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is-port-515-open
x402
is-port-515-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 515 (LPD/Line Printer Daemon) is open, closed, or filtered on a given host, reporting connect time from Cloudflare's edge.
Price / call$0.01
Success—
StatusUnknown
How this service works
Is TCP port 515 (LPD) 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 LPD without running a scanner. $0.01 per check.
Output
Returns whether TCP port 515 is open, closed, or filtered on the target host as seen from Cloudflare's edge network, along with the connection time in milliseconds. If the host is Cloudflare-fronted, the result is marked inconclusive since Cloudflare's edge answers on behalf of the origin.
Example use cases
LPD exposure audit on production server
“Check if port 515 is open on my production server at 198.51.100.10 — I need to know if the LPD port is accidentally exposed to the internet.”
Security sweep for legacy print ports
“Is TCP port 515 open or filtered on the host printserver.example.com? I'm auditing for legacy print daemon exposure.”
Verifying port closure after firewall change
“After applying our new firewall rules, can you confirm that port 515 is now closed on 192.0.2.88? I want to make sure LPD is no longer reachable.”
Technical details
Endpoint
GEThttps://ip.intel.rallylive.ca/ip/port/515?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, passive LPD port exposure check from an external vantage point without deploying your own network scanner. It is ideal for security audits, compliance checks, or post-firewall-change verification where you want a third-party perspective on port 515 reachability. Prefer alternatives if you need comprehensive port range scanning or need to test ports on Cloudflare-fronted infrastructure where results will be inconclusive.
Side effects
- Cloudflare-fronted hosts return inconclusive status because Cloudflare's edge intercepts the connection
- Firewalled hosts may appear filtered rather than closed, making the distinction ambiguous
- Hosts behind NAT or reverse proxies may not reflect true port exposure
- Network timeouts may cause false filtered results for slow-responding hosts
- Invalid or unresolvable hostnames will result in an error response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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