diff --git a/src/IpAddress.php b/src/IpAddress.php
index aaeeabd..0376dba 100644
--- a/src/IpAddress.php
+++ b/src/IpAddress.php
@@ -33,14 +33,14 @@ class IpAddress implements MiddlewareInterface
      *
      * @var array
      */
-    protected $trustedWildcard;
+    protected $trustedWildcards;
 
     /**
      * List of trusted proxy IP CIDR ranges
      *
      * @var array
      */
-    protected $trustedCidr;
+    protected $trustedCidrs;
 
     /**
      * Name of the attribute added to the ServerRequest object
@@ -86,23 +86,10 @@ public function __construct(
             foreach ($trustedProxies as $proxy) {
                 if (strpos($proxy, '*') !== false) {
                     // Wildcard IP address
-                    // IPv6 is 8 parts separated by ':'
-                    if (strpos($proxy, '.') > 0) {
-                        $delim = '.';
-                        $parts = 4;
-                    } else {
-                        $delim = ':';
-                        $parts = 8;
-                    }
-                    $this->trustedWildcard[] = explode($delim, $proxy, $parts);
+                    $this->trustedWildcards[] = $this->parseWildcard($proxy);
                 } elseif (strpos($proxy, '/') > 6) {
                     // CIDR notation
-                    list($subnet, $bits) = explode('/', $proxy, 2);
-                    $subnet = ip2long($subnet);
-                    $mask = -1 << (32 - $bits);
-                    $min = $subnet & $mask;
-                    $max = $subnet | ~$mask;
-                    $this->trustedCidr[] = [$min, $max];
+                    $this->trustedCidrs[] = $this->parseCidr($proxy);
                 } else {
                     // String-match IP address
                     $this->trustedProxies[] = $proxy;
@@ -113,11 +100,46 @@ public function __construct(
         if ($attributeName) {
             $this->attributeName = $attributeName;
         }
+
         if (!empty($headersToInspect)) {
             $this->headersToInspect = $headersToInspect;
         }
     }
 
+    /**
+     * @param string $ipAddress
+     * @return array
+     */
+    private function parseWildcard(string $ipAddress)
+    {
+        // IPv4 has 4 parts separated by '.'
+        // IPv6 has 8 parts separated by ':'
+        if (strpos($ipAddress, '.') > 0) {
+            $delim = '.';
+            $parts = 4;
+        } else {
+            $delim = ':';
+            $parts = 8;
+        }
+
+        return explode($delim, $ipAddress, $parts);
+    }
+
+    /**
+     * @param string $ipAddress
+     * @return array
+     */
+    private function parseCidr(string $ipAddress)
+    {
+        list($subnet, $bits) = explode('/', $ipAddress, 2);
+        $subnet = ip2long($subnet);
+        $mask = -1 << (32 - $bits);
+        $min = $subnet & $mask;
+        $max = $subnet | ~$mask;
+
+        return [$min, $max];
+    }
+
     /**
      * {@inheritDoc}
      *
@@ -180,7 +202,7 @@ protected function determineClientIpAddress($request)
             }
 
             // Wildcard Match
-            if ($this->checkProxyHeaders && $this->trustedWildcard) {
+            if ($this->checkProxyHeaders && $this->trustedWildcards) {
                 // IPv4 has 4 parts separated by '.'
                 // IPv6 has 8 parts separated by ':'
                 if (strpos($ipAddress, '.') > 0) {
@@ -190,8 +212,9 @@ protected function determineClientIpAddress($request)
                     $delim = ':';
                     $parts = 8;
                 }
+
                 $ipAddrParts = explode($delim, $ipAddress, $parts);
-                foreach ($this->trustedWildcard as $proxy) {
+                foreach ($this->trustedWildcards as $proxy) {
                     if (count($proxy) !== $parts) {
                         continue; // IP version does not match
                     }
@@ -199,7 +222,7 @@ protected function determineClientIpAddress($request)
                     foreach ($proxy as $i => $part) {
                         if ($part !== '*' && $part !== $ipAddrParts[$i]) {
                             $match = false;
-                            break;// IP does not match, move to next proxy
+                            break; // IP does not match, move to next proxy
                         }
                     }
                     if ($match) {
@@ -210,11 +233,11 @@ protected function determineClientIpAddress($request)
             }
 
             // CIDR Match
-            if ($this->checkProxyHeaders && $this->trustedCidr) {
+            if ($this->checkProxyHeaders && $this->trustedCidrs) {
                 // Only IPv4 is supported for CIDR matching
                 $ipAsLong = ip2long($ipAddress);
                 if ($ipAsLong) {
-                    foreach ($this->trustedCidr as $proxy) {
+                    foreach ($this->trustedCidrs as $proxy) {
                         if ($proxy[0] <= $ipAsLong && $ipAsLong <= $proxy[1]) {
                             $checkProxyHeaders = true;
                             break;
@@ -223,7 +246,7 @@ protected function determineClientIpAddress($request)
                 }
             }
 
-            if (!$this->trustedProxies && !$this->trustedWildcard && !$this->trustedCidr) {
+            if (!$this->trustedProxies && !$this->trustedWildcards && !$this->trustedCidrs) {
                 $checkProxyHeaders = true;
             }
 
@@ -279,6 +302,7 @@ protected function isValidIpAddress($ip)
         if (filter_var($ip, FILTER_VALIDATE_IP, $flags) === false) {
             return false;
         }
+
         return true;
     }
 
diff --git a/tests/IpAddressTest.php b/tests/IpAddressTest.php
index cb8526f..948ecdb 100644
--- a/tests/IpAddressTest.php
+++ b/tests/IpAddressTest.php
@@ -138,7 +138,6 @@ public function testIpIsNullIfMissingAndProxiesAreConfigured()
         $this->assertSame(null, $ipAddress);
     }
 
-
     public function testXForwardedForIp()
     {
         $middleware = new IPAddress(true, []);
@@ -163,7 +162,7 @@ public function testXForwardedForIpWithPort()
         $this->assertSame('192.168.1.3', $ipAddress);
     }
 
-    public function testProxyIpIsIgnored()
+    public function testProxyIpIsIgnoredWhenNoArgumentsProvided()
     {
         $middleware = new IPAddress();
         $env = [
@@ -294,7 +293,6 @@ public function testCustomHeader()
         $this->assertSame('192.168.1.3', $ipAddress);
     }
 
-
     public function testPSR15()
     {
         $middleware = new IPAddress();