🌐Network & Infrastructure
Online network tools: analyze and calculate DNS, IP, SSL, subnets and HTTP – free in your browser, no installation.
18 free tools – right in your browser, no sign-up.
Subnet Calculator (CIDR)
Calculate IPv4 subnet mask, network address, broadcast and host range
VLSM Subnetting
Automatic subnet plan with variable masks (VLSM), naming and print function
Cron Expression Generator
Visually create and validate cron expressions
QR Code Generator
Generate QR codes for text, URLs, WiFi and more
DNS Lookup
A · AAAA · MX · TXT · NS · CNAME · SOA · CAA via Cloudflare DoH
DNS Multi-Resolver
Query DNS records from 6 public resolvers and check consistency – Guest: 1 request/minute
IP Geolocation
Look up location, ISP and metadata of an IP address
IP Lookup (ASN)
Resolve IPv4 address to ASN, country and IP range
My IP
Show your currently visible IP address and proxy headers
SSL Certificate Checker
Check SSL/TLS certificate details, expiry date and chain
SSL Certificate Analyzer
Show full SSL certificate chain, key details, SANs and fingerprints
HTTP Request Tester
Send HTTP requests directly in the browser and analyze the response
MAC Vendor Lookup
IEEE OUI: Identify manufacturer from MAC address
DMARC / SPF Checker
Query and analyze DMARC and SPF records of a domain
Email Header Analyzer
Analyze email headers: visualize the delivery path, delays and SPF/DKIM/DMARC results
cURL Builder
Visually compose HTTP requests and export them as a cURL command or code (fetch, Axios, Python, PowerShell)
IPv6 Converter
Expand, compress and convert IPv6 addresses to decimal
QR Code Decoder
Read QR codes from an image, screenshot or camera – nothing is uploaded