Open-Source Security · honmashironeko

ProxyCat

ProxyCat is a Python-based proxy pool middleware that converts short-lived static proxy IPs into fixed tunnel IPs, enabling persistent proxy services via HTTP/SOCKS5 protocols. It runs on cloud or local infrastructure with automatic IP rotation, health checking, and a web management UI.

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Source: GitHub — github.com/honmashironeko/ProxyCat

2.5k

GitHub stars

264

Forks

Python

Primary language

GPL-2.0

License (OSI-approved)

Key facts

Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.

Field	Value
Repository	honmashironeko/ProxyCat
Owner	honmashironeko
Primary language	Python
License	GPL-2.0 — OSI-approved
Stars	2.5k
Forks	264
Open issues	5
Latest release	ProxyCat-V2.0.4 (2025-04-01)
Last updated	2025-05-26
Source	https://github.com/honmashironeko/ProxyCat

What ProxyCat is

The tool acts as a proxy aggregation layer, accepting HTTP and SOCKS5 inbound connections and routing them through configurable backend proxies (HTTP/HTTPS/SOCKS5). It includes automatic proxy validation on startup, dynamic IP fetching via GetIP functions, and intelligent switching on proxy failure. Configuration is managed via config.ini with optional dynamic reload without service restart.

Quickstart

Get the ProxyCat source

Clone the repository and explore it locally.

terminalbash

1git clone https://github.com/honmashironeko/ProxyCat.git2cd ProxyCat3# follow the project's README for install & configuration

Need it deployed, integrated, or customized instead? DEV.co ships production installs.

Best use cases

Penetration Testing & Red Team Operations

Deploy to obfuscate operator IP address during authorized security assessments. GetIP functions and flexible rotation modes reduce detection risk when chaining requests through multiple backend proxies.

Cost-Optimized Proxy Infrastructure

Aggregate low-cost short-lived residential or datacenter IPs (0.2–3 CNY/day) into a fixed endpoint service. Amortize frontend IP cost across multiple backend sources with automatic failover.

Web Scraping with IP Rotation

Provide a single stable listening address (localhost:port or fixed domain) while rotating backend proxies on configurable request intervals. Simplifies client-side code and improves anti-detection resilience.

Implementation considerations

Review config.ini thoroughly: port bindings, authentication credentials (username/password), and upstream proxy lists before production deployment. Misconfiguration can leak traffic or expose proxies.
Plan upstream IP provisioning strategy. Tool does not fetch IPs autonomously; you must supply static IP addresses or integrate a separate IP source (API, database, or manual list).
Deploy behind a firewall or private network if possible. Public exposure of proxy ports risks unauthorized access and abuse without robust authentication and rate-limiting.
Monitor logs and web UI dashboards for failed upstream proxies and rotation behavior. Ensure GetIP function calls do not exceed upstream provider rate limits.
Test full flow (inbound client → ProxyCat → upstream proxy → target) in staging before production. Validate that protocol negotiation (HTTP vs. SOCKS5) and auth work end-to-end.

When to avoid it — and what to weigh

Legitimate HTTPS Encryption Requirement — ProxyCat listens for HTTP and SOCKS5 but does not clearly document TLS/SSL termination for HTTPS inbound traffic. If clients require encrypted proxy connections, security review is required.
Compliance-Sensitive or Regulated Environments — The tool is explicitly designed for IP obfuscation in penetration testing contexts. Use in payment processing, healthcare, financial, or enterprise environments without legal and security review introduces liability and policy violations.
GPL-2.0 Source Code Restrictions in Proprietary Products — GPL-2.0 requires that any derivative or linked proprietary software be released under GPL-2.0 or compatible open licenses. Embedding in closed-source commercial products is problematic without dual licensing.
High-Throughput, Low-Latency Scenarios — No performance benchmarks or throughput guarantees are documented. Python-based implementation may introduce latency overhead unsuitable for microsecond-critical proxy use cases.

License & commercial use

GPL-2.0 (GNU General Public License v2.0). This is a copyleft open-source license. Any modifications, extensions, or derivative works must be released under GPL-2.0 or a compatible license. Commercial use is allowed, but source code distribution obligations apply.

GPL-2.0 permits commercial use but requires that any proprietary modifications or linked software also be released under GPL-2.0 or compatible terms. If you plan to offer ProxyCat as a managed service or embed it in a closed-source product, consult legal counsel. The license does not restrict service provision, but does restrict proprietary forks.

DEV.co evaluation signals

Editorial assessment — not user reviews. Directional, with an explicit confidence level.

Signal	Assessment
Maintenance	Active
Documentation	Adequate
License clarity	Clear
Deployment complexity	Moderate
DEV.co fit	Possible
Assessment confidence	High

Security considerations

The tool transparently forwards authentication credentials (username/password) to upstream proxies; ensure upstream connections use HTTPS or VPN-style encryption to avoid plaintext credential leakage. IP rotation helps conceal operator patterns but does not anonymize application-layer identifiers (User-Agent, headers, TLS fingerprints). No documented encryption for ProxyCat ↔ upstream proxy links. Blacklist/whitelist features help restrict misuse, but public-facing deployment without strong auth creates DDoS and credential enumeration risk. Code audit of GetIP integration and proxy selection logic recommended before deployment in security-sensitive contexts.

Alternatives to consider

Tinyproxy (C, lightweight)

Simpler, smaller footprint. No dynamic IP rotation, but suitable if you manage rotation externally or need a minimal forward proxy for static upstreams.

Squid (C, enterprise-grade)

Battle-tested caching proxy with extensive logging, ACLs, and authentication. No built-in IP rotation, but integrates well with external orchestration and has stronger TLS support.

Shadowsocks / V2Ray (Go/C++, privacy-focused)

Encrypted tunnel proxies with obfuscation. Designed for privacy rather than IP rotation, but avoid IP-based detection through encryption. Heavier configuration learning curve.

Software development agency

Build on ProxyCat with DEV.co software developers

ProxyCat offers Docker-ready IP rotation for penetration testing and scraping use cases. Review GPL-2.0 licensing, upstream proxy integration, and security posture with your team before production deployment.

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ProxyCat FAQ

Does ProxyCat automatically fetch and update proxy IP lists?

No. You must supply upstream proxy IP addresses via config or API. The GetIP function can be integrated with an external IP provider, but ProxyCat does not autonomously crawl or maintain free proxy lists.

Can I use ProxyCat in a commercial or SaaS proxy service?

GPL-2.0 permits commercial use. If you offer ProxyCat as a managed service (without code modification), you can charge for hosting. If you modify the source code, any customer-facing product must also be licensed under GPL-2.0 or compatible terms. Consult legal counsel for dual-licensing options.

What happens if all upstream proxies fail?

Documentation indicates automatic proxy switching and failure detection, but specific fallback behavior (retry, queue, error response) is not clearly stated. Requires code or operational manual review.

Does ProxyCat encrypt communication between itself and upstream proxies?

Not clearly documented. It forwards HTTP/HTTPS/SOCKS5 requests to upstream proxies. If upstream proxies are unencrypted or over untrusted networks, credentials and traffic metadata are exposed. Deploy over VPN or private network for sensitive use cases.

Software development & web development with DEV.co

From first prototype to production, DEV.co delivers software development services around tools like ProxyCat. Our software development agency staffs experienced software developers and web developers for custom software development, web development, integrations, and ongoing support across open-source security and beyond.

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