Run bulk health checks on a proxy list before scraping

Quick answer

A scraping job is only as reliable as its proxies. Feed it dead, flagged, or blacklisted proxies and you get failures, blocks, and bad data. Auditing a proxy list before you run saves hours of debugging. Here’s a practical pre-flight check.

What to check on each proxy

For every proxy IP, you want to know: is it alive and reachable, what’s its real geolocation and network owner, is it a datacenter or residential IP, and is it on any blocklist. A proxy that’s technically working but blacklisted or obviously a datacenter IP will get blocked by the target anyway — better to drop it before the run.

Step 1: Reputation and network audit

Run your proxy IPs through our Bulk IP Audit tool to get reverse DNS, blocklist status, and the ASN/geolocation for each. A proxy already on a blocklist is a liability; a “residential” proxy whose ASN is actually a datacenter is mislabelled and will be treated as one by anti-bot systems. Drop both.

Step 2: Watch for the residential/datacenter mismatch

Proxy sellers often overstate quality. The ASN tells the truth: if a list sold as “residential” resolves to hosting ASNs, you’re paying residential prices for datacenter IPs that targets will block. Auditing the network owner up front protects you from that. See datacenter vs residential blocklists for why the distinction matters so much.

Step 3: Check for leaks if anonymity matters

If the scrape needs to look like organic traffic, a proxy that leaks your real IP or ASN defeats the purpose. Proxies suffer the same WebRTC/DNS/IPv6 leaks as VPNs — see why proxies leak your true ASN. For browser-based scraping, verify with our WebRTC Leak Test.

Step 4: Automate the pre-flight

For large pools, make the audit part of your pipeline: before each run, script a health check that drops dead, blacklisted, or mis-typed proxies automatically. Our developer endpoints support this, and a Python bulk-audit script gives you a template to check geolocation and blocklist status across the whole pool asynchronously.

A note on responsible use

Audit proxies for reliability and your own privacy, and scrape within the terms and laws that apply to your targets — respect robots.txt, rate limits, and applicable regulations. A clean proxy list doesn’t make an abusive scrape acceptable.