Network Security
Bulk IP Blacklist & rDNS
Quickly scan multiple IPs or CIDR blocks against major email reputation blacklists (Spamhaus, Barracuda, Spamcop...) to identify blocked status and rDNS.
IP Range / CIDR / IP List
System limits queries to 256 IPs max to prevent upstream DNS rate limits or blocks.
Scanning Blacklists...
Scan Failed
An error occurred while sending the bulk scan request.
Bulk Scan Results
Bulk IP Scan
Clean
All checked IPs are clean.
Listed 0
Clean 0
Total IPs 0
| IP Address | Reverse DNS (rDNS) | Spamhaus ZEN | Barracuda | Spamcop | SORBS | UCEPROTECT | Action |
|---|
How to Use
The Bulk Blacklist Checker allows you to audit IP reputation for large server networks, such as email delivery nodes, marketing clusters, and corporate mail gateways, preventing deliverability issues before they happen.
- • Supports single IP input (1.2.3.4), CIDR networks (103.20.144.0/28), and range notation (1.2.3.4-1.2.3.10).
- • Resolves reverse DNS (rDNS/PTR) records for each IP. Correct PTR configuration is key to establishing mail server trust.
- • Performs real-time lookups on 5 premier lists: Spamhaus ZEN, Barracuda BRBL, Spamcop, SORBS, and UCEPROTECT L1.
- • Capped at 256 IPs per scan run to ensure reliable, high-performance execution.
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