Blacklist Checker
Check whether an IP address or a domain's mail server is listed on DNS blocklists.
Related tools
- MX & SMTPCheck a domain's mail servers and test SMTP connections, STARTTLS and open relay.
- Email SecurityCheck SPF, DKIM, DMARC, MTA-STS, TLS-RPT and BIMI for a domain and get the records to fix them.
- IP IntelligenceLook up an IP address's network, ASN, reverse DNS and approximate location, or show your own.
- DNS LookupLook up DNS records by type, including reverse (PTR) lookups for IP addresses.
About this tool
Check whether an IP address or a domain's mail server is listed on DNS blocklists.
XGM queries 48 IP blocklists and 12 domain blocklists (DNSBL, URIBL, SURBL) over DNS from the XGM server. For a domain it checks the name and up to five IPv4 addresses from its A and MX records. Only IPv4 is supported. 127.0.0.2 is the standard test address that every list reports as listed. Network context for a typed-in IP (reverse DNS, network owner, hosting network) comes from the XGM server and ipwho.is.
How to use it
- Open the Blacklist Checker tool.
- Enter the public domain, hostname or IP address you want to check.
- Run the check; XGM queries it from its server and lists the findings.
- Copy the output only after checking it looks correct.
- Use related XGM tools if you need a broader diagnostic view.
FAQ
Is the Blacklist Checker free to use?
Yes. The blacklist checker is free and works without creating an account.
Does XGM store my input for Blacklist Checker?
Browser-side utilities process input locally. Server checks send only the domain, host or IP you enter to the XGM API and do not store it.
Can I use Blacklist Checker for production checks?
Yes, use it for quick validation and troubleshooting. For critical changes, confirm the result with your official provider, logs, monitoring or security stack.
What should I do after using the blacklist checker?
Compare the result with related signals, save useful evidence and follow the linked XGM guide or related tools if you need a wider check.
Read the full Blacklist Checker guide