IP Blacklist Checker
Enter an IP address or a domain to see whether it appears on well-known spam and abuse blocklists, what each listing means and which lists could not be checked.
Dieser Inhalt ist auf Englisch.
Durchgerechnete Beispiele
Checking a domain on blocklists
example.com typed into the box
(Illustrative) Three web addresses, three mail server addresses and the domain itself checked against the blocklists. No listings found, and one list shown as could not check.
A list that does not answer properly is reported as could not check, never as clear.
Address on a blocklist
203.0.113.25 typed into the box
(Illustrative) Listed on one blocklist, with the list name and a link to its removal process.
Listing on one list does not always mean mail is blocked, but it is worth checking the list named.
Über IP Blacklist Checker
An IP blacklist, more properly called a blocklist, is a public list of addresses that have been seen sending spam or taking part in abuse. Mail servers and firewalls look addresses up on these lists and may reject or filter messages from any address they find. If your emails suddenly bounce or land in spam, a listing is one of the first things worth ruling out. This tool checks an address against a wide set of well-known lists and shows the result for each one separately. The results are a snapshot taken at the moment you run the check, so run it again after any change to see whether a listing has cleared.
Enter an IPv4 address, or a domain name and we will find its web addresses and mail servers and check up to three of each, plus the domain itself against domain blocklists. Every list is tested before it is used, because some large lists refuse queries from shared servers. When a list cannot be queried reliably it is shown as could not check, never as clear, so the summary only claims what was actually tested. Each listing comes with its return code and a plain explanation. The report is split by address, so you can tell at once whether the problem sits with your website, your mail servers or only one of them.
So verwenden Sie IP Blacklist Checker
- Type an IPv4 address or a domain name into the box.
- Select Check blocklists and wait a few seconds while each list is queried.
- Read the verdict and summary at the top, then open the per-list results.
- Note any lists marked could not check, since a clear result does not cover those.
- Download the CSV if you need to share the findings.
Typische Einsatzzwecke
- Finding out why outgoing email is being rejected or sent to spam
- Checking a new server or hosting address before sending mail from it
- Reviewing the mail servers of a domain you have just taken over
- Confirming a listing has cleared after you fixed the cause
- Vetting an address that keeps appearing in your logs
Häufige Fragen
What does it mean if my IP is listed?
It means at least one list has recorded the address as a source of spam or abuse, or as a type of address that should not send mail directly. Receivers that use that list may reject or filter your mail. Check which list flagged it, read the meaning of the return code and fix the underlying cause before asking for removal.
Why do some lists show as could not check?
Several large lists refuse queries that come from shared or public servers, and some do not answer in time. Rather than guess, we test each list first and mark it could not check when the answer cannot be trusted. A clear result therefore only covers the lists that were actually queried.
What is the difference between a policy listing and a reputation listing?
A reputation listing means the address was seen misbehaving, for example sending spam. A policy listing means the address belongs to a range, such as a home broadband or dynamic range, that should send mail through a provider instead. Policy listings are common and are not a sign of wrongdoing.
How do I get removed from a blocklist?
Fix the cause first, such as a compromised account, an open relay or a forgotten mail script. Then follow the removal process on the list operator's own website. Many lists remove addresses automatically after a quiet period, and asking to be removed before the problem is fixed usually leads to a repeat listing.
Can I check an IPv6 address?
Not at the moment. Mail blocklists are mostly built around IPv4 addresses, so this tool accepts an IPv4 address or a domain name. For a domain we check its IPv4 web and mail server addresses. Private and reserved addresses, such as those starting with 10 or 192.168, cannot be checked.
Does being clear mean my mail will be delivered?
No. Blocklists are only one signal. Delivery also depends on SPF, DKIM and DMARC records, reverse DNS, the content of your messages and how people respond to them. Use the email records checker alongside this tool for a fuller picture of your sending setup.