diff --git a/lib/define.php b/lib/define.php
index 8d81432..1729cf9 100644
--- a/lib/define.php
+++ b/lib/define.php
@@ -9,4 +9,6 @@ $files4 = scandir ("../registry/data/route/");
 // Define array() we are gonna store data inside.
 $roas = array();
 
+define ("MAX_LEN_IPV4", 28);
+define ("MAX_LEN_IPV6", 64);
 ?>
diff --git a/rfc8416.php b/rfc8416.php
index 2924e48..bb75782 100755
--- a/rfc8416.php
+++ b/rfc8416.php
@@ -91,7 +91,7 @@ foreach ($raw_array as $sub_array)
     $_maxlength = (isset ($maxlength[0]) ? $maxlength[0] : "");
   else
     // Do fallback to default prefix size if max-length was not set.
-    $_maxlength = ($prefix[2] < 64 ? 64 : $prefix[2]);
+    $_maxlength = ($prefix[2] < MAX_LEN_IPV6 ? MAX_LEN_IPV6 : $prefix[2]);
   
   $_mnt = $mnt[0];
 
@@ -190,7 +190,7 @@ foreach ($raw_array as $sub_array)
     $_maxlength = (isset ($maxlength[0]) ? $maxlength[0] : "");
   else
     // Do fallback to default prefix size if max-length was not set.
-    $_maxlength = ($prefix[2] < 29 ? 29 : $prefix[2]);
+    $_maxlength = ($prefix[2] < MAX_LEN_IPV4 ? MAX_LEN_IPV4 : $prefix[2]);
 
   $_mnt = $mnt[0];
   
diff --git a/roagen.php b/roagen.php
index 761712a..8be16c8 100755
--- a/roagen.php
+++ b/roagen.php
@@ -77,7 +77,7 @@ foreach ($raw_array as $sub_array)
     $_maxlength = (isset ($maxlength[0]) ? $maxlength[0] : "");
   else
     // Do fallback to default prefix size if max-length was not set.
-    $_maxlength = ($prefix[2] < 64 ? 64 : $prefix[2]);
+    $_maxlength = ($prefix[2] < MAX_LEN_IPV6 ? MAX_LEN_IPV6 : $prefix[2]);
 
   // Loop through each asn in single route6 object and assign
   // other values accordingly.
@@ -167,7 +167,7 @@ foreach ($raw_array as $sub_array)
     $_maxlength = (isset ($maxlength[0]) ? $maxlength[0] : "");
   else
     // Do fallback to default prefix size if max-length was not set.
-    $_maxlength = ($prefix[2] < 29 ? 29 : $prefix[2]);
+    $_maxlength = ($prefix[2] < MAX_LEN_IPV4 ? MAX_LEN_IPV4 : $prefix[2]);
 
   // Loop through each asn in single route6 object and assign
   // other values accordingly.