diff --git a/misc/config-file.func b/misc/config-file.func
index e6b2f62..33d8c5a 100644
--- a/misc/config-file.func
+++ b/misc/config-file.func
@@ -265,7 +265,7 @@ config_file() {
 
   local ip_cidr_regex='^([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})/([0-9]{1,2})$'
   local ip_regex='^([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$'
-  ip_range_regex="^([0-9]{1,3}\.){3}[0-9]{1,3}/[0-9]{1,2}-([0-9]{1,3}\.){3}[0-9]{1,3}/[0-9]{1,2}$"
+  local ip_cidr_range_regex="^([0-9]{1,3}\.){3}[0-9]{1,3}/[0-9]{1,2}$"
 
   if [[ -n ${NET-} ]]; then
     if [ "$NET" == "dhcp" ]; then
@@ -285,34 +285,49 @@ config_file() {
         msg_error "Gateway IP Address cannot be empty"
         exit
       fi
-    elif [[ "$NET" =~ ^([0-9]+\.[0-9]+\.[0-9]+)\.([0-9]+)/([0-9]+)-([0-9]+)/([0-9]+)$ ]]; then
-      base="${BASH_REMATCH[1]}"
-      start="${BASH_REMATCH[2]}"
-      end="${BASH_REMATCH[4]}"
-      cidr_start="${BASH_REMATCH[3]}"
-      cidr_end="${BASH_REMATCH[5]}"
+    elif [[ "$NET" == *-* ]]; then
+      IFS="-" read -r ip_start ip_end <<< "$NET"
 
-      # Optional check: CIDR must match (can be customized)
-      if [[ "$cidr_start" != "$cidr_end" ]]; then
-        msg_error "Mismatched CIDR: /$cidr_start and /$cidr_end"
+      if [[ ! "$ip_start" =~ $ip_cidr_regex ]] || [[ ! "$ip_end" =~ $ip_cidr_regex ]]; then
+        echo "Invalid IP range format: $NET"
         exit 1
       fi
 
-      msg_info "Checking IPs from $base.$start/$cidr_start to $base.$end/$cidr_start"
+      # Extract IPs and ignore CIDR for scanning
+      ip1="${ip_start%%/*}"
+      ip2="${ip_end%%/*}"
+      cidr="${ip_start##*/}"
 
-      for ((i=start; i<=end; i++)); do
-        ip="$base.$i"
-        if ! ping -c 1 -W 1 "$ip" > /dev/null 2>&1; then
-          NET="$ip/$cidr_start"
-          msg_ok "Selected unused IP: $NET"
+      # Convert IP to integer
+      ip_to_int() {
+        local IFS=.
+        read -r i1 i2 i3 i4 <<< "$1"
+        echo $(( (i1 << 24) + (i2 << 16) + (i3 << 8) + i4 ))
+      }
+
+      # Convert integer back to IP
+      int_to_ip() {
+        local ip=$1
+        echo "$(( (ip >> 24) & 0xFF )).$(( (ip >> 16) & 0xFF )).$(( (ip >> 8) & 0xFF )).$(( ip & 0xFF ))"
+      }
+
+      start_int=$(ip_to_int "$ip1")
+      end_int=$(ip_to_int "$ip2")
+
+      for ((ip_int=start_int; ip_int<=end_int; ip_int++)); do
+        ip=$(int_to_ip $ip_int)
+        if ! ping -c 1 -W 1 "$ip" >/dev/null 2>&1; then
+          NET="$ip/$cidr"
+          echo "Selected unused IP: $NET"
           break
         fi
       done
 
-      if [[ ! "$NET" =~ / ]]; then
-        msg_error "No free IP found in range"
+      if [[ "$NET" == *-* ]]; then
+        echo "No free IP found in range"
         exit 1
       fi
+
       if [ -n "$GATE" ]; then
         if [[ "$GATE" =~ $ip_regex ]]; then
           echo -e "${GATEWAY}${BOLD}${DGN}Gateway IP Address: ${BGN}$GATE${CL}"