diff --git a/solutions/1101-1200/1108-defanging-an-ip-address/README.md b/solutions/1101-1200/1108-defanging-an-ip-address/README.md
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@@ -0,0 +1,11 @@
+# 1108. Defanging an IP Address
+
+[LeetCode problem 1108](https://leetcode.com/problems/defanging-an-ip-address/)
+
+- **Difficulty**: Easy
+- **Tags**: string
+
+## Description
+
+Given a valid IPv4 address, return a defanged version of it, replacing every
+`.` with `[.]`.
diff --git a/solutions/1101-1200/1108-defanging-an-ip-address/solution.cpp b/solutions/1101-1200/1108-defanging-an-ip-address/solution.cpp
new file mode 100644
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+++ b/solutions/1101-1200/1108-defanging-an-ip-address/solution.cpp
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+#include "solution.hpp"
+
+namespace leetcode::p1108 {
+
+std::string solve(const std::string& address) {
+    std::string result;
+    result.reserve(address.size());
+
+    for (char c : address) {
+        if (c == '.') {
+            result += "[.]";
+        } else {
+            result += c;
+        }
+    }
+
+    return result;
+}
+
+} // namespace leetcode::p1108
diff --git a/solutions/1101-1200/1108-defanging-an-ip-address/solution.hpp b/solutions/1101-1200/1108-defanging-an-ip-address/solution.hpp
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+++ b/solutions/1101-1200/1108-defanging-an-ip-address/solution.hpp
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+#pragma once
+
+#include <string>
+
+namespace leetcode::p1108 {
+
+// optimized: O(n) time, O(n) space — build the result one character at a
+// time, expanding '.' into "[.]".
+std::string solve(const std::string& address);
+
+} // namespace leetcode::p1108
diff --git a/solutions/1101-1200/1108-defanging-an-ip-address/test.cpp b/solutions/1101-1200/1108-defanging-an-ip-address/test.cpp
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+++ b/solutions/1101-1200/1108-defanging-an-ip-address/test.cpp
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+#include <catch2/catch_test_macros.hpp>
+
+#include "solution.hpp"
+
+TEST_CASE("Problem 1108", "[p1108]") {
+    CHECK(leetcode::p1108::solve("1.1.1.1") == "1[.]1[.]1[.]1");
+    CHECK(leetcode::p1108::solve("255.100.50.0") == "255[.]100[.]50[.]0");
+}
diff --git a/swift/1108.swift b/swift/1108.swift
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--- a/swift/1108.swift
+++ /dev/null
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-func defangIPaddr(_ address: String) -> String {
-    var result = ""
-
-    for char in address {
-        if char != "." {
-            result.append(char)
-        } else {
-            result.append("[.]")
-        }
-    }
-
-    return result
-}
-
-var test1 = "1.1.1.1"
-let result = defangIPaddr(test1)
-print(result) // 1[.]1[.]1[.]1
\ No newline at end of file