diff --git a/internal/dnsforward/rebind.go b/internal/dnsforward/rebind.go
index c625da12..1215e095 100644
--- a/internal/dnsforward/rebind.go
+++ b/internal/dnsforward/rebind.go
@@ -66,41 +66,48 @@ func (c *dnsRebindChecker) isRebindHost(host string) bool {
 	return host == "localhost"
 }
 
+func (c *dnsRebindChecker) isLocalNetworkV4(ip4 net.IP) bool {
+	switch {
+	case ip4[0] == 0:
+		/* 0.0.0.0/8 (RFC 5735 section 3. "here" network) */
+	case ip4[0] == 10:
+		/* 10.0.0.0/8     (private)  */
+	case ip4[0] == 172 && ip4[1]&0x10 == 0x10:
+		/* 172.16.0.0/12  (private)  */
+	case ip4[0] == 169 && ip4[1] == 254:
+		/* 169.254.0.0/16 (zeroconf) */
+	case ip4[0] == 192 && ip4[1] == 0 && ip4[2] == 2:
+		/* 192.0.2.0/24   (test-net) */
+	case ip4[0] == 198 && ip4[1] == 51 && ip4[2] == 100:
+		/* 198.51.100.0/24(test-net) */
+	case ip4[0] == 203 && ip4[1] == 0 && ip4[2] == 113:
+		/* 203.0.113.0/24 (test-net) */
+	case ip4.Equal(net.IPv4bcast):
+		/* 255.255.255.255/32 (broadcast)*/
+	default:
+		return false
+	}
+
+	return true
+}
+
+func (c *dnsRebindChecker) isLocalNetworkV6(ip6 net.IP) bool {
+	return ip6.Equal(net.IPv6zero) ||
+		ip6.Equal(net.IPv6unspecified) ||
+		ip6.Equal(net.IPv6interfacelocalallnodes) ||
+		ip6.Equal(net.IPv6linklocalallnodes) ||
+		ip6.Equal(net.IPv6linklocalallrouters)
+}
+
 func (c *dnsRebindChecker) isRebindIP(ip net.IP) bool {
 	// This is compatible with dnsmasq definition
 	// See: https://github.com/imp/dnsmasq/blob/4e7694d7107d2299f4aaededf8917fceb5dfb924/src/rfc1035.c#L412
 
 	rebind := false
 	if ip4 := ip.To4(); ip4 != nil {
-
-		/* 0.0.0.0/8 (RFC 5735 section 3. "here" network) */
-		rebind = ip4[0] == 0 ||
-
-			/* 10.0.0.0/8     (private)  */
-			ip4[0] == 10 ||
-
-			/* 172.16.0.0/12  (private)  */
-			(ip4[0] == 172 && ip4[1]&0x10 == 0x10) ||
-
-			/* 169.254.0.0/16 (zeroconf) */
-			(ip4[0] == 169 && ip4[1] == 254) ||
-
-			/* 192.0.2.0/24   (test-net) */
-			(ip4[0] == 192 && ip4[1] == 0 && ip4[2] == 2) ||
-
-			/* 198.51.100.0/24(test-net) */
-			(ip4[0] == 198 && ip4[1] == 51 && ip4[2] == 100) ||
-
-			/* 203.0.113.0/24 (test-net) */
-			(ip4[0] == 203 && ip4[1] == 0 && ip4[2] == 113) ||
-
-			/* 255.255.255.255/32 (broadcast)*/
-			ip4.Equal(net.IPv4bcast)
+		rebind = c.isLocalNetworkV4(ip4)
 	} else {
-		rebind = ip.Equal(net.IPv6zero) || ip.Equal(net.IPv6unspecified) ||
-			ip.Equal(net.IPv6interfacelocalallnodes) ||
-			ip.Equal(net.IPv6linklocalallnodes) ||
-			ip.Equal(net.IPv6linklocalallrouters)
+		rebind = c.isLocalNetworkV6(ip)
 	}
 
 	return rebind || c.isPrivate(ip) || ip.IsLoopback()