[Home](./index.md) > [bitburner](./bitburner.md) > [NS](./bitburner.ns.md) > [dnsLookup](./bitburner.ns.dnslookup.md) ## NS.dnsLookup() method Given a hostname, returns its IP address; or given an IP address, returns its hostname. **Signature:** ```typescript dnsLookup(host?: string): string; ``` ## Parameters

Parameter	Type	Description
host	string	_(Optional)_ Hostname/IP of the target server. Optional. Defaults to current server if not provided.

**Returns:** string ## Remarks RAM cost: 0.05 GB