DNSBL Lookup
Check if an IP address or domain is listed on the vspam.org blocklist. Free self-service tool for mail administrators.
How to query via DNS
You can query the vspam.org DNSBL directly using standard DNS tools. A TXT response means the entry is listed.
dig 1.2.0.192.dnsbl.vspam.org TXT
dig example.com.dnsbl.vspam.org TXT
The DNSBL zone is dnsbl.vspam.org. Configure it as an RBL in Postfix via reject_rbl_client dnsbl.vspam.org in smtpd_recipient_restrictions. Integration guide
About the DNSBL lookup tool
The vspam.org DNSBL lookup lets mail administrators check whether an IP address or domain is currently listed on the vspam.org blocklist. Results are returned in real-time from the live DNSBL zone served by PowerDNS.
What you can look up
- IPv4 and IPv6 addresses — check whether a sending IP is listed for phishing, spam, or botnet activity.
- Domain names — check whether a domain has been reported for hosting phishing pages or sending spam.
How listings work
An IP or domain is added to the DNSBL when community reports reach the confirmation threshold through trust-weighted voting. Listings include a reason code, the original report date, and the number of confirming votes. Listings expire automatically after 30 days of inactivity, or can be removed via the delisting request process.
Programmatic lookups
For automated checks, query the DNSBL zone directly via DNS ( dig +short 1.0.168.192.dnsbl.vspam.org) or use the REST API endpoint GET /api/v1/ioc/check. See the integration guides for Postfix, Exim, rspamd, and SpamAssassin configuration.