IP Blacklist Check (RBL)
Checks whether an IP is on well-known email blacklists — useful for mail servers.
Frequently Asked Questions
What is a blacklist (RBL/DNSBL)?
It is a list of IP addresses known for sending spam or malicious activity. Mail servers use these lists to reject or flag email.
What if my IP is blacklisted?
Visit that list's website and request delisting, and fix the root cause (such as spam or infection) so it does not get relisted.
Why not judge by a single list?
Some lists are stricter or outdated; checking several reputable lists gives a more accurate picture of the IP's reputation.