Domain Parser

The Domain Parser takes a hostname or a full URL and breaks it down into the parts developers actually need: the subdomain, the registrable domain, the public suffix (TLD), the second-level label and any port.

Paste something like "https://api.shop.example.co.uk:8443/path" and it pulls out api.shop as the subdomain, example.co.uk as the domain, and co.uk as the suffix — getting the multi-label suffix right where a naive split on the last dot would fail.

Knowing the true registrable domain matters for cookies, CORS, certificate scoping, analytics grouping and security checks, and it is trickier than it looks because suffixes like co.uk, com.au and com.br span two labels.

This tool recognises a curated list of those common multi-label suffixes and falls back to the final label otherwise.

It also flags the cases that often trip code up: IPv4 and IPv6 address literals, localhost, and internationalised domains encoded as punycode ("xn--").

Input is forgiving — it accepts bare hosts, full URLs, userinfo and ports — and the structured result is shown both as a labelled table and as copyable JSON.

Everything is parsed locally in your browser, so the hostnames you test never leave your machine, and the tool works offline once loaded.