Spamhaus Policy Blocklist (PBL) vs Webz.io: Side-by-Side Comparison (2026)

Spamhaus Policy Blocklist (PBL): DNSBL of end-user IP ranges that should not send email directly to MX servers. built by Spamhaus. Core capabilities include Real-time DNSBL query service for blocking unauthorized SMTP connections by IP, Covers 1.4B+ IPv4 addresses (~40% of routable IPv4 space) in CIDR format, Includes both dynamic and static end-user IP ranges from ISPs and network operators..

Webz.io: Web data platform providing open, deep & dark web APIs and monitoring. built by Webz.io. Core capabilities include Dark Web API for accessing deep and dark web data, Data Breach Detection API for identifying exposed credentials and breached data, Open Web APIs covering news, blogs, forums, and reviews..

Both serve the Threat Intel Feeds market but differ in approach, feature depth, and target audience.

Spamhaus Policy Blocklist (PBL) differentiates with Real-time DNSBL query service for blocking unauthorized SMTP connections by IP, Covers 1.4B+ IPv4 addresses (~40% of routable IPv4 space) in CIDR format, Includes both dynamic and static end-user IP ranges from ISPs and network operators. Webz.io differentiates with Dark Web API for accessing deep and dark web data, Data Breach Detection API for identifying exposed credentials and breached data, Open Web APIs covering news, blogs, forums, and reviews.

Spamhaus Policy Blocklist (PBL) is developed by Spamhaus. Webz.io is developed by Webz.io founded in 2015-01-01T00:00:00.000Z. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

Spamhaus Policy Blocklist (PBL) and Webz.io serve similar Threat Intel Feeds use cases: both are Threat Intel Feeds tools. Key differences: Spamhaus Policy Blocklist (PBL) is Free while Webz.io is Commercial. Review the feature comparison above to determine which fits your requirements.