Detect VPN, Proxy & Tor in Go

No dedicated call needed — the flags ride along with a normal LookupIP.

client := ipapi.NewClient(ipapi.WithAPIKey(os.Getenv("IP_API_IO_KEY")))
ctx := context.Background()

info, err := client.LookupIP(ctx, "185.220.101.1")
if err != nil {
	log.Fatal(err)
}
f := info.SuspiciousFactors

fmt.Println(f.IsVPN)         // VPN service
fmt.Println(f.IsProxy)       // open / anonymizing proxy
fmt.Println(f.IsTorNode)     // Tor node
fmt.Println(f.IsDatacenter)  // hosting / datacenter IP (often a bot)
fmt.Println(f.IsSpam)        // known spam source
fmt.Println(f.IsCrawler)     // known crawler / bot
fmt.Println(f.IsThreat)      // listed on a threat feed

if f.IsVPN || f.IsProxy || f.IsTorNode {
	// require step-up verification (CAPTCHA, 2FA)
}

A dedicated check against the live Tor node list, with a count of matching nodes.

tor, _ := client.TorCheck(ctx, "185.220.101.1")

fmt.Println(tor.IsTor)        // true
fmt.Println(tor.TorNodeCount) // number of matching Tor nodes