Reverse DNS lookup
Find PTR hostnames for an IPv4 or IPv6 address and check whether the address has a published reverse name.
Tools
IP tools
Small, fast, server-rendered utilities for IP addresses, request metadata, and networks.
DNS lookup
Look up common DNS records for a domain, including A, AAAA, MX, TXT, NS, and canonical-name data.
IP in CIDR
Check whether an IPv4 or IPv6 address belongs to a CIDR network.
CIDR calculator
Normalize IPv4 and IPv6 networks, calculate address ranges, total addresses, IPv4 netmasks, and broadcast addresses.
Range to CIDR
Convert a start and end IPv4 or IPv6 address into the smallest covering CIDR blocks.
Subnet splitter
Split a CIDR network into smaller child networks with bounded output for large ranges.
User agent parser
Parse a browser or bot user-agent string into browser, rendering engine, operating-system, mobile, and bot signals.