Can do all with one argument, and includes start and end timestamps.

dns_compare.py

@@ -4,6 +4,7 @@ import argparse
 import json
 import os
 import time
+from datetime import datetime
 from concurrent.futures import ThreadPoolExecutor
 from dns import message
 from dns import query
@@ -28,7 +29,7 @@ builtin_nameservers = {
 parser = argparse.ArgumentParser()
 parser.add_argument('--domain', help='Helps if all records to query are on the same domain.')
 parser.add_argument('--nameservers', nargs='+', help='IPv4 or IPv6 address of nameserver(s) to be queried.')
-parser.add_argument('--ns-builtin', nargs='+', help=f'Built-in public DNS servers. Options: {", ".join(builtin_nameservers.keys())}')
+parser.add_argument('--ns-builtin', nargs='+', help=f'Built-in public DNS servers. Options: {", ".join(builtin_nameservers.keys())}, all')
 parser.add_argument('--records', nargs='*', help='Hostname(s) to query. If not provided with --domain, queries the domain itself.')
 parser.add_argument('--record-type', default='A', help='DNS record type to query. Default: A')
 parser.add_argument('--list-record-types', action='store_true', help='Print list of supported record types and exit.')
@@ -40,15 +41,19 @@ builtin_providers = []  # list of provider keys used
 
 # Resolve builtin nameservers to actual IPs
 if args.ns_builtin:
-    for provider in args.ns_builtin:
-        if provider.lower() not in builtin_nameservers:
+    # Handle 'all' special case
+    if 'all' in [p.lower() for p in args.ns_builtin]:
+        builtin_providers = list(builtin_nameservers.keys())
+    else:
+        builtin_providers = [p.lower() for p in args.ns_builtin]
+    
+    for provider in builtin_providers:
+        if provider not in builtin_nameservers:
             print(f"Error: Unknown DNS provider '{provider}'")
-            print(f"Available providers: {', '.join(builtin_nameservers.keys())}")
+            print(f"Available providers: {', '.join(builtin_nameservers.keys())}, all")
             exit(1)
-        provider_key = provider.lower()
-        builtin_providers.append(provider_key)
-        for ip in builtin_nameservers[provider_key]:
-            nameserver_map[ip] = provider_key
+        for ip in builtin_nameservers[provider]:
+            nameserver_map[ip] = provider
 
 # Track manual nameservers separately
 manual_nameservers = []
@@ -101,6 +106,7 @@ def perform_query(full_domain, ns, record_type):
 
 # Start timer
 start_time = time.time()
+start_time_iso = datetime.fromtimestamp(start_time).isoformat()
 
 # Determine what to query
 if args.domain:
@@ -171,8 +177,13 @@ for full_domain in full_domains:
             if (full_domain, ns) in results_map:
                 output[full_domain]["records"][ns] = results_map[(full_domain, ns)]
 
-# Calculate and add runtime
-elapsed_time = time.time() - start_time
+# Calculate and add timing information
+end_time = time.time()
+end_time_iso = datetime.fromtimestamp(end_time).isoformat()
+elapsed_time = end_time - start_time
+
+output["start_time"] = start_time_iso
+output["end_time"] = end_time_iso
 output["runtime"] = f"{elapsed_time:.2f}s"
 
 print(json.dumps(output, indent=4))