# is-port-631-open

> is-port-631-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 631 (IPP - Internet Printing Protocol) is open, closed, or filtered on a given host by attempting a connection from Cloudflare's edge network.

## Facts

- Endpoint: GET https://ip.intel.rallylive.ca/ip/port/631?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/is-port-631-open-344877e4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2qW0YXvmxrTKPE1tCqjQb

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability is-port-631-open-344877e4
```

Example prompt: Can you check whether TCP port 631 (IPP) is open or closed on the host printserver.mycompany.com, using an external probe so I don't have to run a scanner?

## When to prefer this

Use this endpoint when you need a quick, lightweight external check of whether port 631 (IPP) is exposed on a host without deploying your own scanner or network agent. Ideal for security audits, hardening verification, and exposure checks from an external vantage point. Note that results for Cloudflare-fronted hosts will be inconclusive — in those cases a direct scan from a different vantage point would be needed.

## Known failure modes

- Cloudflare-fronted hosts return inconclusive result because the edge answers for the origin
- Host does not exist or DNS resolution fails — likely returns an error
- Firewall silently drops packets — reported as filtered rather than closed
- Timeout if the host is extremely slow to respond
- Network-level blocking between Cloudflare edge and target may produce filtered instead of closed

## How this service works

Is TCP port 631 (IPP) 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 IPP without running a scanner. $0.01 per check.

## Output

Returns whether TCP port 631 is open, closed, or filtered on the target host as observed from Cloudflare's edge network, along with the TCP connect time. If the host is Cloudflare-fronted, the result is marked as inconclusive because Cloudflare's edge intercepts the connection on behalf of the origin.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/is-port-631-open-344877e4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ip.intel.rallylive.ca](https://www.zero.xyz/host/ip.intel.rallylive.ca/llms.txt)