diff --git a/network.go b/network.go
index 347f695..8b39723 100644
--- a/network.go
+++ b/network.go
@@ -15,7 +15,24 @@ var (
 
 // GetIP returns IP address from request.
 func (limiter *Limiter) GetIP(r *http.Request) net.IP {
-	if limiter.Options.TrustForwardHeader {
+	return GetIP(r, limiter.Options)
+}
+
+// GetIPWithMask returns IP address from request by applying a mask.
+func (limiter *Limiter) GetIPWithMask(r *http.Request) net.IP {
+	return GetIPWithMask(r, limiter.Options)
+}
+
+// GetIPKey extracts IP from request and returns hashed IP to use as store key.
+func (limiter *Limiter) GetIPKey(r *http.Request) string {
+	return limiter.GetIPWithMask(r).String()
+}
+
+// GetIP returns IP address from request.
+// If options is defined and TrustForwardHeader is true, it will lookup IP in
+// X-Forwarded-For and X-Real-IP headers.
+func GetIP(r *http.Request, options ...Options) net.IP {
+	if len(options) >= 1 && options[0].TrustForwardHeader {
 		ip := r.Header.Get("X-Forwarded-For")
 		if ip != "" {
 			parts := strings.SplitN(ip, ",", 2)
@@ -39,18 +56,17 @@ func (limiter *Limiter) GetIP(r *http.Request) net.IP {
 }
 
 // GetIPWithMask returns IP address from request by applying a mask.
-func (limiter *Limiter) GetIPWithMask(r *http.Request) net.IP {
-	ip := limiter.GetIP(r)
+func GetIPWithMask(r *http.Request, options ...Options) net.IP {
+	if len(options) == 0 {
+		return GetIP(r)
+	}
+
+	ip := GetIP(r, options[0])
 	if ip.To4() != nil {
-		return ip.Mask(limiter.Options.IPv4Mask)
+		return ip.Mask(options[0].IPv4Mask)
 	}
 	if ip.To16() != nil {
-		return ip.Mask(limiter.Options.IPv6Mask)
+		return ip.Mask(options[0].IPv6Mask)
 	}
 	return ip
 }
-
-// GetIPKey extracts IP from request and returns hashed IP to use as store key.
-func (limiter *Limiter) GetIPKey(r *http.Request) string {
-	return limiter.GetIPWithMask(r).String()
-}