get_bgp_pfx2as

Get prefix-to-ASN mapping. Useful for looking up which AS announces a given IP prefix.

SERVERCloudflare SOURCEhttps://builds.mcp.cloudflare.com/sse

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade D, identity verified Pull the record →

This record as markdown: /tools/cloudflare/get-bgp-pfx2as.md

WHAT IT DOES

What get_bgp_pfx2as does on Cloudflare

AI agents call get_bgp_pfx2as to retrieve information from Cloudflare without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why get_bgp_pfx2as is rated Low

This tool retrieves BGP prefix-to-ASN mapping information from a read-only query. It performs a lookup of which autonomous system announces a given IP prefix—a passive information retrieval operation with no capability to modify, delete, execute code, or commit financial transactions. The blast radius of misuse is minimal, limited to information disclosure about network routing topology.

From the tool's definition Tool name 'get_bgp_pfx2as' and description 'Get prefix-to-ASN mapping' indicate a query/lookup operation. The verb 'Get' and phrase 'looking up' confirm data retrieval with no side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs get_bgp_pfx2as safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Cloudflare, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For get_bgp_pfx2as, this is the rule to start with:

get_bgp_pfx2as Allowed

get_bgp_pfx2as is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_bgp_pfx2as": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Cloudflare, apply this rule, and every get_bgp_pfx2as call is checked against it from then on.

FAQ

Questions about get_bgp_pfx2as

What does the get_bgp_pfx2as tool do? +

Get prefix-to-ASN mapping. Useful for looking up which AS announces a given IP prefix. It is categorised as a Read tool in the Cloudflare MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_bgp_pfx2as? +

Register the Cloudflare MCP server in PolicyLayer and add a rule for get_bgp_pfx2as: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Cloudflare. Nothing to install.

What risk level is get_bgp_pfx2as? +

get_bgp_pfx2as is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_bgp_pfx2as? +

Yes. Add a rate_limit block to the get_bgp_pfx2as rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block get_bgp_pfx2as completely? +

Set action: deny in the PolicyLayer policy for get_bgp_pfx2as. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides get_bgp_pfx2as? +

get_bgp_pfx2as is provided by the Cloudflare MCP server (https://builds.mcp.cloudflare.com/sse). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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