Free IP & network tools

DNS Leak Test

Find out which DNS servers resolve your queries and whether your VPN leaks.

WebRTC Leak Test

Check if your browser exposes your real IP through WebRTC.

Proxy & VPN Detection

Detect Tor, VPN, proxy and data-center IP addresses.

IP Blacklist Check

Check an IP against major DNS-based spam blacklists (DNSBL).

WHOIS / RDAP Lookup

Registration data for IPs, ASNs and domains.

DNS Lookup

Query A, AAAA, MX, TXT, NS, CNAME, SOA and CAA records.

Reverse DNS Lookup

Find the PTR hostname for an IP address.

CIDR / Subnet Calculator

Network, broadcast, mask and host range for IPv4 and IPv6.

IP Converter

Convert IPs to decimal, hex and binary, and back.

IPv6 Expand & Compress

Expand or compress IPv6 addresses and view their type.

Browser Info & Fingerprint

See your user agent and what your browser reveals.

HTTP Headers Viewer

See the HTTP request headers your browser sends.