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diff --git a/tools/extract_asn1_from_spec.pl b/tools/extract_asn1_from_spec.pl
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+++ b/tools/extract_asn1_from_spec.pl
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+#!/usr/bin/perl
+#
+# This script extracts the ASN1 definition from TS 36.331/36.355/25.331/38.331/37.355/36.413/38.413/36.423/38.423
+# /38.463/38.473 , and generates asn files that can be processed by asn2wrs
+# First download the specification from 3gpp.org as a word document and open it
+# Then in "view" menu, select normal, draft or web layout (any kind that removes page header and footers)
+# Finally save the document as a text file
+# Example with TS 36.331: "perl extract_asn1_from_spec.pl 36331-xxx.txt"
+# It should generate: EUTRA-RRC-Definitions.asn, EUTRA-UE-Variables.asn and EUTRA-InterNodeDefinitions
+#
+# Copyright 2011 Vincent Helfre and Erwan Yvin
+#
+# Wireshark - Network traffic analyzer
+# By Gerald Combs <gerald@wireshark.org>
+# Copyright 1998 Gerald Combs
+#
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+use warnings;
+$input_file = $ARGV[0];
+$version = 0;
+
+sub extract_spec_version;
+sub extract_asn1;
+
+open(INPUT_FILE, "< $input_file") or die "Can not open file $input_file";
+
+extract_spec_version();
+
+extract_asn1();
+
+close(INPUT_FILE);
+
+# This subroutine extracts the version of the specification
+sub extract_spec_version {
+  my $line;
+  while($line = <INPUT_FILE>){
+    if($line =~ m/3GPP TS ((25|36|38)\.331|(36|37)\.355|(36|38)\.413|(36|38)\.423|36\.(443|444)|(36|38)\.455|38\.463|38\.473|37\.483) V/){
+      $version = $line;
+      return;
+    }
+  }
+}
+
+# This subroutine copies the text delimited by -- ASN1START and -- ASN1STOP in INPUT_FILE
+# and copies it into OUTPUT_FILE.
+# The OUTPUT_FILE is opened on encounter of the keyword "DEFINITIONS AUTOMATIC TAGS"
+# and closed on encounter of the keyword "END"
+sub extract_asn1 {
+  my $line;
+  my $prev_line;
+  my $is_asn1 = 0;
+  my $output_file_name = 0;
+  my $file_name_found = 0;
+
+  while($line = <INPUT_FILE>){
+    if ($line =~ m/-- ASN1STOP/) {
+      $is_asn1 = 0;
+    }
+
+    if(($file_name_found == 0) && ($line =~ m/^LPP-PDU-Definitions/)){
+      $output_file_name = "LPP-PDU-Definitions.asn";
+      print  "generating $output_file_name\n";
+      open(OUTPUT_FILE, "> $output_file_name") or die "Can not open file $output_file_name";
+      $file_name_found = 1;
+      syswrite OUTPUT_FILE,"-- "."$version"."\n";
+    }
+
+    if(($file_name_found == 0) && ($line =~ m/^LPP-Broadcast-Definitions/)){
+      $output_file_name = "LPP-Broadcast-Definitions.asn";
+      print  "generating $output_file_name\n";
+      open(OUTPUT_FILE, "> $output_file_name") or die "Can not open file $output_file_name";
+      $file_name_found = 1;
+      syswrite OUTPUT_FILE,"-- "."$version"."\n";
+    }
+
+    if(($file_name_found == 0) && ($line =~ m/SonTransfer-IEs/)){
+      $output_file_name = "S1AP-SonTransfer-IEs.asn";
+      print  "generating $output_file_name\n";
+      open(OUTPUT_FILE, "> $output_file_name") or die "Can not open file $output_file_name";
+      $is_asn1 = 1;
+      $file_name_found = 1;
+      syswrite OUTPUT_FILE,"-- "."$version"."\n";
+    }
+
+    if(($file_name_found == 0) && ($line =~ m/itu-t \(0\) identified-organization \(4\) etsi \(0\) mobileDomain \(0\)/)){
+      ($output_file_name) = ($prev_line =~ m/^([a-zA-Z0-9\-]+)\s/);
+      $output_file_name = "$output_file_name".".asn";
+      print  "generating $output_file_name\n";
+      open(OUTPUT_FILE, "> $output_file_name") or die "Can not open file $output_file_name";
+      $is_asn1 = 1;
+      $file_name_found = 1;
+      syswrite OUTPUT_FILE,"-- "."$version"."\n";
+      syswrite OUTPUT_FILE,"$prev_line";
+    }
+
+    if(($file_name_found == 0) && ($line =~ m/DEFINITIONS AUTOMATIC TAGS ::=/)){
+      ($output_file_name) = ($line =~ m/^([a-zA-Z0-9\-]+)\s+DEFINITIONS AUTOMATIC TAGS ::=/);
+      $output_file_name = "$output_file_name".".asn";
+      print  "generating $output_file_name\n";
+      open(OUTPUT_FILE, "> $output_file_name") or die "Can not open file $output_file_name";
+      $is_asn1 = 1;
+      $file_name_found = 1;
+      syswrite OUTPUT_FILE,"-- "."$version"."\n";
+    }
+
+    if (($line =~ /^END[\r\n]/) && (defined fileno OUTPUT_FILE)){
+      syswrite OUTPUT_FILE,"$line";
+      close(OUTPUT_FILE);
+      $is_asn1 = 0;
+      $file_name_found = 0;
+    }
+
+    if (($is_asn1 == 1) && (defined fileno OUTPUT_FILE)){
+      syswrite OUTPUT_FILE,"$line";
+    }
+
+    if ($line =~ m/-- ASN1START/) {
+      $is_asn1 = 1;
+    }
+
+    $prev_line = $line;
+  }
+}
+