Free network and server tools

Use these tools without an account or installation. Network tools query from our server; calculators and encoders process input in your browser.

Network

My IP address See the IP used by your current connection Port checker Test an external connection to your own IP

DNS & Domain

Punycode converter Compare a Unicode domain with its xn-- ASCII representation. DNS lookup Inspect A, AAAA, MX, TXT, and other DNS records Reverse DNS Find the PTR hostname for an IP WHOIS lookup Inspect public domain and IP registration data

Web & Security

TLS certificate checker Check certificate dates and verification HTTP headers Inspect response headers and redirects HTTP status checker Check up to five URLs together

IP Info

User-Agent Inspect browser and environment information

Calculators

Subnet calculator (CIDR) Calculate IPv4 ranges and host counts

Dev Tools

Text length & DB size Check length with and without whitespace, UTF-8 bytes, and DB length or integer ranges. Base64 encoder / decoder Convert UTF-8 text and Base64 URL encoder / decoder Encode a URL or a single parameter JSON formatter Format, minify, and check JSON syntax Unix timestamp converter Compare Unix time, KST, and UTC SHA hash generator Calculate hashes for UTF-8 text UUID v4 generator Generate up to 100 UUIDs

Choose the right tool

Similar symptoms can have different causes. Follow these steps to find the part of the connection that needs attention.

Symptom	Check first	Then
The website will not open	DNS lookup	Port checker
The browser shows a security warning	TLS certificate checker	HTTP headers
The URL redirects somewhere else	HTTP status checker	DNS lookup
I cannot reach my server from outside	My IP address	Port checker
I need domain registration details	WHOIS lookup	DNS lookup
I need to divide an IP range	Subnet calculator	My IP address