Network & Internet
My IP, DNS, WHOIS, speed test, subnets, Wi-Fi QR and more. These tools are free, need no account, and come with simple step-by-step instructions.
- What Is My IP Address?See your public IPv4 and IPv6 address, country and internet provider instantly.
- IP Address Lookup (Owner & Location)Find who owns any IP address or website, its country, range, hostname and abuse contact.
- DNS Lookup (A, MX, TXT, CNAME…)Check any domain’s DNS records and compare Cloudflare vs Google to see if changes have spread.
- Email Setup Checker (MX, SPF, DKIM, DMARC)Check if a domain is set up to receive email and protect against fake senders.
- Domain WHOIS Lookup (RDAP)See a domain’s registrar, registration and expiry dates, status and name servers.
- Internet Speed TestMeasure your download, upload, ping and jitter in about 20 seconds.
- WebRTC Leak Test (VPN Check)Check if your browser reveals your real IP through WebRTC while using a VPN.
- Ping & Latency TestMeasure how fast your connection responds to Cloudflare, Google and ToolsKo.
- Is This Website Down? (From My Connection)Check whether a website opens from your internet and whether its DNS works.
- What Is My Browser? (Device Info)See your browser, version, operating system, screen size, language and time zone.
- Wi-Fi QR Code GeneratorMake a QR code (and printable card) so guests can join your Wi-Fi by scanning.
- Subnet Calculator (CIDR / IPv4)Network address, broadcast, mask, usable hosts and IP range from an address like 192.168.1.10/24.
- IP Range to CIDR ConverterConvert a start–end IP range into the smallest list of CIDR blocks (and back).
- IPv4 Address Converter (Decimal, Hex, Binary)Convert an IPv4 address between dotted, decimal number, hexadecimal and binary forms.
- IPv6 Expander & CompressorShow IPv6 addresses in full (expanded) and shortest (compressed) form, and what type they are.
- IP Address Validator & Type CheckerCheck if IPs are valid and whether each is public, private, loopback, CGNAT or reserved.
- MAC Address FormatterReformat MAC addresses (colon, dash, dot, plain) and see if they are unicast/multicast or randomized.
- Random MAC Address GeneratorGenerate random, valid, locally administered MAC addresses for testing and virtual machines.
- Port Number Lookup (Common Ports)What runs on port 22, 443, 3389…? Search common TCP/UDP port numbers and services.
- User Agent ParserPaste a user agent string to see the browser, version, operating system, device and engine.
- Punycode Converter (IDN Domains)Convert international domain names like café.com to xn-- form and back.
- Bandwidth Calculator (Streaming & Website)How much internet speed a live stream needs, or how much data a website uses per month.