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is-port-25-open
x402
is-port-25-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 25 (SMTP) 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 25 (SMTP) 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 SMTP without running a scanner. $0.01 per check.
Output
Returns whether TCP port 25 (SMTP) is open, closed, or filtered on the target host, along with the connection time in milliseconds. If the host is behind Cloudflare's edge network, the result is flagged as inconclusive because Cloudflare's infrastructure answers on behalf of the host.
Example use cases
Mail server exposure audit
“Check if port 25 is open on smtp.mycompany.com — I need to know whether our SMTP port is exposed to the internet before our security review.”
Deliverability troubleshooting
“Is port 25 open on mx1.clientdomain.com? We're having email delivery issues and I want to verify the SMTP port is actually reachable.”
New VPS email setup check
“I just set up a new mail server at 198.51.100.42 — can you check from outside if port 25 is open, closed, or filtered so I know if it's reachable?”
Technical details
Endpoint
GEThttps://ip.intel.rallylive.ca/ip/port/25?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, external vantage-point check of whether TCP port 25 (SMTP) is open on a host without deploying your own scanner. It is especially useful for security audits, mail server setup verification, and deliverability troubleshooting. Prefer this over generic port scanners when you want a lightweight, pay-per-check approach from Cloudflare's edge network.
Side effects
- Host behind Cloudflare returns inconclusive result — Cloudflare's edge intercepts the connection
- Invalid or unresolvable hostname returns an error
- Timeout may cause filtered vs closed ambiguity
- Rate limiting or payment failure returns a 402 or error response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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