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+## ZONETEST(.py)
+
+Simple tool for testing if zone has been migrated successfully.
+
+#Requirements:
+- Python 3.x (it may run on 2.x after some corrections, I don't intend to test it)
+- dnspython python3 module
+- argparse python3 module (this is default package but still worth mentioning)
+- ipaddress python3 module (as above)
+
+#Parameters:
+./zonetest.py zonefile targetNS [--coma]
+
+- zonefile - DNS zone as downloaded from the "old" server. Assumed Bind RFC compat.
+- targetNS - our "new" name server onto which the zone has been migrated. Can be IP or URL.
+- --coma - optional switch allowing to parse csv files (default format is TAB separated)
+
+#Troubleshooting
+
+1) Script complains about missing dnspython
+
+Do `pip3 install dnspython`.
+Do not do pip3 as a root!
+
+2) pip3 fails with `ModuleNotFoundError: No module named 'pip._internal.cli.main'` or similar
+
+You are likely running system that provides Python without pip. There are some ways this can be corrected
+but the most recommended is via [pyenv](https://github.com/pyenv/pyenv) (this can be also done via Homebrew,
+please read the link!) 
+
+After installing pyenv just:
+
+`pyenv install [version]` - i.e. `pyenv install 3.9.0`
+`pyenv shell 3.9.0`
+
+All is in the docs.
+
+Further reading on python versions management:
+
+https://opensource.com/article/19/5/python-3-default-mac
+
diff --git a/zonetest.py b/zonetest.py
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+#!/usr/bin/env python3
+
+import argparse
+import dns.resolver
+import dns.exception
+import ipaddress
+
+def isIP(param):
+	try:
+		test = ipaddress.ip_address(param)
+		return True
+	except:
+		return False
+	
+params = argparse.ArgumentParser(description='Tester for after zone migration between servers.\nTakes a list of entries in the zone from zone file, queries old server and compares the output with given name server.',)
+params.add_argument('zonefile', metavar='FileName', action='store', help='Zone file parsed for entries to be checked.')
+params.add_argument('ns_server', metavar='NameServer', action='store', help='Target name server IP or URL')
+params.add_argument('--coma', action='store_true', required=False, help='Use coma as delimeter. Otherwise TAB is used. Optional parameter')
+args = params.parse_args()
+if (args.coma):
+	delimeter=','
+else:
+	delimeter='\t'
+# Loading zone
+try:
+	zfile=open(args.zonefile)
+except OSError as e:
+	print(e.strerror+": "+e.filename)
+	exit(e.errno)
+print("File loaded.")
+zone_content = []
+targetNS = ''
+if isIP(args.ns_server):
+	targetNS = args.ns_server
+else:
+	ipRes = dns.resolver.Resolver()
+	targetNS = str(ipRes.resolve(args.ns_server).response.answer[0][0])
+if (targetNS == ''):
+	print("Target name server given as URL ("+args.ns_server+") could not be resolved to IP address. Bailing out...")
+	exit(1)
+print("Target name server: "+targetNS)
+sourceNS = ''
+for line in zfile:
+	if line.strip().startswith(';'):
+		continue
+	if 'SOA' in line:
+		domain = line.split(delimeter)[0].removesuffix('.').strip()
+		print('Detected domain: '+domain)
+		continue;
+	parts = line.split(delimeter)
+	if len(parts) < 5:
+		continue
+	if parts[2].strip() == 'IN':
+		if parts[0].strip() == '@' and parts[3].strip() == 'NS':
+			if sourceNS == '':
+				srcCandidate = parts[4].strip().removesuffix('.')
+				if isIP(srcCandidate):
+					sourceNS = srcCandidate
+				else:
+					ipRes = dns.resolver.Resolver()
+					answer = ipRes.resolve(srcCandidate)
+					sourceNS = str(answer.response.answer[0][0])
+				if sourceNS == '':
+					print("Source name server found as URL ("+parts[4].strip().removesuffix('.')+") could not be resolved to IP address. Bailing out...")
+					exit(1)
+				print("Found \"old\" name server: "+sourceNS)
+			continue
+		zone_content.append(line.strip())
+zfile.close()
+RTypes = {'A':1, 'A6':38, 'AAAA':28, 'AFSDB':18, 'ANY':255, 'APL':42, 'AVC':258, 'AXFR':252, 'CAA':257, 'CDNSKEY':60, 'CDS':59, 'CERT':37, 'CNAME':5, 'CSYNC':62, 'DHCID':49, 'DLV':32769, 'DNAME':39, 'DNSKEY':48, 'DS':43,
+			'EUI48':108, 'EUI64':109, 'GPOS':27, 'HINFO':13, 'HIP':55, 'IPSECKEY':45, 'ISDN':20, 'IXFR':251, 'KEY':25, 'KX':36, 'LOC':29, 'MAILA':254, 'MAILB':253, 'MB':7, 'MD':3, 'MF':4, 'MG':8, 'MINFO':14, 'MR':9,
+			'MX':15, 'NAPTR':35, 'NONE':0, 'NS':2, 'NSAP':22, 'NSEC':47, 'NSEC3':50, 'NSEC3PARAM':51, 'NULL':10, 'NXT':30, 'OPT':41, 'PTR':12, 'PX':26, 'RP':17, 'RRSIG':46, 'RT':21, 'SIG':24, 'SOA':6, 'SPF':99, 'SRV':33,
+			'SSHFP':44, 'TA':32768, 'TKEY':249, 'TLSA':52, 'TSIG':250, 'TXT':16, 'UNSPEC':103, 'URI':256, 'WKS':11, 'X25':19}
+# ALl vars known, setting up the dns resolvers
+oldDNS = dns.resolver.Resolver()
+oldDNS.nameservers = [ sourceNS ]
+newDNS = dns.resolver.Resolver()
+newDNS.nameservers = [ targetNS ]
+# Good to go. Processing...
+total = str(len(zone_content))
+counter = 0;
+print("Setup complete. Processing "+total+" entries...")
+for line in zone_content:
+	counter = counter+1
+	if line.startswith('*') or line.startswith('@'):
+		continue
+	parts = line.split(delimeter)
+	print("Testing ("+str(counter)+"/"+total+") "+parts[3].strip()+" record "+parts[0].strip()+": ",end='')
+	print(parts[0].strip()+"."+domain,end=' ')
+	try:
+		oldpart = oldDNS.resolve(parts[0].strip()+"."+domain,RTypes[parts[3].strip()]).response.answer[0][0]
+	except dns.exception.DNSException as e:
+		print("[FAILED - source DNS]")
+		print(e.msg)
+		continue
+	try:
+		newpart = newDNS.resolve(parts[0].strip()+'.'+domain,RTypes[parts[3].strip()]).response.answer[0][0]
+	except dns.exception.DNSException as e:
+		print("[FAILED - target DNS]")
+		print(e.msg)
+		continue
+	if oldpart == newpart:
+		print("[CORRECT]")
+	else:
+		print("[FAILED]")
+		print("Old record: "+oldpart)
+		print("New record: "+newpart)
+print("Finished.")