Blacklist check: is your IP or domain on a list?
Enter the IP or domain your emails are sent from. We query the blocklists one by one and tell you where it shows up, with the official link to ask for removal.
- Free, no sign-up
- 15 lists, each one named
- Free monitor for up to 50 entries
Three steps, a few seconds
Enter an IP or domain
The IP of the sending server, or the domain: in that case we also look at the IPs of its mail servers.
Read the result list by list
For each list: clean, listed or could not be queried. If you are listed, you get the link to the official removal page.
Start the monitor
Up to 50 entries, free. We check them every 12 hours and write to you only when something changes.
We tell you when something changes
- Up to 50 entries between IPs and domains, free.
- A check every 12 hours, twice a day, with nothing for you to do.
- An email only when something changes: an entry gets onto a list or comes off one.
- A short summary every 30 days.
- Stop it anytime from the link in every email. No account to create.
The 15 lists we query
11 for IP addresses and 4 for domains.
Are you a developer? The check is also available as a free API with no key: one request, a JSON answer, on 9 of these lists.
UCEPROTECT copyright notice
Copyright © 2001-2021 UCEPROTECT-Network http://www.uceprotect.net. Permission to use, copy, modify, and/or distribute this data for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE DATA IS PROVIDED 'AS IS' AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS DATA INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS DATA.
Frequently asked questions
What is an email blacklist?
It is a public list of IP addresses or domains that spam has been sent from. Many mailbox providers look it up before accepting an email: if you are on it, your messages may be refused or land in the junk folder.
Which lists do you check?
We query 15 lists: 11 for IP addresses and 4 for domains, all named on this page. Below them you also find the lists we do not query, such as Spamhaus and Barracuda, with the link to the check on their official site.
I am on a list: what do I do?
Open the list’s official page from the link next to the result: the reason is there. Fix the cause first, for example a compromised mailbox or sending to old addresses, then ask for removal from that same page. Many lists drop the entry on their own after a few days without new reports.
How does the free monitor work?
You leave your company email and up to 50 entries between IPs and domains, then confirm from the link we send. We check them every 12 hours and write to you only when something changes, plus a summary every 30 days. There is no account to create and every email has the link to stop it.
If I am on no list, will my emails arrive?
Not necessarily. Lists are one of the signals mailbox providers look at, together with SPF, DKIM, DMARC, the content and how recipients treat your emails. To see how a message looks to a spam filter, try the email spam test.
Why does a list show as could not be queried?
It happens when the list does not answer in time or refuses the query. In that case we say neither clean nor listed: try again in a few minutes, or use the link to the official site.
More free tools
Email spam test
How your email scores: a 0 to 10 mark and what to fix.
OpenEmail DNS checker
SPF, DKIM, DMARC and MX at once, with the report by email.
OpenSPF checker
A single record, its ending, DNS lookups under the limit of 10.
OpenDMARC checker
Policy, reports address, inherited record.
OpenEmail header analyzer
SPF, DKIM and DMARC results and the server route.
OpenFree DNS check API
JSON, no key, CORS enabled.
OpenDo your website or app emails still leave from the hosting server?
SMTP Senpai is the MailSenpai SMTP relay: it signs your emails with DKIM on your own domain, gives you the DNS records to publish and checks them for you. Sending servers in the EU.