Email Blacklist Check: IP and Domain Lookup
Enter an IP address, a domain or an email address to check it live against 10 email blacklists, including SpamCop, Barracuda, UCEPROTECT and PSBL, plus a domain blacklist. For a domain, its website and mail server addresses are checked too. Each listing links to the list’s lookup and removal page.
To check the server that sends your email, enter its IP from the Received: header of a message you sent. The result link can be shared.
How a blacklist lookup works
| Step: example for 203.0.113.7 on SpamCop | Answer |
|---|---|
| Reverse the IP and add the list: 7.113.0.203.bl.spamcop.net | DNS name |
| No such name (NXDOMAIN) | not listed |
| An address 127.0.0.2 to 127.0.0.99 | listed |
| 127.0.0.1, 127.255.255.x or an error | no answer |
Example result
203.0.113.7 is listed on 2 of 10 lists: SpamCop and PSBL. Both list addresses that sent mail to their spam traps and remove them on their own after the spam stops, so the first step is to find what sent it: a hacked form or an infected device on that network. Spamhaus is checked separately at check.spamhaus.org.
Keep your sending reputation clean
Send cold email from a mailbox provider or a sending service rather than your own server, authenticate the domain with the SPF, DKIM and DMARC checker, verify lists before you send, and keep volume steady. Check the wording with the email spam checker.
Frequently asked questions
How do I check if my IP or domain is blacklisted?
Enter the IP address of the server that sends your email, or your domain. The checker asks 10 IP blacklists and a domain blacklist live over DNS and shows on which lists the address appears, with a link to each list’s own lookup and delisting page.
How do I find the IP address that sends my email?
Send yourself an email, open the original message or headers and find the first Received: from line added by the receiving server: the address in brackets is your sending IP. With Google Workspace, Microsoft 365 or an email service such as SendGrid, the IPs belong to the provider and they handle listings.
Why is Spamhaus not in the list?
Spamhaus answers only private DNS resolvers and refuses queries that come through public services such as Google Public DNS, which this checker uses. Check Spamhaus on its own site, check.spamhaus.org, which also explains how to request removal.
What should I do if my IP is blacklisted?
Find and fix the cause first: an infected computer, a hacked website form, a bought or old email list, or a sudden jump in volume. Then open the list’s site from the results, read the reason and use its removal form. Many lists, such as SpamCop and PSBL, remove an address on their own after the spam stops.
Does one listing mean my email goes to spam?
Not always. Gmail and Outlook use their own data, and small lists are used by few servers. A listing on one or two lists matters most for email to companies that run their own mail filters. Several listings at once usually mean a real problem with the server or the list you send to.
Is what I check sent anywhere?
Only DNS names are sent, from your browser to Google Public DNS (or Cloudflare if Google does not answer), which passes them to the blacklists, as any mail server does. Nothing is sent to SalesBond.
Related tools: SPF, DKIM and DMARC checker, email spam checker, email format finder. More on sales and running a sales team on the SalesBond blog and the home page.
Official sources
- RFC 5782, DNS Blacklists and Whitelists — reversed IP queries and 127.0.0.x answers.
- Wikipedia, Domain Name System blocklist — how mail servers use DNSBLs.
- SpamCop Blocking List — automatic expiry of listings.
Updated on Nov 6, 2026. This calculator is for information only and is not tax, legal or payroll advice. Ten IP blacklists and one domain blacklist that answer public DNS resolvers are checked live; Spamhaus is not included. An empty answer from a list counts as not listed, a refusal as no answer.
