Professional IP Blacklist Checker

IP/CIDR Query

Current blacklist databases: hack.txt (25,918 records)，hackv6.txt (145 records)

Enter IP address to query:

IP Examples:

192.168.1.1 10.0.0.1 2001:db8::1 2a10:9903:201::

Enter CIDR range to query:

CIDR Examples:

192.168.0.0/24 10.0.0.0/16 2001:db8::/32 2a10:9903:201::/48

About CIDR Queries

CIDR queries detect if the entire IP range is in the blacklist, including:

The entire CIDR range is blacklisted
CIDR range is contained within a larger blacklisted range
CIDR range contains individual blacklisted IPs

Matching Blacklist Records:

Querying blacklist database, please wait...

User Guide

IP Address Query

Check if a single IP address is blacklisted
Supports standard IPv4 and IPv6 formats
Supports IPv6 abbreviated formats
Results show matching CIDR ranges

CIDR Range Query

Check if an entire IP range is blacklisted
Supports IPv4 and IPv6 CIDR formats
Detects containment relationships
Shows all matching blacklist records in the range

Blacklist Database Statistics

25,918

IPv4 Blacklist Records

145

IPv6 Blacklist Records

24h

Update Frequency

Automatic file update detection

System Information

Last Query Time 07:49:19

Query Count 0

System Memory 0.5 MB

Run Time 2026-03-08 07:49:19

System Features

Quick Search

Millisecond response time

Responsive Design

Adapts to all devices

Dual Protocol Support

Supports IPv4/IPv6

History

Saves query history

About CIDR Format

CIDR (Classless Inter-Domain Routing) is an IP address allocation method with the format:

IPAddress/Prefix Length

IPv4 Examples:

192.168.1.0/24 - Contains 256 IP addresses
10.0.0.0/16 - Contains 65,536 IP addresses

IPv6 Examples:

2001:db8::/32 - Contains a huge number of IP addresses
2a10:9903:201::/48 - Contains a large number of IP addresses