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SiteCheck Web Intel NTP Port 123 Passive Scan Lookup
x402
SiteCheck Web Intel NTP Port 123 Passive Scan Lookup is a paid API for AI agents from api.webintel-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-24).
Checks Shodan's passive scan data to determine whether port 123 (NTP) has been observed open on a given IPv4 address
Price / call$0.002
Success—
StatusUnknown
How this service works
Reports whether Shodan's pre-collected passive scan data shows NTP (port 123) seen open on an IPv4 address. Passive and possibly old; the monlist amplification check itself is not run, so this cannot say whether monlist is enabled.
Output
Returns whether Shodan's pre-collected passive scan data shows port 123 (NTP) as having been observed open on the specified IPv4 address. Note: this reflects historical passive data and does not perform a live scan or test for monlist amplification vulnerability — only port visibility is reported.
Example use cases
NTP exposure audit for a server
“I want to know if Shodan has ever seen port 123 open on 198.51.100.42 — can you check whether NTP appears to be exposed on that IP?”
Security recon on a suspicious IP
“We flagged the IP 203.0.113.77 in our logs — can you pull Shodan's passive data to see if it's running NTP on port 123?”
Pre-pentest NTP surface mapping
“Before our engagement, check whether Shodan shows NTP port 123 as open on 192.0.2.15 so we know if it's in scope for NTP-based checks.”
Technical details
Endpoint
GEThttps://api.webintel-api.workers.dev/api/security/ntp-monlist-audit?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, passive check of whether NTP (port 123) is exposed on a given IPv4 address using Shodan's historical data, without triggering any active probe. Prefer this over active scanners when stealth or non-intrusiveness is required. Note: this cannot confirm whether monlist amplification is enabled — only that port 123 was observed open at some point in Shodan's data.
Side effects
- Invalid or malformed IPv4 address returns an error
- IPv6 addresses are not supported
- Shodan may have no data for the IP, returning no port observation
- Data may be stale if Shodan has not recently scanned the IP
- Private or RFC1918 addresses may return no results
- Rate limiting or payment failure may block the request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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