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is-port-873-open
x402
is-port-873-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 2026-10-12).
Checks whether TCP port 873 (rsync) 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 873 (rsync) 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 rsync without running a scanner. $0.01 per check.
Output
Returns the status of TCP port 873 on the target host: open, closed, or filtered, along with the connection time in milliseconds. If the host is Cloudflare-fronted, the result is marked as inconclusive because Cloudflare's edge answers on behalf of the origin.
Example use cases
Rsync exposure audit before deployment
“Before I deploy this server, check if port 873 is open on 198.51.100.10 — I need to make sure rsync isn't accidentally exposed to the internet.”
Security sweep of a client's server
“Run a quick check on port 873 for my client's server at storage.example.com — I want to know if rsync is reachable and how long the connection takes.”
Incident response rsync exposure check
“We got a tip that one of our servers might have rsync exposed — can you check if TCP port 873 is open or filtered on 192.0.2.55?”
Technical details
Endpoint
GEThttps://ip.intel.rallylive.ca/ip/port/873?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a lightweight, no-scanner check on whether rsync (TCP port 873) is publicly reachable on a specific host, especially for security audits, compliance checks, or pre-deployment exposure verification. It is preferable to full port scanners when you only need to check this specific port quickly and cheaply at $0.01 per call.
Side effects
- Cloudflare-fronted hosts return inconclusive result because Cloudflare's edge intercepts the connection
- Host is unreachable or DNS does not resolve, returning an error or filtered status
- Network-level firewalls may cause filtered status even when the service is running
- Rate limiting or payment failure may prevent the check from completing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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