lazydns

Reverse Lookup Plugin

reverse_lookup maintains a small in-memory mapping of IP -> owner name populated from A/AAAA answers and can answer PTR queries from cache when enabled.

Args

• size (int): approximate cache capacity.
• handle_ptr (bool): respond to PTR queries from cache.
• ttl (int): max TTL applied to cached entries.

Behavior

• Call save_ips_after (or include plugin after response) to record IP->name mappings.
• When handle_ptr is enabled the plugin will return PTR answers for reverse queries if a cached mapping exists and is unexpired.

When to use

• Use to provide fast PTR replies for hosts discovered via normal queries, useful in local networks.
• Combine with plugins like hosts or forwarder to build dynamic reverse resolution without static PTR records.

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