Blacklist Checker

What the blacklist checker queries

Enter an IPv4 address and our server asks three real-time DNS blocklists whether it is listed: Spamhaus ZEN, SpamCop and Barracuda. Each list answers through DNS, so the check takes a second and the result is live.

Each list is reported as listed, clean, or unknown. Unknown means the list didn't give a usable answer, for example because it refuses queries that arrive through shared or cloud DNS resolvers (Spamhaus does this). It doesn't mean the address is listed.

What a listing means for a proxy

These lists track addresses seen sending spam or infected traffic, and mail servers use them to reject email. A listing matters less for web browsing or scraping, but some sites feed the same data into their own risk scoring, so a listed exit can see more blocks or captchas. With rotating proxies, simply take the next address.

Questions