diff --git a/baked_in.go b/baked_in.go
index 80e02779..df2cfa58 100644
--- a/baked_in.go
+++ b/baked_in.go
@@ -2916,7 +2916,32 @@ func isHostnameRFC952(fl FieldLevel) bool {
 }
 
 func isHostnameRFC1123(fl FieldLevel) bool {
-	return hostnameRegexRFC1123().MatchString(fl.Field().String())
+	val := fl.Field().String()
+	if !hostnameRegexRFC1123().MatchString(val) {
+		return false
+	}
+	// Per RFC 1123 Section 2.1, host names cannot have the dotted-decimal
+	// format #.#.#.# unless they represent a valid IP address. If the value
+	// has four dot-separated numeric parts, verify that it parses as a valid IP.
+	if looksLikeIPv4(val) {
+		return net.ParseIP(val) != nil
+	}
+	return true
+}
+
+// looksLikeIPv4 reports whether s consists of exactly four dot-separated
+// numeric components (e.g. "192.168.0.1", "277.168.0.1").
+func looksLikeIPv4(s string) bool {
+	parts := 1
+	for i := 0; i < len(s); i++ {
+		c := s[i]
+		if c == '.' {
+			parts++
+		} else if c < '0' || c > '9' {
+			return false
+		}
+	}
+	return parts == 4
 }
 
 func isHostnameLabel(fl FieldLevel) bool {
diff --git a/validator_test.go b/validator_test.go
index ffaf582f..2b5adcf9 100644
--- a/validator_test.go
+++ b/validator_test.go
@@ -11248,6 +11248,20 @@ func TestHostnameRFC1123Validation(t *testing.T) {
 		{"example.", false},
 		{"test_example", false},
 		{"192.168.0.1", true},
+		{"277.168.0.1", false},
+		{"999.999.999.999", false},
+		{"1.2.3.256", false},
+		{"256.0.0.1", false},
+		{"0.0.0.0", true},
+		{"255.255.255.255", true},
+		{"3com.com", true},
+		{"1and1.com", true},
+		{"7-eleven.com", true},
+		{"1234", true},
+		{"12345", true},
+		{"1.2.3", true},
+		{"1.2.3.4.5", true},
+		{"192.168.0.a", true},
 		{"email@example.com", false},
 		{"2001:cdba:0000:0000:0000:0000:3257:9652", false},
 		{"2001:cdba:0:0:0:0:3257:9652", false},
@@ -11308,6 +11322,13 @@ func TestHostnameRFC1123AliasValidation(t *testing.T) {
 		{"example.", false},
 		{"test_example", false},
 		{"192.168.0.1", true},
+		{"277.168.0.1", false},
+		{"999.999.999.999", false},
+		{"1.2.3.256", false},
+		{"0.0.0.0", true},
+		{"255.255.255.255", true},
+		{"1.2.3", true},
+		{"1234", true},
 		{"email@example.com", false},
 		{"2001:cdba:0000:0000:0000:0000:3257:9652", false},
 		{"2001:cdba:0:0:0:0:3257:9652", false},