IP & Domain Blacklist / Spam Reputation Check

You are viewing a shared scan result.
90+ DNSBL/URIBL check — Spamhaus, SpamCop, Barracuda, SORBS, UCEPROTECT, SURBL, URIBL and many more. When you enter a domain name, MX records are resolved automatically.

Domain Analysis:

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Querying your IP against 28 global DNSBLs.

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Enter your IP address or domain name and click Fix Mail Delivery Issues.

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DNS-Based Blackhole Lists (DNSBL)

DNSBLs are distributed blacklists that contain IP addresses where malicious activity such as spam, phishing, botnets, or open proxies has been detected. Mail servers, web services, and firewalls check incoming traffic against these lists to make automated decisions.

Categories

  • Spam — IPs reported for sending spam directly (Spamhaus SBL, SpamCop, Barracuda).
  • Exploits — bot/zombie/open proxy behavior (Spamhaus XBL, SORBS Zombie).
  • Policy — end-user/dynamic IPs not permitted to send mail (Spamhaus PBL, SORBS DUL, NoPtr).
  • Proxy — open SMTP relay or HTTP/SOCKS proxy.
  • Abuse — backscatter, bounce-back spam.
  • Reputation — reputation-based (Mailspike Z, HostKarma).

Am I blacklisted on one or two lists?

Appearing on authoritative lists like Spamhaus, SpamCop, or Barracuda will cause mail delivery issues. Aggressive policy lists such as UCEPROTECT L2/L3 and s5h.net can block an entire ASN, so being on one of them alone is not cause for panic. To get delisted, follow the relevant "Delist" link.

Blacklist Check — FAQ

Quick answers to the most common questions about this tool.

What is a DNSBL?

DNS-based Blackhole List — a real-time database that mail servers query to decide whether to accept email from a given IP. Being listed makes your messages bounce or land in spam.

My IP is on a blacklist. What do I do?

Find which list flagged you, visit that operator's removal/de-listing page and follow their procedure. Most lists let you self-remove once, after which you must fix the underlying cause.

Why is my domain on a URIBL list?

URIBLs flag domains found in spam-payload URLs. Common causes include compromised mailboxes, neglected forms or malware that scraped your address. Fix the source first, then request removal.

What is FCrDNS?

Forward-Confirmed Reverse DNS. Your IP's PTR record must point to a hostname whose A record points back to that IP. Mail servers reject senders failing FCrDNS.