diff --git a/bin/tests/test_string.cpp b/bin/tests/test_string.cpp
index b11bc9c333e..2e8f5c34944 100644
--- a/bin/tests/test_string.cpp
+++ b/bin/tests/test_string.cpp
@@ -846,19 +846,58 @@ bool test_28() {
 
 bool test_29() {
 
+	bool error = false;
+	bool state = true;
+	bool success = false;
+
 	IP_Address ip0("2001:0db8:85a3:0000:0000:8a2e:0370:7334");
-	printf("ip0 is %ls\n", String(ip0).c_str());
+	OS::get_singleton()->print("ip0 is %ls\n", String(ip0).c_str());
 
 	IP_Address ip(0x0123, 0x4567, 0x89ab, 0xcdef, IP_Address::TYPE_IPV6);
-	printf("ip6 is %ls\n", String(ip).c_str());
+	OS::get_singleton()->print("ip6 is %ls\n", String(ip).c_str());
 
 	IP_Address ip2("fe80::52e5:49ff:fe93:1baf");
-	printf("ip6 is %ls\n", String(ip2).c_str());
+	OS::get_singleton()->print("ip6 is %ls\n", String(ip2).c_str());
 
 	IP_Address ip3("::ffff:192.168.0.1");
-	printf("ip6 is %ls\n", String(ip3).c_str());
+	OS::get_singleton()->print("ip6 is %ls\n", String(ip3).c_str());
 
-	return true;
+	String ip4 = "192.168.0.1";
+	success = ip4.is_valid_ip_address();
+	OS::get_singleton()->print("Is valid ipv4: %ls, %s\n", ip4.c_str(), success ? "OK" : "FAIL");
+	if (!success) state = false;
+
+	ip4 = "192.368.0.1";
+	success = (!ip4.is_valid_ip_address());
+	OS::get_singleton()->print("Is invalid ipv4: %ls, %s\n", ip4.c_str(), success ? "OK" : "FAIL");
+	if (!success) state = false;
+
+	String ip6 = "2001:0db8:85a3:0000:0000:8a2e:0370:7334";
+	success = ip6.is_valid_ip_address();
+	OS::get_singleton()->print("Is valid ipv6: %ls, %s\n", ip6.c_str(), success ? "OK" : "FAIL");
+	if (!success) state = false;
+
+	ip6 = "2001:0db8:85j3:0000:0000:8a2e:0370:7334";
+	success = (!ip6.is_valid_ip_address());
+	OS::get_singleton()->print("Is invalid ipv6: %ls, %s\n", ip6.c_str(), success ? "OK" : "FAIL");
+	if (!success) state = false;
+
+	ip6 = "2001:0db8:85f345:0000:0000:8a2e:0370:7334";
+	success = (!ip6.is_valid_ip_address());
+	OS::get_singleton()->print("Is invalid ipv6: %ls, %s\n", ip6.c_str(), success ? "OK" : "FAIL");
+	if (!success) state = false;
+
+	ip6 = "2001:0db8::0:8a2e:370:7334";
+	success = (ip6.is_valid_ip_address());
+	OS::get_singleton()->print("Is valid ipv6: %ls, %s\n", ip6.c_str(), success ? "OK" : "FAIL");
+	if (!success) state = false;
+
+	ip6 = "::ffff:192.168.0.1";
+	success = (ip6.is_valid_ip_address());
+	OS::get_singleton()->print("Is valid ipv6: %ls, %s\n", ip6.c_str(), success ? "OK" : "FAIL");
+	if (!success) state = false;
+
+	return state;
 };
 
 typedef bool (*TestFunc)(void);
diff --git a/core/ustring.cpp b/core/ustring.cpp
index 2e907381f76..f9c10615b31 100644
--- a/core/ustring.cpp
+++ b/core/ustring.cpp
@@ -1543,11 +1543,11 @@ String::String(const StrRange& p_range) {
 	copy_from(p_range.c_str,p_range.len);
 }
 
-int String::hex_to_int() const {
+int String::hex_to_int(bool p_with_prefix) const {
 
     int l = length();
-    if (l<3)
-           return 0;
+	if (p_with_prefix && l<3)
+		return 0;
 
     const CharType *s=ptr();
 
@@ -1556,15 +1556,16 @@ int String::hex_to_int() const {
     if (sign<0) {
         s++;
         l--;
-        if (l<2)
+		if (p_with_prefix && l<2)
             return 0;
     }
 
-    if (s[0]!='0' || s[1]!='x')
-           return 0;
-
-    s+=2;
-    l-=2;
+	if (p_with_prefix) {
+		if (s[0]!='0' || s[1]!='x')
+			return 0;
+		s+=2;
+		l-=2;
+	};
 
     int hex=0;
 
@@ -3510,6 +3511,36 @@ bool String::is_valid_integer() const {
 
 }
 
+bool String::is_valid_hex_number(bool p_with_prefix) const {
+
+	int from = 0;
+	int len = length();
+
+	if (len!=1 && (operator[](0)=='+' || operator[](0)=='-'))
+		from++;
+
+	if (p_with_prefix) {
+
+		if (len < 2)
+			return false;
+		if (operator[](from) != '0' || operator[](from+1) != 'x') {
+			return false;
+		};
+		from += 2;
+	};
+
+	for (int i=from; i<len; i++) {
+
+		CharType c = operator[](i);
+		if ((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F'))
+			continue;
+		return false;
+	};
+
+	return true;
+};
+
+
 bool String::is_valid_float() const {
 
 	int len = length();
@@ -3646,20 +3677,41 @@ bool String::is_valid_html_color() const {
 
 }
 
+
 bool String::is_valid_ip_address() const {
 
-	Vector<String> ip = split(".");
-	if (ip.size()!=4)
-		return false;
-	for(int i=0;i<ip.size();i++) {
+	if (find(":") >= 0) {
 
-		String n = ip[i];
-		if (!n.is_valid_integer())
+		Vector<String> ip = split(":");
+		for (int i=0; i<ip.size(); i++) {
+
+			String n = ip[i];
+			if (n.empty())
+				continue;
+			if (n.is_valid_hex_number(false)) {
+				int nint = n.hex_to_int(false);
+				if (nint < 0 || nint > 0xffff)
+					return false;
+				continue;
+			};
+			if (!n.is_valid_ip_address())
+				return false;
+		};
+
+	} else {
+		Vector<String> ip = split(".");
+		if (ip.size()!=4)
 			return false;
-		int val = n.to_int();
-		if (val<0 || val>255)
-			return false;
-	}
+		for(int i=0;i<ip.size();i++) {
+
+			String n = ip[i];
+			if (!n.is_valid_integer())
+				return false;
+			int val = n.to_int();
+			if (val<0 || val>255)
+				return false;
+		}
+	};
 
 	return true;
 }
diff --git a/core/ustring.h b/core/ustring.h
index 09d13a9e641..452f2528570 100644
--- a/core/ustring.h
+++ b/core/ustring.h
@@ -144,7 +144,7 @@ public:
 	bool is_numeric() const;
 	double to_double() const;
 	float to_float() const;
-	int hex_to_int() const;
+	int hex_to_int(bool p_with_prefix = true) const;
 	int to_int() const;
 
 	int64_t to_int64() const;
@@ -226,6 +226,7 @@ public:
 	bool is_valid_identifier() const;
 	bool is_valid_integer() const;
 	bool is_valid_float() const;
+	bool is_valid_hex_number(bool p_with_prefix) const;
 	bool is_valid_html_color() const;
 	bool is_valid_ip_address() const;