Freedom251 › Internet Filtering Software
ufdbGuard
What ufdbGuard is
ufdbGuard for Squid is an open-source URL filter for the Squid web proxy. It uses blacklists and URL categories to block unwanted sites, including adult content, ads, gambling, malware, social networks, web proxies, and DNS-over-HTTPS. Squid and ufdbGuard can run on one server or separate servers, without extra workstation software. The filter is intended to help guard against proxy tunnels, SSH tunnels, unauthorized VPNs, and similar firewall-bypass tools. It can probe HTTPS URLs for proxy tunnels and require a hostname with an officially signed certificate. Custom blocklists, safe-search controls, filtering schedules, and advanced activity reports are listed. A related query plugin filters DNS requests inside BIND, while the C/C++ API supports third-party integrations. The product supports Linux, Squid, and BIND, offers a free plan and fully functional 60-day trial, and sells per-user URL database subscriptions. Headquarters are in Doorwerth, Netherlands.
Who it suits
ufdbGuard suits organizations running Linux with Squid or BIND that need category filtering, scheduled controls, and proxy-tunnel defenses. Its API also suits developers integrating URL classification into applications.
What it does well
- Open-source filter designed for Squid
- Blocks sites by URL categories
- Supports custom blocklists and safe search
- Filtering schedules and advanced reports
- Free plan and 60-day trial
What to know first
- Requires Squid, Linux, or BIND environment
- Subscriptions are billed per user
- Paid prices exclude VAT and other taxes
- Over-2000-user price requires a quote
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| ufdbGuard for Squid URL database subscription (11–50 users) | 12-month subscription; per user; exclusive of VAT and other taxes · 11–50 users | €10 a year |
| ufdbGuard for Squid URL database subscription (6–10 users) | 12-month subscription; per user; exclusive of VAT and other taxes · 6–10 users | €12 a year |
| ufdbGuard for Squid URL database subscription (1001–2000 users) | 12-month subscription; per user; exclusive of VAT and other taxes · 1001–2000 users | €3.95 a year |
| ufdbGuard for Squid URL database subscription (501–1000 users) | 12-month subscription; per user; exclusive of VAT and other taxes · 501–1000 users | €4.95 a year |
| ufdbGuard for Squid URL database subscription (201–500 users) | 12-month subscription; per user; exclusive of VAT and other taxes · 201–500 users | €5.95 a year |
| ufdbGuard for Squid URL database subscription (51–200 users) | 12-month subscription; per user; exclusive of VAT and other taxes · 51–200 users | €8 a year |
| ufdbGuard for Squid URL database subscription (over 2000 users) | Quote required; prices are in EURO and exclusive of VAT and other taxes · Over 2000 users | On request |
As urlfilterdb.com lists them, read 11 Oct 2026. The maker's own page has the final word.
Verdict
ufdbGuard combines category-based URL filtering with controls for tunnels and firewall bypasses. It offers a free option and trial, while larger deployments can use priced URL database subscriptions.
Facts from ufdbGuard's own pages
- API
- The ufdbGuard API is a C/C++ library for integrating URL classification into third-party applications. · urlfilterdb.com, 11 Oct 2026
- Categories
- The URL database includes categories such as adult content, ads, gambling, malware, social networks, web proxies, and DNS-over-HTTPS. · urlfilterdb.com, 11 Oct 2026
- Database updates
- The maker says unidentified URLs can be recognized, uploaded for analysis, and added to the URL database. · urlfilterdb.com, 11 Oct 2026
- Deployment
- Squid and ufdbGuard can run on the same server or separate servers, with no additional workstation software required. · urlfilterdb.com, 11 Oct 2026
- Download platforms
- The download page lists RPM packages for RHEL, Rocky Linux, and AlmaLinux 8 and 9, and DEB packages for Ubuntu 20.04, 22.04, and 24.04. · urlfilterdb.com, 11 Oct 2026
- Filtering method
- ufdbGuard for Squid uses blacklists to block unwanted websites based on URL categories. · urlfilterdb.com, 11 Oct 2026
- Headquarters
- Doorwerth, Netherlands · urlfilterdb.com, 28 Sept 2026
- HTTPS controls
- The maker says ufdbGuard can probe HTTPS URLs for proxy tunnels and can be configured to require a hostname and an officially signed certificate. · urlfilterdb.com, 11 Oct 2026
- Integration
- The free Squid version can use URLfilterDB's licensed URL database or any free text-based URL database. · urlfilterdb.com, 11 Oct 2026
- Privacy
- The maker states that its products do not track users and only track new URLs missing from the database plus statistical counters. · urlfilterdb.com, 11 Oct 2026
- Purpose
- ufdbGuard for Squid is an open-source URL filter designed to work with the Squid web proxy. · urlfilterdb.com, 11 Oct 2026
- Related integration
- A separate ufdbGuard query plugin filters DNS queries inside the BIND named server and can use user-defined URL categories. · urlfilterdb.com, 11 Oct 2026
- Security
- The product helps guard against proxy tunnels, SSH tunnels, unauthorized VPNs, and other tools that use a web proxy to bypass firewalls. · urlfilterdb.com, 11 Oct 2026
- Support
- The maker says it supports installation and usage questions even from users without a URL database license, and currently supports ufdbGuard 1.35.1 and newer. · urlfilterdb.com, 11 Oct 2026
- Trial
- The maker offers a fully functional 60-day trial license for the URL filtering solution. · urlfilterdb.com, 11 Oct 2026
Where ufdbGuard stands on Freedom251
- Internet Filtering Software#21 of 65