WHOIS lookup by ASN.
AI agents call whois_lookup_by_asn to retrieve information from IPInfo MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
WHOIS lookups retrieve publicly available network registration information indexed by Autonomous System Number (ASN). This is a read-only, informational query with no capability to modify, delete, or execute code. The operation is non-destructive and produces no side effects beyond data retrieval.
From the tool's definition Tool name contains 'lookup' and description states 'WHOIS lookup by ASN' — both indicate a retrieval operation.
Attacks that exploit this kind of access
WHOIS lookup by ASN. It is categorised as a Read tool in the IPInfo MCP Server MCP Server, which means it retrieves data without modifying state.
Register the IPInfo MCP Server MCP server in PolicyLayer and add a rule for whois_lookup_by_asn: 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 IPInfo MCP Server. Nothing to install.
whois_lookup_by_asn is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the whois_lookup_by_asn 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.
Set action: deny in the PolicyLayer policy for whois_lookup_by_asn. 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.
whois_lookup_by_asn is provided by the IPInfo MCP Server MCP server (nimblebraininc/mcp-ipinfo). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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