Network & IP Tools
Diagnose connectivity, calculate subnets, and inspect any IP address.
ASN Lookup & Prefix List
Lookup Autonomous System Numbers (ASN), IP prefixes, and network ownership details.
CIDR Calculator
Convert between CIDR notation and IP ranges, in either direction.
HTTP Header Checker
See every response header, the full redirect chain, and where the time goes.
HTTP Status Code Reference
Lookup and instantly explain any HTTP response status code.
IP Address Lookup
Find the country, network owner and reverse DNS for any IP address.
IP Converter
Convert IP addresses between decimal, binary, hex, and dotted-decimal formats.
IPv6 Subnet Calculator
Calculate IPv6 subnets, network prefixes, and address ranges.
MAC Address Lookup
Find the vendor and manufacturer of any MAC address or OUI.
Online Traceroute
Trace the route packets take across the internet to reach your destination host.
Open Port Checker
See which TCP ports on a server are reachable from the internet.
Ping Test
Ping an IP address or hostname from multiple global locations.
Redirect Checker
Trace every hop a URL redirects through, with status codes and timings.
Subnet Calculator
Work out network address, broadcast, usable host range and mask from any CIDR.
Website Down Checker
Check if a website is down for everyone or just you.
What Is My IP
See your public IP address, network operator and what your browser reveals.