IPQS Proxy Detection Database vs Spamhaus Policy Blocklist (PBL): Side-by-Side Comparison (2026)

IPQS Proxy Detection Database: Database for detecting proxies, VPNs, Tor nodes, and high-risk IP addresses. built by ipqualityscore. Core capabilities include Hourly database updates, Proxy and VPN detection, Tor exit node identification..

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..

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

IPQS Proxy Detection Database differentiates with Hourly database updates, Proxy and VPN detection, Tor exit node identification. 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.

IPQS Proxy Detection Database is developed by ipqualityscore. Spamhaus Policy Blocklist (PBL) is developed by Spamhaus. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

IPQS Proxy Detection Database and Spamhaus Policy Blocklist (PBL) serve similar Threat Intel Feeds use cases: both are Threat Intel Feeds tools, both cover Botnet, IP Lookup. Key differences: IPQS Proxy Detection Database is Commercial while Spamhaus Policy Blocklist (PBL) is Free. Review the feature comparison above to determine which fits your requirements.