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is-port-143-open
x402
is-port-143-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 143 (IMAP) 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 143 (IMAP) 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 IMAP without running a scanner. $0.01 per check.
Output
Returns whether TCP port 143 is open, closed, or filtered on the target host, along with the connection time in milliseconds. If the host is fronted by Cloudflare's edge network, the result is reported as inconclusive since Cloudflare answers on behalf of the origin.
Example use cases
IMAP exposure audit for mail server
“Is port 143 open on mail.mycompany.com? I want to know if our IMAP service is accidentally exposed to the internet.”
Verify IMAP before email client setup
“Check whether port 143 is open on imap.fastmail.com so I can confirm IMAP is reachable before configuring my email client.”
Security check on newly deployed VPS
“Can you probe TCP port 143 on 198.51.100.42 and tell me if IMAP is open, closed, or filtered? I just set up the server and want to make sure nothing unexpected is exposed.”
Technical details
Endpoint
GEThttps://ip.intel.rallylive.ca/ip/port/143?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, passive check of IMAP port 143 reachability on a host without deploying a local port scanner or network tool. It is ideal for security audits, pre-deployment checks, or validating mail server configuration from an external vantage point. Prefer it over general-purpose port checkers when you specifically need IMAP exposure results via Cloudflare's edge with built-in Cloudflare-fronting detection.
Side effects
- Host is Cloudflare-fronted: result reported as inconclusive because Cloudflare's edge intercepts the connection
- Invalid hostname or IP: request may fail or return an error
- Timeout/filtered: port appears closed or filtered if a firewall drops packets silently
- Network unreachable target: connection attempt times out with no result
- Payment failure: $0.01 USDC x402 payment required; missing or invalid payment returns 402 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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