Network Tools

Lightweight tools for quick network checks. Results are designed to be copy-ready and easy to interpret.

Tools in this category

Domain Availability Checker

Check domain DNS status and get availability guidance (approximation).

IP Subnet Calculator

Calculate IPv4 network details from an IP address and CIDR prefix.

What's My IP?

Find your public IPv4/IPv6 address (via trusted third-party IP endpoints).

WHOIS / RDAP Lookup

Look up RDAP data for domains or IPs and view registrar/registration details (when available).

Guide: IP, subnets, and WHOIS/RDAP

Learn what your public IP represents, how subnet masks define networks, and why RDAP is replacing WHOIS. This guide also covers common lookup failures and redirects.

Read the network tools guide

Common tasks (fast shortcuts)

Check your public IP

Useful for VPN troubleshooting, remote access, and support tickets.

What’s My IP?

Calculate a CIDR subnet

Derive mask, broadcast, and usable host range from an IP + prefix.

IP Subnet Calculator

Look up registration details

Use RDAP/WHOIS to inspect registrar, status codes, and contacts (when available).

WHOIS / RDAP Lookup

Check domain availability

Quick DNS checks before you search registrars and marketplaces.

Domain Availability

Interpretation tips

Public vs private IP: private ranges (like 192.168.x.x) are used inside networks and aren’t reachable directly from the internet.
CIDR prefixes: smaller prefixes mean larger networks (e.g., /16 is larger than /24).
WHOIS vs RDAP: RDAP is the modern protocol. Some registries redact fields for privacy or policy reasons.
Availability checks: DNS results are a clue, but the registrar is the source of truth for registration.

Need deeper context? See the Network Tools Guide.

Accuracy note

DNS status is a strong signal but not a guarantee of registration availability. Always confirm at a registrar.