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IP Blacklist Check

Check and show whether your IP appears on common DNS blocklists

What to do next after a blacklist check

Blacklist results are only the first signal. Validate DNS, ownership, and reputation context before requesting delisting.

1Next step
Email signal

Check reverse DNS (PTR)

A broken or suspicious PTR record can contribute to mail delivery issues and blacklist reputation problems.

Run reverse DNS
2Next step
DNS records

Validate DNS records

Review A, MX, and TXT records to confirm your mail/domain setup is consistent before requesting delisting.

Run DNS lookup
3Next step
Ownership

Check WHOIS / RDAP ownership

Confirm registrar or allocation ownership so you know whether to contact your ISP, host, or provider.

Run WHOIS/RDAP
4Next step
Provider context

Check ASN and network provider

Shared hosting and provider ASNs can affect IP reputation. ASN context helps with support and abuse tickets.

Check ASN

How to show IP blacklist status (and what means)

This tool shows whether an IPv4 address appears on common DNS-based blacklists (). If you searched for something like "blacklist show", the goal is the same: show the current blacklist status of an IP and identify which lists report it.

Blacklist checks work by reversing the IP and querying known DNSBL zones. Listings can affect email delivery, sender reputation, and sometimes web abuse filtering.

Related topics

Quick tips

  • A blacklist checker shows status, but you still need to investigate the root cause.
  • Use multiple lists to confirm a listing.
  • Check your reverse DNS (PTR) record for anomalies.
  • If listed, contact your ISP or hosting provider.

Related Articles

What is a DNSBL?6 min read • January 9, 2026Reverse DNS Lookup: PTR Records Explained7 min read • January 9, 2026PTR Record Explained (Reverse DNS in Plain English)6 min read • January 9, 2026

Frequently asked questions

What is an IP blacklist?
An IP blacklist is a list of IP addresses associated with spam or abusive activity. Email providers and security tools use them to block or flag traffic.
Why is my IP blacklisted?
Common causes include compromised devices, spam from a shared IP, or poor reputation from a hosting provider or ISP.
How do I get delisted?
Identify the list, fix the root cause, then request delisting from the blacklist provider or via your ISP/hosting provider.
How do I show if my IP is blacklisted?
Enter your public IPv4 address into the checker and review the returned blacklist status. The tool shows which DNSBLs list the IP and which do not.
How do I use an IP address blacklist checker?
Enter your public IPv4, review which DNSBLs list it, fix the underlying abuse or mail setup issue, then request delisting where needed.
Do blacklists affect websites or only email?
Most blacklists are used for email, but some security systems use them for web traffic and abuse prevention too.