If you've ever tried writing your own web crawler, you've likely encountered this situation: after sending a few hundred requests, you suddenly receive a 403 error or CAPTCHA page—your IP has been flagged.
Below is an explanation of why and how proxy IPs solve this problem.
What exactly does a proxy do?
A proxy server is set up between your crawler and the target website. The website doesn't see your real IP, but rather the proxy's IP. This simple forwarding layer is the foundation of sustainable web scraping.
Why You Can't Use Only One IP for Scraping
Modern websites use multiple methods to detect crawlers—network layer, TLS fingerprinting, browser characteristics, behavioral patterns, etc. If thousands of requests come from the same IP, it will quickly be blocked. The network layer alone checks IP reputation databases, and IPs from cloud service providers like AWS are often blocked by default on high-security websites.
Two Main Types of Web Scraping Proxy
Data Center Proxy: Fast, low price, suitable for large-volume tasks. The disadvantage is that the IP comes from a data center, making it easily identified by advanced anti-scraping systems.
Residential Proxy: Uses real IP addresses assigned by ISPs to ordinary home devices, appearing as genuine user traffic and making it harder to block. Success rates can reach 95%-99% on protected domains. The downsides are slower speed and higher price.
Key Practice: IP Rotation
Using a single proxy IP is practically the same as not using one. The real power comes from IP rotation—automatically switching IPs on each request or at fixed intervals. This distributes traffic across a large number of addresses, making it almost impossible for the target website to detect a pattern.
Summary
If you are conducting large-scale data scraping, proxy IPs are not an option, but rather infrastructure. For targets with weak protection, choose data center proxies for speed and cost; for websites with strong protection, use residential proxies to avoid being blocked. Regardless of the approach, always implement proper rotation.
Below is an explanation of why and how proxy IPs solve this problem.
What exactly does a proxy do?
A proxy server is set up between your crawler and the target website. The website doesn't see your real IP, but rather the proxy's IP. This simple forwarding layer is the foundation of sustainable web scraping.
Why You Can't Use Only One IP for Scraping
Modern websites use multiple methods to detect crawlers—network layer, TLS fingerprinting, browser characteristics, behavioral patterns, etc. If thousands of requests come from the same IP, it will quickly be blocked. The network layer alone checks IP reputation databases, and IPs from cloud service providers like AWS are often blocked by default on high-security websites.
Two Main Types of Web Scraping Proxy
Data Center Proxy: Fast, low price, suitable for large-volume tasks. The disadvantage is that the IP comes from a data center, making it easily identified by advanced anti-scraping systems.
Residential Proxy: Uses real IP addresses assigned by ISPs to ordinary home devices, appearing as genuine user traffic and making it harder to block. Success rates can reach 95%-99% on protected domains. The downsides are slower speed and higher price.
Key Practice: IP Rotation
Using a single proxy IP is practically the same as not using one. The real power comes from IP rotation—automatically switching IPs on each request or at fixed intervals. This distributes traffic across a large number of addresses, making it almost impossible for the target website to detect a pattern.
Summary
If you are conducting large-scale data scraping, proxy IPs are not an option, but rather infrastructure. For targets with weak protection, choose data center proxies for speed and cost; for websites with strong protection, use residential proxies to avoid being blocked. Regardless of the approach, always implement proper rotation.
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