Automatically download nameserver list

.gitignore

@@ -1,2 +1,3 @@
 *.log
 nameservers
+nameservers.head

filter_subdomains.sh

@@ -1,5 +1,12 @@
 #!/usr/bin/env bash
 
+# Get a list of nameservers
+
+rm -f nameservers
+touch nameservers
+[ -f nameservers.head ] && cat nameservers.head >> nameservers
+curl https://public-dns.info/nameservers.txt | sort -R >> nameservers
+
 # Filter out the subdomains not pointing to a first-party tracker
 
 cat subdomains/*.list | sort -u > temp/all_subdomains.list