diff --git a/README.md b/README.md
index b732fa9..d6e0a36 100644
--- a/README.md
+++ b/README.md
@@ -42,6 +42,7 @@ Just to build the list, you can find an already-built list in the releases.
 - Selenium
 - seleniumwire
 - dnspython
+- [progressbar2](https://pypi.org/project/progressbar2/)
 
 And then just run `eulaurarien.sh`.
 
diff --git a/collect_subdomains.py b/collect_subdomains.py
index 4177812..26c50c7 100755
--- a/collect_subdomains.py
+++ b/collect_subdomains.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python3
+# pylint: disable=C0103
 
 """
 From a list of URLs, output the subdomains
@@ -9,6 +10,7 @@ import sys
 import typing
 import urllib.parse
 
+import progressbar
 import selenium.webdriver.firefox.options
 import seleniumwire.webdriver
 
@@ -38,10 +40,26 @@ def collect_subdomains(url: str) -> typing.Iterable[str]:
     driver.close()
 
 
+def collect_subdomains_standalone(url: str) -> None:
+    url = url.strip()
+    if not url:
+        return
+    for subdomain in collect_subdomains(url):
+        print(subdomain)
+
+
 if __name__ == '__main__':
-    for line in sys.stdin:
-        line = line.strip()
-        if not line:
-            continue
-        for subdomain in collect_subdomains(line):
-            print(subdomain)
+    assert len(sys.argv) <= 2
+    filename = None
+    if len(sys.argv) == 2 and sys.argv[1] != '-':
+        filename = sys.argv[1]
+        num_lines = sum(1 for line in open(filename))
+        iterator = progressbar.progressbar(open(filename), max_value=num_lines)
+    else:
+        iterator = sys.stdin
+
+    for line in iterator:
+        collect_subdomains_standalone(line)
+
+    if filename:
+        iterator.close()
diff --git a/eulaurarien.sh b/eulaurarien.sh
index 88cfc14..d6e3a0e 100755
--- a/eulaurarien.sh
+++ b/eulaurarien.sh
@@ -3,11 +3,11 @@
 # Main script for eulaurarien
 
 # Get all subdomains accessed by each website in the website list
-cat websites.list | ./collect_subdomains.py > subdomains.list
+./collect_subdomains.py websites.list > subdomains.list
 sort -u subdomains.list > subdomains.sorted.list
 
 # Filter out the subdomains not pointing to a first-party tracker
-cat subdomains.sorted.list | ./filter_subdomains.py > toblock.list
+./filter_subdomains.py subdomains.sorted.list > toblock.list
 sort -u toblock.list > toblock.sorted.list
 
 # Format the blocklist so it can be used as a hostlist
diff --git a/filter_subdomains.py b/filter_subdomains.py
index fd3a590..d630b1a 100755
--- a/filter_subdomains.py
+++ b/filter_subdomains.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python3
+# pylint: disable=C0103
 
 """
 From a list of subdomains, output only
@@ -9,6 +10,7 @@ import re
 import sys
 
 import dns.resolver
+import progressbar
 
 import regexes
 
@@ -18,7 +20,10 @@ def is_subdomain_matching(subdomain: str) -> bool:
     Indicates if the subdomain redirects to a first-party tracker.
     """
     # TODO Look at the whole chain rather than the last one
-    query = dns.resolver.query(subdomain, 'A')
+    try:
+        query = dns.resolver.query(subdomain, 'A')
+    except dns.resolver.NXDOMAIN:
+        return False
     canonical = query.canonical_name.to_text()
     for regex in regexes.REGEXES:
         if re.match(regex, canonical):
@@ -26,10 +31,29 @@ def is_subdomain_matching(subdomain: str) -> bool:
     return False
 
 
+def is_subdomain_matching_standalone(subdomain: str) -> None:
+    """
+    Print the subdomain if it redirects to a first-party tracker.
+    """
+    subdomain = subdomain.strip()
+    if not subdomain:
+        return
+    if is_subdomain_matching(subdomain):
+        print(subdomain)
+
+
 if __name__ == '__main__':
-    for line in sys.stdin:
-        line = line.strip()
-        if not line:
-            continue
-        if is_subdomain_matching(line):
-            print(line)
+    assert len(sys.argv) <= 2
+    filename = None
+    if len(sys.argv) == 2 and sys.argv[1] != '-':
+        filename = sys.argv[1]
+        num_lines = sum(1 for line in open(filename))
+        iterator = progressbar.progressbar(open(filename), max_value=num_lines)
+    else:
+        iterator = sys.stdin
+
+    for line in iterator:
+        is_subdomain_matching_standalone(line)
+
+    if filename:
+        iterator.close()