diff --git a/ips/README.md b/ips/README.md
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+++ b/ips/README.md
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+* To retrieve ASN list use get_asndb.sh
+* convert_tsv.py ip2asn-v4.tsv ip2asn-v4.csv
diff --git a/ips/convert_tsv.py b/ips/convert_tsv.py
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+++ b/ips/convert_tsv.py
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+#!/usr/bin/env python3
+# Convert a TSV file to a asn.txt
+# Source:
+# range_start range_end AS_number country_code AS_description
+# Result:
+# subnet/mask AS_number AS_description country_code
+# 1.0.0.0/24      13335 eetc US
+# 1.0.4.0/22      38803 etc AU
+
+import sys
+import ipaddress
+import csv
+
+def calculate_subnets(line_list):
+    subnets = []
+    while True:
+        # Calculate from diff of range_start and range_end subnet size
+        # 1.1.1.0 1.1.2.0 = 256
+        subnet1_uint32 = int(ipaddress.IPv4Address(line_list[0]))
+        subnet2_uint32 = int(ipaddress.IPv4Address(line_list[1]))
+        subnet_size = subnet2_uint32 - subnet1_uint32
+        # calculate bitmask
+        subnet_mask = 32 - subnet_size.bit_length()
+        # is subnet not exact size of 2^n? verify using subnet_mask
+        p2 = (2**(32-subnet_mask))-1
+        if subnet_size != p2:
+            #print(f'Error: {line} is not a power of 2 {subnet_size} {subnet_mask} {p2}')
+            # Calculate next subnet
+            subnet_mask = subnet_mask + 1
+            subnets.append(f'{line_list[0]}/{subnet_mask}')
+            #print(f'Adding {line_list[0]}/{subnet_mask}')            
+            # Calculate next subnet
+            subnet1_uint32 = subnet1_uint32 + (2**(32-subnet_mask))
+            printable_subnet = str(ipaddress.IPv4Address(subnet1_uint32))
+            #print(f'Next subnet {printable_subnet}')
+            # if next subnet is not in range, break
+            if subnet1_uint32 > subnet2_uint32:
+                print(f'Error: Subnet {subnet1_uint32} is not in range {subnet2_uint32}')
+                break
+            line_list[0] = str(ipaddress.IPv4Address(subnet1_uint32))            
+        else:
+            # Add subnet to subnets
+            subnets.append(f'{line_list[0]}/{subnet_mask}')
+            break
+    return subnets 
+
+
+def main():
+    # argv[1] is the input file
+    # argv[2] is the output file
+    if len(sys.argv) != 3:
+        print("Usage: convert_tsv.py <input_file> <output_file>")
+        sys.exit(1)
+
+    # Open the input file
+    try:
+        input_file = open(sys.argv[1], 'r')
+    except IOError:
+        print("Error: Cannot open input file")
+        sys.exit(1)
+
+    # Open the output file
+    try:
+        output_file = csv.writer(open(sys.argv[2], 'w'), delimiter=',',doublequote=True,quoting=csv.QUOTE_ALL)
+    except IOError:
+        print("Error: Cannot open output file")
+        sys.exit(1)
+
+    # Read the input file line by line
+    for line in input_file:
+        # strip the newline at the end of the line
+        line = line.rstrip('\n')
+        # Split the line into a list by tabs
+        line_list = line.split('\t')
+        subnets = calculate_subnets(line_list)
+        for subnet in subnets:
+            #print(line_list[2] + '\t' + line_list[4] + '\t' + line_list[3] + '\t' + subnet)
+            # CSV
+            output_file.writerow([subnet, line_list[2], line_list[4], line_list[3]])
+        
+
+        # Write the output file
+        #output_file.write(str(subnet) + '\t' + line_list[2] + '\t' + line_list[4] + '\t' + line_list[3] + '\n')
+
+
+    input_file.close()
+
+if __name__ == '__main__':
+    main()
\ No newline at end of file
diff --git a/ips/get_asndb.sh b/ips/get_asndb.sh
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+++ b/ips/get_asndb.sh
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+#!/bin/sh
+# Retrieve the latest ASN database from github
+# curl https://raw.githubusercontent.com/ipverse/asn-ip/master/as/1234/ipv4-aggregated.txt
+
+# Set the path to the directory where the ASN database will be stored to script_dir
+script_dir=$(dirname "$0")
+cd $script_dir
+curl https://raw.githubusercontent.com/ipverse/asn-info/master/as.csv > as-info.csv
+if [ $? -eq 0 ]; then
+    echo "ASN-Info database updated successfully"
+else
+    echo "ASN-Info database update failed"
+fi
+
+# https://iptoasn.com/
+# https://iptoasn.com/data/ip2asn-v4.tsv.gz
+curl https://iptoasn.com/data/ip2asn-v4.tsv.gz | gunzip > ip2asn-v4.tsv
+if [ $? -eq 0 ]; then
+    echo "ASN database updated successfully"
+else
+    echo "ASN database update failed"
+fi
+
+#range_start range_end AS_number country_code AS_description
\ No newline at end of file