Content-based
- Blacklist/Whitelist
- Content filtering
- Bayesian
- URL database
- Challenge/Response
- IBF (intent based filtering)
IP-based
- RBL (realtime blackhole list)
- MX/DNS lookup
Pattern-based
- DCC (distributed checksum clearinghouse)
- RPD (recurrent pattern detection)
- SLS (statistical lookup service)
Did I miss any? If so, please email additional classifications to "webmaster" of this domain.
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