Free Brand & Handle Checker

“GOOD NAME.
IS IT YOURS?”

Your next venture starts with a name. Check .co.uk, .uk and .com domains live with official registries, and test handle availability across 14 major social networks.

100% free standalone utility. No email, registration, card or payment required.

Your name. EVERYWHERE
IT MATTERS.

.co.uk GitHub Instagram YouTube TikTok LinkedIn X Facebook

“LET’S SEE WHAT’S FREE.”

Checking target: your name · Just now

Primary Domains (Official Registry RDAP)

Primary UK Domain Checking…

name.co.uk

Official Nominet RDAP query.

Official UK Registry Nominet (.co.uk)

Direct UK Extension Checking…

name.uk

Official Nominet RDAP query.

Direct Country TLD Nominet (.uk)

Global Commercial Checking…

name.com

Official Verisign RDAP query.

Global Registry Verisign (.com)

Alternative Username Ideas

If your primary handle is already registered, click any variation below to check its availability across all domains and platforms:

Point-in-time check evidence: Results are obtained directly from official registries (Nominet, Verisign) and documented public APIs (GitHub, Bluesky ATProto).

Platform confirmation notice: Social platforms with strict login barriers and anti-scraping policies (e.g. Instagram, Facebook, TikTok, X, LinkedIn) are designated Unable to verify with direct manual check links. Automated results provide preliminary guidance; final availability and trademark clearance must always be confirmed directly on the respective platform and with official trademark registries (such as the UK IPO).

“HONEST SIGNALS.
ZERO GUESSWORK.”

Most handle checkers guess or produce fake "Available!" badges that break on login walls. Circle37 provides direct, authoritative signals without pretending what cannot be verified.

01 · Official Registry RDAP

We query the authoritative registry operators directly (.co.uk and .uk via Nominet, .com via Verisign) using standard RDAP protocols. No middleman registrar markups or cached DNS.

02 · Strict Platform-Specific Format Validation

Every platform enforces different handle syntax — length limits, underscores vs hyphens, and reserved prefixes. We validate each platform's rules before querying to catch invalid formats immediately.

03 · Honest Verification Status

When platforms restrict automated lookups with anti-bot gates (like Instagram or LinkedIn), we state Unable to verify with a 1-click direct link, rather than misleading you with false negatives.

“FREQUENTLY
ANSWERED.”

Everything you need to know about handle checks, domain registration and trademark integrity.

Why do some social networks say "Unable to verify"?

Platforms like Instagram, Facebook, TikTok, X and LinkedIn restrict automated checks with login walls and anti-bot measures. Rather than displaying inaccurate guesses, Circle37 marks them as "Unable to verify" and provides a direct link to check the handle manually in one click.

Does "Possibly available" guarantee I can register it?

It means the public registry or API confirms no active account exists under that handle at the exact moment of checking. However, platforms may reserve certain brand names, dictionary words, or previously deleted handles that cannot be newly claimed.

How are business name suffixes handled?

When you type a name like "Acme Plumbing Ltd" or "Nova Labs Co", we strip common entity suffixes (Ltd, LLC, Inc, Co) to check the clean brand handle, while also giving you a 1-click option to test the full legal name.

Does checking or registering protect a trademark?

No. This tool checks domain and social handle registration status. It does not search registered trademarks or confer legal rights. Always check the UK Intellectual Property Office (UK IPO) register before committing to a commercial name.

“GOOD NAME.IS IT YOURS?”