Network Tools
A free toolbox for everyday networking tasks — subnet math, MAC vendor lookup, port reference, DNS records, HTTP headers, Wi-Fi QR codes and password generation. Everything runs in your browser or on our server, no signup.
Subnet calculator
Calculate subnet mask, network and broadcast address, host range and CIDR for any IPv4 address. Works for /24, /16, /8 and every prefix between 0 and 32 — handy when planning a TP-Link, Asus, Netgear or MikroTik LAN.
MAC vendor lookup
Identify the manufacturer of any device from its MAC address. Powered by the IEEE OUI database with 39,000+ registered vendors including Cisco, Apple, Samsung, TP-Link, Huawei, Xiaomi, Hikvision and Ubiquiti.
Port reference
Look up any TCP or UDP port number — 22 (SSH), 80 (HTTP), 443 (HTTPS), 3389 (RDP), 8080, 25565 and 1,500+ IANA-registered services. Find which application runs on a port before opening it on your router.
Wi-Fi QR generator
Generate a Wi-Fi QR code from your SSID and password. iPhone and Android scan it to connect instantly — no typing the WPA2/WPA3 key from your TP-Link, Huawei, Asus or Zyxel modem.
Password generator
Create cryptographically random passwords for your router admin panel, Wi-Fi network, IP camera or IoT device. Adjustable length (8–64), uppercase, numbers, symbols — generated entirely in your browser.
DNS lookup
Query A, AAAA, MX, NS, TXT and CNAME records for any domain in real time. No third-party API — direct DNS lookup against Google 8.8.8.8 and Cloudflare 1.1.1.1.
HTTP headers
Inspect any URL's response headers and security policy. Check HSTS, Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, Referrer-Policy plus Server, Content-Type, Cache-Control in one click.
IP security check
Instantly see your public IP address, location, ISP, and connection details. All information is detected automatically from your connection.
Password strength
Test how strong your password is. We check length, complexity, common patterns, and estimate how long it would take to crack.