What is the HBL?
What is the Hash Blocklist (HBL)?
What is the Spamhaus Hash Blocklist (HBL)?
To build the HBL, our software analyzes incoming messages, identifies and normalizes suspect content elements, and for each of them produces a cryptographic hash. That hash is then published as part of the HBL.
- The HBL is a collection of hashes of malicious or suspicious message elements or “tokens.”
- It stores and queries each token as a cryptographic hash, where each hash is unique to each token.
- HBL elements include email addresses, cryptocurrency wallets, URLs, and both malicious and suspicious files (separate categories).
- More in-depth technical information can be found in the Spamhaus Technology Ltd documentation of the HBL.