diff --git a/cp/app/Controllers/RegistrarsController.php b/cp/app/Controllers/RegistrarsController.php
index 20c60f3..8492101 100644
--- a/cp/app/Controllers/RegistrarsController.php
+++ b/cp/app/Controllers/RegistrarsController.php
@@ -167,15 +167,16 @@ class RegistrarsController extends Controller
                     ]
                 );
                 $registrar_id = $db->getLastInsertId();
-                
+                $prefix = 'R' . str_pad($registrar_id, 4, '0', STR_PAD_LEFT);
+
                 $db->exec(
                     'UPDATE registrar SET prefix = ? WHERE id = ?',
                     [
-                        'R'.$registrar_id,
+                        $prefix,
                         $registrar_id
                     ]
                 );
-                
+
                 $db->insert(
                     'registrar_contact',
                     [
diff --git a/database/registry.mariadb.sql b/database/registry.mariadb.sql
index ba84ff1..eda10eb 100644
--- a/database/registry.mariadb.sql
+++ b/database/registry.mariadb.sql
@@ -105,7 +105,7 @@ CREATE TABLE IF NOT EXISTS `registry`.`registrar` (
     `iana_id` int(5) DEFAULT NULL,
     `clid` varchar(16) NOT NULL,
     `pw` varchar(256) NOT NULL,
-    `prefix` char(2) NOT NULL,
+    `prefix` char(5) NOT NULL,
     `email` varchar(255) NOT NULL,
     `whois_server` varchar(255) NOT NULL,
     `rdap_server` varchar(255) NOT NULL,
diff --git a/database/registry.postgres.sql b/database/registry.postgres.sql
index 510a339..f9c7e5f 100644
--- a/database/registry.postgres.sql
+++ b/database/registry.postgres.sql
@@ -102,7 +102,7 @@ CREATE TABLE registrar (
      "iana_id"   int DEFAULT NULL,
      "clid"   varchar(16) NOT NULL,
      "pw"   varchar(256) NOT NULL,
-     "prefix"   char(2) NOT NULL,
+     "prefix"   char(5) NOT NULL,
      "email"   varchar(255) NOT NULL,
      "whois_server"   varchar(255) NOT NULL,
      "rdap_server"   varchar(255) NOT NULL,
diff --git a/database/registry.sqlite.sql b/database/registry.sqlite.sql
index b80134a..a5670be 100644
--- a/database/registry.sqlite.sql
+++ b/database/registry.sqlite.sql
@@ -111,7 +111,7 @@ CREATE TABLE IF NOT EXISTS registrar (
     iana_id INTEGER DEFAULT NULL,
     clid VARCHAR(16) NOT NULL,
     pw VARCHAR(256) NOT NULL,
-    prefix CHAR(2) NOT NULL,
+    prefix CHAR(5) NOT NULL,
     email VARCHAR(255) NOT NULL,
     whois_server VARCHAR(255) NOT NULL,
     rdap_server VARCHAR(255) NOT NULL,
diff --git a/docs/update1016.sh b/docs/update1016.sh
index 72c05b6..3c3ab10 100644
--- a/docs/update1016.sh
+++ b/docs/update1016.sh
@@ -156,10 +156,20 @@ else
     echo "New error_log table created successfully."
 fi
 
+# Modify column prefix from CHAR(2) to CHAR(5) in registrar table
+echo "Updating prefix column in registrar table..."
+mysql -u$DB_USER -p$DB_PASS $DB_NAME -e "ALTER TABLE registrar MODIFY prefix CHAR(5) NOT NULL;"
+
+if [ $? -ne 0 ]; then
+    echo "Warning: Failed to update prefix column in registrar table."
+else
+    echo "Prefix column updated successfully."
+fi
+
 CONFIG_FILE="/opt/registry/automation/config.php"
 
 # Define the content to insert
-INSERT_CONTENT="\n    // Registry Admin Email\n    'admin_email' => 'admin@example.com', // Receives system notifications\n\n    // Exchange Rate Configuration\n    'exchange_rate_api_key' => "", // Your exchangerate.host API key\n    'exchange_rate_base_currency' => "USD",\n    'exchange_rate_currencies' => [\"EUR\", \"GBP\", \"JPY\", \"CAD\", \"AUD\"], // Configurable list\n"
+INSERT_CONTENT="\n    // Registry Admin Email\n    'admin_email' => 'admin@example.com', // Receives system notifications\n\n    // Exchange Rate Configuration\n    'exchange_rate_api_key' => \"\", // Your exchangerate.host API key\n    'exchange_rate_base_currency' => 'USD',\n    'exchange_rate_currencies' => [\"EUR\", \"GBP\", \"JPY\", \"CAD\", \"AUD\"], // Configurable list\n"
 
 # Check if 'admin_email' exists and insert only if it does not exist
 if ! grep -q "'admin_email' => 'admin@example.com'" "$CONFIG_FILE"; then