as filtered
- Host actively refuses connection: reported as closed
- Firewall silently drops packets: may be reported as filtered after timeout delay
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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