Generate catalog zone PTR records

mk-ptr.py

#!/usr/local/bin/python3.7

# Jan-Piet Mens, 2020-OCT-21

import dns.name   # pip install dnspython
import hashlib
import sys

if __name__ == '__main__':
    if len(sys.argv) < 2:
        print("Usage: {0} domain-name [domain-name ..]".format(sys.argv[0]), file=sys.stderr)
        exit(2)

    for domain in sys.argv[1:]:
        fqdn = dns.name.from_text(domain)

        h = hashlib.sha1(dns.name.from_text(domain).to_wire()).hexdigest()
        print("{0}.zones\t\tPTR {1}".format(h, fqdn))

$ mk-ptr.py example.com example.org
c5e4b4da1e5a620ddaa3635e55c3732a5b49c7f4.zones          PTR example.com.
47ac1a4d93b61fffdb4762c18c9e7d1a6b046d33.zones          PTR example.org.