Tail Certificate Transparency logs and extract hostnames.
This utility is an alternative to using hosted services like crt.sh or CertStream.
Usage:
$ go run github.com/hdm/ctail@latest -f -m '^autodiscover\.'Logs are written to standard error and results are formatted as NDJSON/JSONL and written to standard output.
The output can be filtered using using tools like jq.
Duplicate records are common and you might consider using a bloom filter in the pipeline.